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From "Yi Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8863) The remaining space check in BlockPlacementPolicyDefault is flawed
Date Wed, 19 Aug 2015 01:38:46 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14702281#comment-14702281
] 

Yi Liu commented on HDFS-8863:
------------------------------

Thanks [~kihwal] for updating, +1 pending Jenkins.

> The remaining space check in BlockPlacementPolicyDefault is flawed
> ------------------------------------------------------------------
>
>                 Key: HDFS-8863
>                 URL: https://issues.apache.org/jira/browse/HDFS-8863
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.6.0
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>            Priority: Critical
>              Labels: 2.6.1-candidate
>         Attachments: HDFS-8863.patch, HDFS-8863.v2.patch, HDFS-8863.v3.patch
>
>
> The block placement policy calls {{DatanodeDescriptor#getRemaining(StorageType}}}} to
check whether the block is going to fit. Since the method is adding up all remaining spaces,
namenode can allocate a new block on a full node. This causes pipeline construction failure
and {{abandonBlock}}. If the cluster is nearly full, the client might hit this multiple times
and the write can fail permanently.



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