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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