Igor Canadi
11 years ago
commit
62d2b92075
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// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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#ifndef LIBHDFS_HDFS_H |
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#define LIBHDFS_HDFS_H |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <fcntl.h> |
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#include <stdio.h> |
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#include <stdint.h> |
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#include <string.h> |
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#include <stdlib.h> |
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#include <time.h> |
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#include <errno.h> |
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#include <jni.h> |
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#ifndef O_RDONLY |
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#define O_RDONLY 1 |
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#endif |
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#ifndef O_WRONLY |
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#define O_WRONLY 2 |
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#endif |
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#ifndef EINTERNAL |
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#define EINTERNAL 255 |
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#endif |
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/** All APIs set errno to meaningful values */ |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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/**
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* Some utility decls used in libhdfs. |
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*/ |
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typedef int32_t tSize; /// size of data for read/write io ops
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typedef time_t tTime; /// time type in seconds
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typedef int64_t tOffset;/// offset within the file
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typedef uint16_t tPort; /// port
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typedef enum tObjectKind { |
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kObjectKindFile = 'F', |
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kObjectKindDirectory = 'D', |
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} tObjectKind; |
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/**
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* The C reflection of org.apache.org.hadoop.FileSystem . |
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*/ |
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typedef void* hdfsFS; |
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/**
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* The C equivalent of org.apache.org.hadoop.FSData(Input|Output)Stream . |
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*/ |
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enum hdfsStreamType |
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{ |
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UNINITIALIZED = 0, |
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INPUT = 1, |
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OUTPUT = 2, |
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}; |
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/**
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* The 'file-handle' to a file in hdfs. |
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*/ |
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struct hdfsFile_internal { |
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void* file; |
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enum hdfsStreamType type; |
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}; |
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typedef struct hdfsFile_internal* hdfsFile; |
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/**
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* hdfsConnectAsUser - Connect to a hdfs file system as a specific user |
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* Connect to the hdfs. |
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* @param host A string containing either a host name, or an ip address |
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* of the namenode of a hdfs cluster. 'host' should be passed as NULL if |
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* you want to connect to local filesystem. 'host' should be passed as |
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* 'default' (and port as 0) to used the 'configured' filesystem |
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* (core-site/core-default.xml). |
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* @param port The port on which the server is listening. |
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* @param user the user name (this is hadoop domain user). Or NULL is equivelant to hhdfsConnect(host, port) |
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* @param groups the groups (these are hadoop domain groups) |
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* @return Returns a handle to the filesystem or NULL on error. |
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*/ |
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hdfsFS hdfsConnectAsUser(const char* host, tPort port, const char *user , const char *groups[], int groups_size ); |
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/**
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* hdfsConnect - Connect to a hdfs file system. |
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* Connect to the hdfs. |
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* @param host A string containing either a host name, or an ip address |
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* of the namenode of a hdfs cluster. 'host' should be passed as NULL if |
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* you want to connect to local filesystem. 'host' should be passed as |
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* 'default' (and port as 0) to used the 'configured' filesystem |
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* (core-site/core-default.xml). |
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* @param port The port on which the server is listening. |
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* @return Returns a handle to the filesystem or NULL on error. |
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*/ |
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hdfsFS hdfsConnect(const char* host, tPort port); |
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/**
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* This are the same as hdfsConnectAsUser except that every invocation returns a new FileSystem handle. |
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* Applications should call a hdfsDisconnect for every call to hdfsConnectAsUserNewInstance. |
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*/ |
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hdfsFS hdfsConnectAsUserNewInstance(const char* host, tPort port, const char *user , const char *groups[], int groups_size ); |
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hdfsFS hdfsConnectNewInstance(const char* host, tPort port); |
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hdfsFS hdfsConnectPath(const char* uri); |
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/**
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* hdfsDisconnect - Disconnect from the hdfs file system. |
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* Disconnect from hdfs. |
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* @param fs The configured filesystem handle. |
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* @return Returns 0 on success, -1 on error.
