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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1062) Compactions at (re)start on a very large table can overwhelm DFS
Date Sun, 14 Dec 2008 12:52:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12656386#action_12656386

Andrew Purtell commented on HBASE-1062:

One way to handle this is to extend the concept of safe mode to the regionservers. They should
hold off on compactions and splits for some configurable interval, and then slowly ramp up
compactions/splits with randomized hold intervals to avoid thundering herd behavior. 

> Compactions at (re)start on a very large table can overwhelm DFS
> ----------------------------------------------------------------
>                 Key: HBASE-1062
>                 URL: https://issues.apache.org/jira/browse/HBASE-1062
>             Project: Hadoop HBase
>          Issue Type: Bug
>            Reporter: Andrew Purtell
> 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

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