You are viewing a plain text version of this content. The canonical link for it is here.

Posted to issues@hbase.apache.org by "Patrick (JIRA)" <ji...@apache.org> on 2013/07/02 02:44:20 UTC

[jira] [Commented] (HBASE-8844) Document stop_replication danger

    [ https://issues.apache.org/jira/browse/HBASE-8844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13697376#comment-13697376 ] 

Patrick commented on HBASE-8844:
--------------------------------

Am I correct in assuming that stop_replication will not harm the master cluster, and will only have a negative effect on the backup cluster (leave it in an undetermined state)? There's a big difference between data loss on the master, and data loss in the standby :)

This may be from lack of familiarity with HBase, but it's not clear to me what this means: "start/stop replication is only meant to be used in critical load situations". Specifically, I don't know what a critical load situation is. Are we talking about server load (as in load average)? If that's the case, is the idea to stop replication until load goes down, then start it again?
                
> 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

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira