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https://issues.apache.org/jira/browse/HDFS-3376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13269894#comment-13269894
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Todd Lipcon commented on HDFS-3376:
-----------------------------------
Hi Bobby. I think we need to do the following series: HADOOP-8280, HADOOP-8350,
HDFS-3357, then this one. Does that look good to you? The reason for
HADOOP-8280 is that the test for HADOOP-8350 depends on GenericTestUtils being
in common.
> DFSClient fails to make connection to DN if there are many unusable cached
> sockets
> ----------------------------------------------------------------------------------
>
> Key: HDFS-3376
> URL: https://issues.apache.org/jira/browse/HDFS-3376
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs client
> Affects Versions: 2.0.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Critical
> Fix For: 2.0.0
>
> Attachments: hdfs-3376.txt
>
>
> After fixing the datanode side of keepalive to properly disconnect stale
> clients, (HDFS-3357), the client side has the following issue: when it
> connects to a DN, it first tries to use cached sockets, and will try a
> configurable number of sockets from the cache. If there are more cached
> sockets than the configured number of retries, and all of them have been
> closed by the datanode side, then the client will throw an exception and mark
> the replica node as dead.
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