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Date: Tue, 2 Dec 2008 20:58:44 -0800 (PST)
From: "Suresh Srinivas (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-3574) Better Datanode
 DiskOutOfSpaceException handling.
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    [ https://issues.apache.org/jira/browse/HADOOP-3574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12652684#action_12652684 ] 

Suresh Srinivas commented on HADOOP-3574:
-----------------------------------------

Should we create another jira to recover form this condition. We could use mechanism similar to balancer to move some blocks to other datanodes to free up space? Datanodes could also indicate this condition to namenode and trigger freeing up space by moving blocks. Alternatively, this could also be done proactively by the namenode when the free space reported by the datanode (during heartbeat) goes below certain threshold. This will improve robustness.

> Better Datanode DiskOutOfSpaceException handling.
> -------------------------------------------------
>
>                 Key: HADOOP-3574
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3574
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: Tsz Wo (Nicholas), SZE
>
> When a datanode ran out of disk space, it throws DiskOutOfSpaceException internally.  However, it does not notify the writing client about the exception.  As a result, the client will wait until socket timeout.

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