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*/ |
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int hdfsDisconnect(hdfsFS fs); |
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/**
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* hdfsOpenFile - Open a hdfs file in given mode. |
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* @param fs The configured filesystem handle. |
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* @param path The full path to the file. |
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* @param flags - an | of bits/fcntl.h file flags - supported flags are O_RDONLY, O_WRONLY (meaning create or overwrite i.e., implies O_TRUNCAT),
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* O_WRONLY|O_APPEND. Other flags are generally ignored other than (O_RDWR || (O_EXCL & O_CREAT)) which return NULL and set errno equal ENOTSUP. |
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* @param bufferSize Size of buffer for read/write - pass 0 if you want |
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* to use the default configured values. |
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* @param replication Block replication - pass 0 if you want to use |
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* the default configured values. |
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* @param blocksize Size of block - pass 0 if you want to use the |
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* default configured values. |
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* @return Returns the handle to the open file or NULL on error. |
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*/ |
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hdfsFile hdfsOpenFile(hdfsFS fs, const char* path, int flags, |
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int bufferSize, short replication, tSize blocksize); |
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/**
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* hdfsCloseFile - Close an open file.
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* @param fs The configured filesystem handle. |
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* @param file The file handle. |
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* @return Returns 0 on success, -1 on error.
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*/ |
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int hdfsCloseFile(hdfsFS fs, hdfsFile file); |
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/**
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* hdfsExists - Checks if a given path exsits on the filesystem
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* @param fs The configured filesystem handle. |
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* @param path The path to look for |
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* @return Returns 0 on exists, 1 on non-exists, -1/-2 on error.
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*/ |
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int hdfsExists(hdfsFS fs, const char *path); |
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/**
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* hdfsSeek - Seek to given offset in file.
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* This works only for files opened in read-only mode.
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* @param fs The configured filesystem handle. |
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* @param file The file handle. |
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* @param desiredPos Offset into the file to seek into. |
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* @return Returns 0 on success, -1 on error.
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*/ |
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int hdfsSeek(hdfsFS fs, hdfsFile file, tOffset desiredPos);
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/**
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* hdfsTell - Get the current offset in the file, in bytes. |
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* @param fs The configured filesystem handle. |
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* @param file The file handle. |
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* @return Current offset, -1 on error. |
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*/ |
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tOffset hdfsTell(hdfsFS fs, hdfsFile file); |
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/**
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* hdfsRead - Read data from an open file. |
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* @param fs The configured filesystem handle. |
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* @param file The file handle. |
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* @param buffer The buffer to copy read bytes into. |
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* @param length The length of the buffer. |
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* @return Returns the number of bytes actually read, possibly less |
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* than than length;-1 on error. |
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*/ |
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tSize hdfsRead(hdfsFS fs, hdfsFile file, void* buffer, tSize length); |
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/**
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* hdfsPread - Positional read of data from an open file. |
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* @param fs The configured filesystem handle. |
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* @param file The file handle. |
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* @param position Position from which to read |
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* @param buffer The buffer to copy read bytes into. |
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* @param length The length of the buffer. |
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* @return Returns the number of bytes actually read, possibly less than |
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* than length;-1 on error. |
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*/ |
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tSize hdfsPread(hdfsFS fs, hdfsFile file, tOffset position, |
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void* buffer, tSize length); |
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/**
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* hdfsWrite - Write data into an open file. |
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* @param fs The configured filesystem handle. |
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* @param file The file handle. |
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* @param buffer The data. |
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* @param length The no. of bytes to write.
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* @return Returns the number of bytes written, -1 on error. |
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*/ |
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tSize hdfsWrite(hdfsFS fs, hdfsFile file, const void* buffer, |
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tSize length); |
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/**
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* hdfsWrite - Flush the data.
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* @param fs The configured filesystem handle. |
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* @param file The file handle. |
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* @return Returns 0 on success, -1 on error.
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*/ |
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int hdfsFlush(hdfsFS fs, hdfsFile file); |
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/**
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* hdfsSync - Sync the data to persistent store. |
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* @param fs The configured filesystem handle. |
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* @param file The file handle. |
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* @return Returns 0 on success, -1 on error. |
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*/ |
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int hdfsSync(hdfsFS fs, hdfsFile file); |
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/**
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* hdfsGetNumReplicasInPipeline - get number of remaining replicas in
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* pipeline |
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* @param fs The configured filesystem handle |
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* @param file the file handle |
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* @return returns the # of datanodes in the write pipeline; -1 on error |
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*/ |
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int hdfsGetNumCurrentReplicas(hdfsFS, hdfsFile file); |
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/**
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* hdfsAvailable - Number of bytes that can be read from this |
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* input stream without blocking. |
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* @param fs The configured filesystem handle. |
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* @param file The file handle. |
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* @return Returns available bytes; -1 on error.
