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From "suja s (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3512) Delay in scanning blocks at DN side when there are huge number of blocks
Date Wed, 06 Jun 2012 04:31:22 GMT
suja s created HDFS-3512:
----------------------------

             Summary: Delay in scanning blocks at DN side when there are huge number of blocks
                 Key: HDFS-3512
                 URL: https://issues.apache.org/jira/browse/HDFS-3512
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: data-node
    Affects Versions: 2.0.1-alpha
            Reporter: suja s


Block scanner maintains the full list of blocks at DN side in a map and there is no differentiation
between the blocks which are already scanned and the ones not scanend. For every check (ie
every 5 secs) it will pick one block and scan. There are chances that it chooses a block which
is already scanned which leads to further delay in scanning of blcoks which are yet to be
scanned.



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