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Todd Lipcon commented on HBASE-4608: ------------------------------------ I haven't looked at the patch yet, but it would be great if you could build a tool to go along with this for testing that compresses/decompresses logs. EG: bin/hbase org.apache.hadoop.hbase.....HLogTool -compress /path/to/hlog /path/to/hlog.compressed bin/hbase org.apache.hadoop.hbase.....HLogTool -uncompress /path/to/hlog.compressed /path/to/hlog .. or something like that. Then real users could see what kind of compression ratio they could expect (and it serves as a decent test that compress/uncompress yields the original file) > HLog Compression > ---------------- > > Key: HBASE-4608 > URL: https://issues.apache.org/jira/browse/HBASE-4608 > Project: HBase > Issue Type: New Feature > Reporter: Li Pi > Assignee: Li Pi > Attachments: 4608v1.txt > > > The current bottleneck to HBase write speed is replicating the WAL appends > across different datanodes. We can speed up this process by compressing the > HLog. Current plan involves using a dictionary to compress table name, region > id, cf name, and possibly other bits of repeated data. Also, HLog format may > be changed in other ways to produce a smaller HLog. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira