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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15417) Calls to ObserverContext#bypass in a region observer's prePut method are inconsistent
Date Tue, 08 Mar 2016 09:08:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15184691#comment-15184691

Anoop Sam John commented on HBASE-15417:

To be consistent with what other mutations doing (increment, append) and hooks around get,
we should not call post hook on a mutation when the pre hook done a bypass for that mutation.
Also checked behavior of some other pre, post hooks which allows bypass. Like pre/post ScannerOpen.
 Here the post hook is called in any case (either pre bypassed or not)

> Calls to ObserverContext#bypass in a region observer's prePut method are inconsistent
> -------------------------------------------------------------------------------------
>                 Key: HBASE-15417
>                 URL: https://issues.apache.org/jira/browse/HBASE-15417
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Harry Harpham
>            Priority: Minor
> Calling ctx.bypass(), where ctx is the ObserverContext object passed in to the region
observer's prePut method, results in some inconsistent behavior.
> If every other put in the batch is also bypassed, the region observer sees none of these
in its postPut method.  If there is at least one other put which is not bypassed, the region
observer sees all of the puts in the batch _including those which were bypassed_.
> The end result is that, after bypassing a put, that put may or may not end up in the
region observer's postPut method.  This behavior is dependent solely on which other puts the
bypassed put is batched together with.
> I tried to find existing tickets for this issue, but was unable to.  Apologies if I missed
something.  The closest issues I could find were HBASE-4331 and HBASE-11503, but those didn't
seem to quite hit it.
> Additionally, I threw together a quick demonstration of this issue: https://github.com/hwh33/bypass-inconsistency-demo.
 You can run that demo in memory using the testing utility or against a running cluster. 
I actually haven't had time to test it against a cluster though, so you may encounter bugs
if running in that mode (but hopefully not!).

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