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1ca0584345
published in https://reviews.facebook.net/D5997. Summary: This patch allows compaction to occur in multiple background threads concurrently. If a manual compaction is issued, the system falls back to a single-compaction-thread model. This is done to ensure correctess and simplicity of code. When the manual compaction is finished, the system resumes its concurrent-compaction mode automatically. The updates to the manifest are done via group-commit approach. Test Plan: run db_bench |
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| .. | ||
| env_hdfs.h | ||
| hdfs.h | ||
| libhdfs.a | ||
| 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"