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From "nkeywal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1075) Separately configure connect timeouts from read timeouts in data path
Date Wed, 15 Aug 2012 08:40:38 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13434882#comment-13434882

nkeywal commented on HDFS-1075:

This could be very useful. The connect is not impacted by stuff like garbage collection; so
if the node is still alive, it will reply to the connect quickly.
> Separately configure connect timeouts from read timeouts in data path
> ---------------------------------------------------------------------
>                 Key: HDFS-1075
>                 URL: https://issues.apache.org/jira/browse/HDFS-1075
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node, hdfs client
>            Reporter: Todd Lipcon
> The timeout configurations in the write pipeline overload the read timeout to also include
a connect timeout. In my experience, if a node is down it can take many seconds to get back
an exception connect, whereas if it is up it will accept almost immediately, even if heavily
loaded (the kernel listen backlog picks it up very fast). So in the interest of faster dead
node detection from the writer perspective, the connect timeout should be configured separately,
usually to a much lower time than the read timeout.

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