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This directory contains the hdfs extensions needed to make leveldb store
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files in HDFS.
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The hdfs.h file is copied from the Apache Hadoop 1.0 source code.
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It defines the libhdfs library
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(http://hadoop.apache.org/common/docs/r0.20.2/libhdfs.html) to access
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data in HDFS. The libhdfs.a is copied from the Apache Hadoop 1.0 build.
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It implements the API defined in hdfs.h. If your hadoop cluster is running
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a different hadoop release, then install these two files manually from your
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hadoop distribution and then recompile leveldb.
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The env_hdfs.h file defines the leveldb objects that are needed to talk to an
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underlying filesystem.
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If you want to compile leveldb with hdfs support, please set the following
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enviroment variables appropriately:
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USE_HDFS=1
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JAVA_HOME=/usr/local/jdk-6u22-64
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LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$JAVA_HOME/jre/lib/amd64/server:$JAVA_HOME/jre/lib/amd64/:./snappy/libs
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make clean all db_bench
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To run dbbench,
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set CLASSPATH to include your hadoop distribution
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db_bench --hdfs="hdfs://hbaseudbperf001.snc1.facebook.com:9000"
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