Fixing build failure

Summary: virtual NewRandomRWFile is not implemented on EnvHdfs, causing build failure.

Test Plan: make clean; make all check

Reviewers: dhruba, haobo, kailiu

Reviewed By: kailiu

CC: leveldb

Differential Revision: https://reviews.facebook.net/D13383

hdfs/env_hdfs.h

@@ -79,6 +79,10 @@ class HdfsEnv : public Env {
   virtual Status NewWritableFile(const std::string& fname,
                                  WritableFile** result);
 
+  virtual Status NewRandomRWFile(const std::string& fname,
+                                 unique_ptr<RandomRWFile>* result,
+                                 const EnvOptions& options);
+
   virtual bool FileExists(const std::string& fname);
 
   virtual Status GetChildren(const std::string& path,
@@ -249,6 +253,12 @@ class HdfsEnv : public Env {
     return notsup;
   }
 
+  virtual Status NewRandomRWFile(const std::string& fname,
+                                 unique_ptr<RandomRWFile>* result,
+                                 const EnvOptions& options) {
+    return notsup;
+  }
+
   virtual bool FileExists(const std::string& fname){return false;}
 
   virtual Status GetChildren(const std::string& path,

util/env_hdfs.cc

@@ -374,6 +374,12 @@ Status HdfsEnv::NewWritableFile(const std::string& fname,
   return Status::OK();
 }
 
+Status HdfsEnv::NewRandomRWFile(const std::string& fname,
+                                unique_ptr<RandomRWFile>* result,
+                                const EnvOptions& options) {
+  return Status::NotSupported("NewRandomRWFile not supported on HdfsEnv");
+}
+
 bool HdfsEnv::FileExists(const std::string& fname) {
   int value = hdfsExists(fileSys_, fname.c_str());
   if (value == 0) {