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From "Vinay (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 Tue, 04 Feb 2014 17:20:14 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13890866#comment-13890866
] 

Vinay commented on HADOOP-10131:
--------------------------------

Hi, can someone please take a look at the patch. Thanks in advance.

> 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: Vinay
>            Assignee: Vinay
>         Attachments: 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.



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