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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-13885) ZK watches leaks during snapshots
Date Fri, 12 Jun 2015 23:52:00 GMT

     [ https://issues.apache.org/jira/browse/HBASE-13885?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lars Hofhansl updated HBASE-13885:
----------------------------------
    Attachment: 13885-0.98-v3.txt

This one does work.

The idea is to always create the abort and acquired znodes. The patch does that at the time
we're ready to clear the existing znodes. It simply creates them if they don't exist, before
deleting them.

The watches then simply ignore an empty data znode.

Please have a look.

> ZK watches leaks during snapshots
> ---------------------------------
>
>                 Key: HBASE-13885
>                 URL: https://issues.apache.org/jira/browse/HBASE-13885
>             Project: HBase
>          Issue Type: Bug
>          Components: snapshots
>    Affects Versions: 0.98.12
>            Reporter: Abhishek Singh Chouhan
>            Priority: Critical
>         Attachments: 13885-0.98-v2.txt, 13885-0.98-v3.txt
>
>
> When taking snapshot of a table a watcher over /hbase/online-snapshot/abort/snapshot-name
is created which is never cleared when the snapshot is successful. If we use snapshots to
take backups daily we accumulate a lot of watches.
> Steps to reproduce -
> 1) Take snapshot of a table - snapshot 'table_1', 'abc'
> 2) Run the following on zk node or alternatively observe zk watches metric
>  echo "wchc" | nc localhost 2181
> /hbase/online-snapshot/abort/abc can be found.



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