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Juhani Connolly commented on HBASE-5699: ---------------------------------------- Since we have had some similar experience posting it here: We are finding most of our IPC threads in our region servers locked into HWal.append(42 out of 50. Of those 20 are in sync, and one is actually working... As is to be expected). We made the presumption that the problem was with the WAL synchronisation mechanisms holding things up and decided to try running multiple RS per node since we had significant amount of free CPU and memory resources as well as many barely active hard disks. By running 3 RS per node, we saw our application specific throughput go from 7k events to 18k. Each event is made up of roughly 2 writes and 2 increments, plus some reads/scans which shouldn't be touching the WAL. This situation is partially also just due to a very high spec per node. I don't think it would be necessary on more "commodity" type servers, but the option to use multiple WAL's on each region server may well give some significant throughput gains for some hardware setups. > Run with > 1 WAL in HRegionServer > --------------------------------- > > Key: HBASE-5699 > URL: https://issues.apache.org/jira/browse/HBASE-5699 > Project: HBase > Issue Type: Improvement > Reporter: binlijin > -- 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