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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10935) support snapshot policy where flush memstore can be skipped to prevent production cluster freeze
Date Fri, 18 Apr 2014 15:55:17 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13974179#comment-13974179
] 

Ted Yu commented on HBASE-10935:
--------------------------------

{code}
+          LOG.debug("take snapshot without flush memstore first");
{code}
'without flush' -> 'without flushing'
{code}
+         * To minimized the code change, I will not change the class name.
{code}
Change the second part of the sentence to 'class name is not changed'

Please attach patch for trunk.
Also, update release note.

> support snapshot policy where flush memstore can be skipped to prevent production cluster
freeze
> ------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-10935
>                 URL: https://issues.apache.org/jira/browse/HBASE-10935
>             Project: HBase
>          Issue Type: New Feature
>          Components: shell, snapshots
>    Affects Versions: 0.94.7, 0.94.18
>            Reporter: Tianying Chang
>            Assignee: Tianying Chang
>            Priority: Minor
>             Fix For: 0.94.20
>
>         Attachments: HBase-10935.patch
>
>
> We are using snapshot feature to do HBase disaster recovery. We will do snapshot in our
production cluster periodically. The current flush snapshot policy require all regions of
the table to coordinate to prevent write and do flush at the same time. Since we use WALPlayer
to complete the data that is not in the snapshot HFile, we don't need the snapshot to do coordinated
flush. The snapshot just recored all the HFile that are already there. 
> I added the parameter in the HBase shell. So people can choose to use the NoFlush snapshot
when they need, like below. Otherwise, the default flush snpahot support is not impacted.

> >snaphot 'TestTable', 'TestSnapshot', 'skipFlush'



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