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Lars Hofhansl commented on HBASE-5897: -------------------------------------- You beat me to it Ted :) I was also going to suggest to remove the new precondition checks. In both cases nothing incorrect will happen (if the prePut skips or the Put has writeToWal==false, the WAL is not applied), but we're changing the coprocessor protocol slightly. > prePut coprocessor hook causing substantial CPU usage > ----------------------------------------------------- > > Key: HBASE-5897 > URL: https://issues.apache.org/jira/browse/HBASE-5897 > Project: HBase > Issue Type: Bug > Affects Versions: 0.92.0 > Reporter: Todd Lipcon > Assignee: Todd Lipcon > Priority: Critical > Fix For: 0.92.2, 0.94.0, 0.96.0 > > Attachments: 5897-simple.txt, 5897-v2.txt, hbase-5897.txt, > testRegionServerCoprocessorExceptionWithRemove.stack > > > I was running an insert workload against trunk under oprofile and saw that a > significant portion of CPU usage was going to calling the "prePut" > coprocessor hook inside doMiniBatchPut, even though I don't have any > coprocessors installed. I ran a million-row insert and collected CPU time > spent in the RS after commenting out the preput hook, and found CPU usage > reduced by 33%. -- 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