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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-1062) Compactions at (re)start on a large table can overwhelm DFS
Date Wed, 24 Dec 2008 19:18:44 GMT

     [ https://issues.apache.org/jira/browse/HBASE-1062?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrew Purtell updated HBASE-1062:
----------------------------------

    Attachment: 1062-3.patch

Patch-3 fixes a potential problem where abnormal exit of safe mode thread would prevent memcache
flushes and compactions. 

> 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: 0.19.0
>
>         Attachments: 1062-1.patch, 1062-2.patch, 1062-3.patch
>
>
> 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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