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Posted to hdfs-dev@hadoop.apache.org by "Jason Lowe (JIRA)" <ji...@apache.org> on 2014/08/12 02:48:12 UTC

[jira] [Created] (HDFS-6840) Clients are always sent to the same datanode when read is off rack

Jason Lowe created HDFS-6840:
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             Summary: Clients are always sent to the same datanode when read is off rack
                 Key: HDFS-6840
                 URL: https://issues.apache.org/jira/browse/HDFS-6840
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 2.5.0
            Reporter: Jason Lowe
            Priority: Critical


After HDFS-6268 the sorting order of block locations is deterministic for a given block and locality level (e.g.: local, rack. off-rack), so off-rack clients all see the same datanode for the same block.  This leads to very poor behavior in distributed cache localization and other scenarios where many clients all want the same block data at approximately the same time.  The one datanode is crushed by the load while the other replicas only handle local and rack-local requests.



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