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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-917) Write pipeline heartbeat interval should be determined by client timeout, not DN
Date Sat, 23 Jan 2010 01:43:21 GMT
Write pipeline heartbeat interval should be determined by client timeout, not DN
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                 Key: HDFS-917
                 URL: https://issues.apache.org/jira/browse/HDFS-917
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs client
    Affects Versions: 0.22.0
            Reporter: Todd Lipcon


For the dfs client timeouts to be more effective, they should be communicated to the DN on
the start of a write, so that the DN can send heartbeats at a fast enough rate. Currently,
the pipeline heartbeats are half the datanode's socket timeout, so a DFS client with a very
low timeout will fail if it's not continuously writing application data.

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