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*/ |
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int hdfsAvailable(hdfsFS fs, hdfsFile file); |
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/**
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* hdfsCopy - Copy file from one filesystem to another. |
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* @param srcFS The handle to source filesystem. |
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* @param src The path of source file.
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* @param dstFS The handle to destination filesystem. |
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* @param dst The path of destination file.
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* @return Returns 0 on success, -1 on error.
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*/ |
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int hdfsCopy(hdfsFS srcFS, const char* src, hdfsFS dstFS, const char* dst); |
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/**
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* hdfsMove - Move file from one filesystem to another. |
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* @param srcFS The handle to source filesystem. |
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* @param src The path of source file.
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* @param dstFS The handle to destination filesystem. |
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* @param dst The path of destination file.
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* @return Returns 0 on success, -1 on error.
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*/ |
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int hdfsMove(hdfsFS srcFS, const char* src, hdfsFS dstFS, const char* dst); |
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/**
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* hdfsDelete - Delete file.
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* @param fs The configured filesystem handle. |
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* @param path The path of the file.
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* @return Returns 0 on success, -1 on error.
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*/ |
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int hdfsDelete(hdfsFS fs, const char* path); |
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/**
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* hdfsRename - Rename file.
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* @param fs The configured filesystem handle. |
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* @param oldPath The path of the source file.
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* @param newPath The path of the destination file.
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* @return Returns 0 on success, -1 on error.
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*/ |
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int hdfsRename(hdfsFS fs, const char* oldPath, const char* newPath); |
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/**
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* hdfsGetWorkingDirectory - Get the current working directory for |
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* the given filesystem. |
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* @param fs The configured filesystem handle. |
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* @param buffer The user-buffer to copy path of cwd into.
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* @param bufferSize The length of user-buffer. |
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* @return Returns buffer, NULL on error. |
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*/ |
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char* hdfsGetWorkingDirectory(hdfsFS fs, char *buffer, size_t bufferSize); |
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/**
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* hdfsSetWorkingDirectory - Set the working directory. All relative |
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* paths will be resolved relative to it. |
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* @param fs The configured filesystem handle. |
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* @param path The path of the new 'cwd'.
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* @return Returns 0 on success, -1 on error.
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*/ |
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int hdfsSetWorkingDirectory(hdfsFS fs, const char* path); |
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/**
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* hdfsCreateDirectory - Make the given file and all non-existent |
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* parents into directories. |
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* @param fs The configured filesystem handle. |
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* @param path The path of the directory.
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* @return Returns 0 on success, -1 on error.
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*/ |
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int hdfsCreateDirectory(hdfsFS fs, const char* path); |
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/**
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* hdfsSetReplication - Set the replication of the specified |
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* file to the supplied value |
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* @param fs The configured filesystem handle. |
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* @param path The path of the file.
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* @return Returns 0 on success, -1 on error.
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*/ |
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int hdfsSetReplication(hdfsFS fs, const char* path, int16_t replication); |
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/**
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* hdfsFileInfo - Information about a file/directory. |
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*/ |
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typedef struct { |
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tObjectKind mKind; /* file or directory */ |
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char *mName; /* the name of the file */ |
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tTime mLastMod; /* the last modification time for the file in seconds */ |
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tOffset mSize; /* the size of the file in bytes */ |
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short mReplication; /* the count of replicas */ |
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tOffset mBlockSize; /* the block size for the file */ |
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char *mOwner; /* the owner of the file */ |
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char *mGroup; /* the group associated with the file */ |
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short mPermissions; /* the permissions associated with the file */ |
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tTime mLastAccess; /* the last access time for the file in seconds */ |
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} hdfsFileInfo; |
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/**
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* hdfsListDirectory - Get list of files/directories for a given |
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* directory-path. hdfsFreeFileInfo should be called to deallocate memory if |
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* the function returns non-NULL value. |
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* @param fs The configured filesystem handle. |
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* @param path The path of the directory.
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* @param numEntries Set to the number of files/directories in path. |
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* @return Returns a dynamically-allocated array of hdfsFileInfo |
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* objects; NULL if empty or on error. |
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* on error, numEntries will be -1. |
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*/ |
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hdfsFileInfo *hdfsListDirectory(hdfsFS fs, const char* path, |
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int *numEntries); |
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/**
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* hdfsGetPathInfo - Get information about a path as a (dynamically |
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* allocated) single hdfsFileInfo struct. hdfsFreeFileInfo should be |
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* called when the pointer is no longer needed. |
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* @param fs The configured filesystem handle. |
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* @param path The path of the file.
