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Posted to hdfs-dev@hadoop.apache.org by "zhouyingchao (JIRA)" <ji...@apache.org> on 2015/03/02 13:56:05 UTC

[jira] [Created] (HDFS-7868) Use proper blocksize to choose target for blocks

zhouyingchao created HDFS-7868:
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             Summary: Use proper blocksize to choose target for blocks
                 Key: HDFS-7868
                 URL: https://issues.apache.org/jira/browse/HDFS-7868
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: zhouyingchao
            Assignee: zhouyingchao


In BlockPlacementPolicyDefault.java:isGoodTarget, the passed-in blockSize is used to determine if there is enough room for a new block on a data node. However, in two conditions the blockSize might not be proper for the purpose: (a) the passed in block size is just the size of the last block of a file, which might be very small (for e.g., called from BlockManager.ReplicationWork.chooseTargets). (b) A file which might be created with a smaller blocksize.
In these conditions, the calculated scheduledSize might be smaller than the actual value, which finally might lead to following failure of writing or replication.



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