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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1062) Compactions at (re)start on a large table can overwhelm DFS
Date Sun, 14 Dec 2008 21:57:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12656476#action_12656476
] 

stack commented on HBASE-1062:
------------------------------

Just saw the 'safe mode' for HRSs suggestion.  I like that.  In general, we need to do some
work to make it so cluster boots as fast as possible and is immediately useable -- not sort-of
online but soaked running major compactions and splits, etc.

> Compactions at (re)start on a large table can overwhelm DFS
> -----------------------------------------------------------
>
>                 Key: HBASE-1062
>                 URL: https://issues.apache.org/jira/browse/HBASE-1062
>             Project: Hadoop HBase
>          Issue Type: Bug
>          Components: regionserver
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>            Priority: Critical
>             Fix For: 0.20.0
>
>
> Given a large table, > 1000 regions for example, if a cluster restart is necessary,
the compactions undertaken by the regionservers when the master makes initial region assignments
can overwhelm DFS, leading to file errors and data loss. This condition is exacerbated if
write load was heavy before restart and so many regions want to split as soon as they are
opened. 

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