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* @return Returns a dynamically-allocated hdfsFileInfo object; |
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* NULL on error. |
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*/ |
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hdfsFileInfo *hdfsGetPathInfo(hdfsFS fs, const char* path); |
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/**
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* hdfsFreeFileInfo - Free up the hdfsFileInfo array (including fields)
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* @param hdfsFileInfo The array of dynamically-allocated hdfsFileInfo |
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* objects. |
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* @param numEntries The size of the array. |
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*/ |
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void hdfsFreeFileInfo(hdfsFileInfo *hdfsFileInfo, int numEntries); |
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/**
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* hdfsGetHosts - Get hostnames where a particular block (determined by |
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* pos & blocksize) of a file is stored. The last element in the array |
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* is NULL. Due to replication, a single block could be present on |
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* multiple hosts. |
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* @param fs The configured filesystem handle. |
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* @param path The path of the file.
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* @param start The start of the block. |
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* @param length The length of the block. |
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* @return Returns a dynamically-allocated 2-d array of blocks-hosts; |
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* NULL on error. |
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*/ |
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char*** hdfsGetHosts(hdfsFS fs, const char* path,
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tOffset start, tOffset length); |
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/**
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* hdfsFreeHosts - Free up the structure returned by hdfsGetHosts |
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* @param hdfsFileInfo The array of dynamically-allocated hdfsFileInfo |
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* objects. |
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* @param numEntries The size of the array. |
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*/ |
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void hdfsFreeHosts(char ***blockHosts); |
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/**
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* hdfsGetDefaultBlockSize - Get the optimum blocksize. |
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* @param fs The configured filesystem handle. |
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* @return Returns the blocksize; -1 on error.
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*/ |
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tOffset hdfsGetDefaultBlockSize(hdfsFS fs); |
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/**
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* hdfsGetCapacity - Return the raw capacity of the filesystem.
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* @param fs The configured filesystem handle. |
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* @return Returns the raw-capacity; -1 on error.
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*/ |
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tOffset hdfsGetCapacity(hdfsFS fs); |
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/**
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* hdfsGetUsed - Return the total raw size of all files in the filesystem. |
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* @param fs The configured filesystem handle. |
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* @return Returns the total-size; -1 on error.
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*/ |
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tOffset hdfsGetUsed(hdfsFS fs); |
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/**
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* hdfsChown
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* @param fs The configured filesystem handle. |
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* @param path the path to the file or directory |
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* @param owner this is a string in Hadoop land. Set to null or "" if only setting group |
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* @param group this is a string in Hadoop land. Set to null or "" if only setting user |
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* @return 0 on success else -1 |
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*/ |
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int hdfsChown(hdfsFS fs, const char* path, const char *owner, const char *group); |
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/**
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* hdfsChmod |
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* @param fs The configured filesystem handle. |
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* @param path the path to the file or directory |
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* @param mode the bitmask to set it to |
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* @return 0 on success else -1 |
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*/ |
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int hdfsChmod(hdfsFS fs, const char* path, short mode); |
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/**
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* hdfsUtime |
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* @param fs The configured filesystem handle. |
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* @param path the path to the file or directory |
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* @param mtime new modification time or 0 for only set access time in seconds |
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* @param atime new access time or 0 for only set modification time in seconds |
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* @return 0 on success else -1 |
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*/ |
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int hdfsUtime(hdfsFS fs, const char* path, tTime mtime, tTime atime); |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif /*LIBHDFS_HDFS_H*/ |
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/**
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* vim: ts=4: sw=4: et |
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*/ |
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@ -0,0 +1,7 @@ |
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export USE_HDFS=1 |
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export LD_LIBRARY_PATH=$JAVA_HOME/jre/lib/amd64/server:$JAVA_HOME/jre/lib/amd64:/usr/lib/hadoop/lib/native |
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|
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export CLASSPATH= |
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for f in `find /usr/lib/hadoop-hdfs | grep jar`; do export CLASSPATH=$CLASSPATH:$f; done |
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for f in `find /usr/lib/hadoop | grep jar`; do export CLASSPATH=$CLASSPATH:$f; done |
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for f in `find /usr/lib/hadoop/client | grep jar`; do export CLASSPATH=$CLASSPATH:$f; done |
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