FAQ
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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postedJan 23, '10 at 1:43a
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