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From "Liang Xie (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-6524) chooseDataNode decides retry times considering with block replica number
Date Fri, 13 Jun 2014 03:30:02 GMT
Liang Xie created HDFS-6524:
-------------------------------

             Summary: chooseDataNode decides retry times considering with block replica number
                 Key: HDFS-6524
                 URL: https://issues.apache.org/jira/browse/HDFS-6524
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs-client
    Affects Versions: 3.0.0
            Reporter: Liang Xie
            Assignee: Liang Xie
            Priority: Minor


Currently the chooseDataNode() does retry with the setting: dfsClientConf.maxBlockAcquireFailures,
which by default is 3 (DFS_CLIENT_MAX_BLOCK_ACQUIRE_FAILURES_DEFAULT = 3), it would be better
having another option, block replication factor. One cluster with only  two block replica
setting, or using Reed-solomon encoding solution with one replica factor. It helps to reduce
the long tail latency.



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