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https://issues.apache.org/jira/browse/HADOOP-2346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12548372
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Raghu Angadi commented on HADOOP-2346:
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A new FilterInputStream would poll only when read or write fails with EAGAIN
(some Java equivalent). So it does not slow down fast clients. I don't think a
poll() costs much.. especially when we are polling when required. If there are
a lot of clients reading from DataNode, bottleneck is most certainly going to
be disk.
We don't strictly need this for 16.
> DataNode should have timeout on socket writes.
> ----------------------------------------------
>
> Key: HADOOP-2346
> URL: https://issues.apache.org/jira/browse/HADOOP-2346
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.15.1
> Reporter: Raghu Angadi
>
> If a client opens a file and stops reading in the middle, DataNode thread
> writing the data could be stuck forever. For DataNode sockets we set read
> timeout but not write timeout. I think we should add a write(data, timeout)
> method in IOUtils that assumes it the underlying FileChannel is non-blocking.
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