suja s created HDFS-3512:
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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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