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https://issues.apache.org/jira/browse/HDFS-3376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13270596#comment-13270596
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Daryn Sharp commented on HDFS-3376:
-----------------------------------
Perhaps a naive question, but why can't {{socket.isClosed()}} be used to
determine if the socket is unusable? The closed sockets could be skipped and
removed from the cache.
> 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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