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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1075) Separately configure connect timeouts from read timeouts in data path
Date Fri, 02 Apr 2010 17:14:27 GMT
Separately configure connect timeouts from read timeouts in data path
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                 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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