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From "Dave Latham (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8844) Document stop_replication danger
Date Tue, 02 Jul 2013 03:56:21 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13697482#comment-13697482
] 

Dave Latham commented on HBASE-8844:
------------------------------------

There are some cases where it can affect the master cluster as well.  We actually were bit
in the master cluster by having the master go OutOfMemory a couple of weeks after using stop_replication.
 We did not lose any data from the master cluster.  Some more details in the thread here:
http://mail-archives.apache.org/mod_mbox/hbase-user/201302.mbox/%3CCAA4mzoky-4G-235_ta41tDNfL1K-RtT0f3Q=XLXF930Wq=y_nw@mail.gmail.com%3E

The main cause if replication is enabled in the configuration but you run stop_replication
then the master will stop cleaning out all HLog files from .oldlogs.  (e.g. HBASE-3489)

Now that HBASE-3134 is in I would recommend always using disable_peer rather than stop_replication
and treat stop_replication as dangerous.
                
> Document stop_replication danger
> --------------------------------
>
>                 Key: HBASE-8844
>                 URL: https://issues.apache.org/jira/browse/HBASE-8844
>             Project: HBase
>          Issue Type: Task
>          Components: documentation
>            Reporter: Patrick
>            Priority: Minor
>         Attachments: HBASE-8844.patch
>
>
> The first two tutorials for enabling replication that google gives me [1], [2] take very
different tones with regard to stop_replication. The HBase docs [1] make it sound fine to
start and stop replication as desired. The Cloudera docs [2] say it may cause data loss.
> Which is true? If data loss is possible, are we talking about data loss in the primary
cluster, or data loss in the standby cluster (presumably would require reinitializing the
sync with a new CopyTable).
> [1] http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/replication/package-summary.html#requirements
> [2] http://www.cloudera.com/content/cloudera-content/cloudera-docs/CDH4/4.2.0/CDH4-Installation-Guide/cdh4ig_topic_20_11.html

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