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Fri, 25 Oct 2019 03:40:28 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.1.7-470-gedfae93-fmstable-20191021v4 Mime-Version: 1.0 x-forwarded-message-id: <7f236f1b-cdb6-4157-9b0a-8ba4b6362200@www.fastmail.com> Message-Id: Date: Fri, 25 Oct 2019 09:39:31 +0200 From: "Ondrej Kvasnicka" To: user@hbase.apache.org Subject: Coprocessor restart after region split rollback Content-Type: text/plain Hi all, we are seeing the following behavior in our HBase (version 1.1) and are not sure whether it is an intended behavior or possibly a bug: We have a custom coprocessor loaded (RegionObserver implementation) and see that whenever a region split takes place, prior to the split the coprocessor is stopped automatically (this is expected). However, occasionally the region split will fail and will be rolled back. After a successful rollback, the coprocessor will _not_ be restarted for the region, even though it _was_ running prior to the split attempt. Can someone confirm that this is an intended behavior? We would expect the coprocessor to be automatically re-started after successful region split rollback, but it does not seem to be the case. Are coprocessors supposed to handle the restart themselves after a region split rollback, e.g. in RegionObserver#postRollbackSplit, such as in the following example?: https://github.com/splicemachine/spliceengine/blob/master/hbase_pipeline/src/main/java/com/splicemachine/derby/hbase/SpliceIndexObserver.java#L206 Thanks, Ondrej