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https://issues.apache.org/jira/browse/HADOOP-1200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12490136
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dhruba borthakur commented on HADOOP-1200:
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Instead of a periodic thread, we can invoke checkDir when an IO error occurs.
> Datanode should periodically do a disk check
> --------------------------------------------
>
> Key: HADOOP-1200
> URL: https://issues.apache.org/jira/browse/HADOOP-1200
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.12.2
> Reporter: Hairong Kuang
> Fix For: 0.13.0
>
>
> HADOOP-1170 removed the disk checking feature. But this is a needed feature
> for maintaining a large cluster. I agree that checking the disk on every I/O
> is too costly. A nicer approach is to have a thread that periodically do a
> disk check. It then automatically decommissions itself when any error occurs.
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