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From "Vinayakumar B (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10131) NetWorkTopology#countNumOfAvailableNodes() is returning wrong value if excluded nodes passed are not part of the cluster tree
Date Mon, 22 Sep 2014 06:02:34 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14142928#comment-14142928
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Vinayakumar B commented on HADOOP-10131:
----------------------------------------

Committed trunk and branch-2. 
Thanks again.

> NetWorkTopology#countNumOfAvailableNodes() is returning wrong value if excluded nodes
passed are not part of the cluster tree
> -----------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-10131
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10131
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 3.0.0, 2.0.5-alpha
>            Reporter: Vinayakumar B
>            Assignee: Vinayakumar B
>             Fix For: 2.6.0
>
>         Attachments: HADOOP-10131-002.patch, HADOOP-10131.patch, HDFS-5112.patch
>
>
> I got "File /hdfs_COPYING_ could only be replicated to 0 nodes instead of minReplication
(=1).  There are 1 datanode(s) running and 1 node(s) are excluded in this operation." in the
following case
> 1. 2 DNs cluster,
> 2. One of the datanodes was not responding from last 10 min, but about to detect as dead
at NN.
> 3. Tried to write one file, for the block NN allocated both DNs.
> 4. Client While creating the pipeline took some time to detect one node failure.
> 5. Before client detects pipeline failure, NN side dead node was removed from cluster
map.
> 6. Now, client has abandoned previous block and asked for new block with dead node in
excluded list and got above exception even though one more node was available live.
> When I dig this more, found that,
> {{NetWorkTopology#countNumOfAvailableNodes()}} is not giving correct count when the excludeNodes
passed from client are not part of the cluster map.
> Adding to this one more case where count is wrong.
> 1. If there is no node present for the normalized scope in cluster.



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