chunhui shen created HBASE-5913: ----------------------------------- Summary: Speed up the full scan of META Key: HBASE-5913 URL: https://issues.apache.org/jira/browse/HBASE-5913 Project: HBase Issue Type: Improvement Reporter: chunhui shen Assignee: chunhui shen Attachments: HBASE-5913.patch
In the master, we will do the full scan of META in some situations for example, 1.master start up 2.CatalogJanitor do the full scan per 5 mins 3.ServerShutdownHandler, getServerUserRegions for dead server. For the online applications, we should try the best to reduce the process time of ServerShutdownHandler in the situation 3. However, we found MetaReader#getServerUserRegions take 14mins for 10w regions in our production environment. And it is caused by two reasons: The first, we don't use cache and get one row per next() when fully scan .META. The second, "hbase.ipc.client.tcpnodelay" is false as default, and in our environment it take 40ms for per next() (It is related to the length of row in the .META. , if someone also found, could try to set it true) For this issue, I think we could set the caching when do the full scan of META -- 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