rocksdb

History

Igor Canadi eea73226e9 Improve EnvHdfs Summary: Copy improvements from fbcode's version of EnvHdfs to our open-source version. Some very important bug fixes in there. Test Plan: compiles Reviewers: dhruba, haobo, sdong Reviewed By: haobo CC: leveldb Differential Revision: https://reviews.facebook.net/D18711		2014-05-14 12:14:18 -07:00
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env_hdfs.h	Improve EnvHdfs	2014-05-14 12:14:18 -07:00
hdfs.h	Add appropriate LICENSE and Copyright message.	2013-10-16 17:48:41 -07:00
libhdfs.a	Add libhdfs.a to the build process.	2012-08-29 15:21:56 -07:00
README	Migrate names of properties from 'leveldb' prefix to 'rocksdb' prefix.	2013-10-06 00:14:26 -07:00

README

This directory contains the hdfs extensions needed to make rocksdb store
files in HDFS.

The hdfs.h file is copied from the Apache Hadoop 1.0 source code. 
It defines the libhdfs library
(http://hadoop.apache.org/common/docs/r0.20.2/libhdfs.html) to access 
data in HDFS.  The libhdfs.a is copied from the Apache Hadoop 1.0 build. 
It implements the API defined in hdfs.h. If your hadoop cluster is running
a different hadoop release, then install these two files manually from your
hadoop distribution and then recompile rocksdb.

The env_hdfs.h file defines the rocksdb objects that are needed to talk to an
underlying filesystem. 

If you want to compile rocksdb with hdfs support, please set the following
enviroment variables appropriately:
   USE_HDFS=1
   JAVA_HOME=/usr/local/jdk-6u22-64
   LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/jdk-6u22-64/jre/lib/amd64/server:/usr/local/jdk-6u22-64/jre/lib/amd64/:./snappy/libs
   make clean all db_bench

To run dbbench,
  set CLASSPATH to include your hadoop distribution
  db_bench --hdfs="hdfs://hbaseudbperf001.snc1.facebook.com:9000"