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Date: Tue, 18 Apr 2017 18:07:41 +0000 (UTC)
From: "Lars Hofhansl (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Comment Edited] (HBASE-17937) Memstore size becomes
 negative in case of expensive postPut/Delete Coprocessor call
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archived-at: Tue, 18 Apr 2017 18:07:45 -0000


    [ https://issues.apache.org/jira/browse/HBASE-17937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15973189#comment-15973189 ] 

Lars Hofhansl edited comment on HBASE-17937 at 4/18/17 6:06 PM:
----------------------------------------------------------------

Agreed. I think it's just [~abhishek.chouhan]'s fix, with the first size update moved right after the logsync.


was (Author: lhofhansl):
Agreed. I think it's just [~abhishek.chouhan]'s fix, which the first size update move right after the logsync.

> Memstore size becomes negative in case of expensive postPut/Delete Coprocessor call
> -----------------------------------------------------------------------------------
>
>                 Key: HBASE-17937
>                 URL: https://issues.apache.org/jira/browse/HBASE-17937
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 2.0.0, 1.3.1, 0.98.24
>            Reporter: Abhishek Singh Chouhan
>            Assignee: Abhishek Singh Chouhan
>         Attachments: HBASE-17937.master.001.patch
>
>
> We ran into a situation where the memstore size became negative due to expensive postPut/Delete Coprocessor calls in doMiniBatchMutate. We update the memstore size in the finally block of doMiniBatchMutate, however a queued flush can be triggered during the coprocessor calls(if they are taking time eg. index updates) since we have released the locks and advanced mvcc at this point. The flush will turn the memstore size negative since the value subtracted is the actual value flushed from stores. The negative value impacts the future flushes amongst others that depend on memstore size.


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