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From "Liang Xie (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-6524) chooseDataNode decides retry times considering with block replica number
Date Fri, 13 Jun 2014 04:27:01 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6524?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Liang Xie updated HDFS-6524:
----------------------------

    Attachment: HDFS-6524.txt

> 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
>         Attachments: HDFS-6524.txt
>
>
> 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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