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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:
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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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