rocksdb

History

Kosie van der Merwe d6e873f22f Added clearer error message for failure to create db directory in DBImpl::Recover() Summary: Changed CreateDir() to CreateDirIfMissing() so a directory that already exists now causes and error. Fixed CreateDirIfMissing() and added Env.DirExists() Test Plan: make check to test for regessions Ran the following to test if the error message is not about lock files not existing ./db_bench --db=dir/testdb After creating a file "testdb", ran the following to see if it failed with sane error message: ./db_bench --db=testdb Reviewers: dhruba, emayanke, vamsi, sheki Reviewed By: emayanke CC: leveldb Differential Revision: https://reviews.facebook.net/D7707		2013-01-07 10:11:18 -08:00
..
README	Create leveldb server via Thrift.	2012-07-07 09:42:39 -07:00
env_hdfs.h	Added clearer error message for failure to create db directory in DBImpl::Recover()	2013-01-07 10:11:18 -08:00
hdfs.h	Make Leveldb save data into HDFS files. You have to set USE_HDFS in your environment variable to compile leveldb with HDFS support.	2012-06-14 00:29:01 -07:00
libhdfs.a	Add libhdfs.a to the build process.	2012-08-29 15:21:56 -07:00

README

This directory contains the hdfs extensions needed to make leveldb 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 leveldb.

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

If you want to compile leveldb 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"