Ming Ma created HDFS-7993:
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Summary: Incorrect descriptions in fsck when nodes are
decommissioned
Key: HDFS-7993
URL: https://issues.apache.org/jira/browse/HDFS-7993
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Ming Ma
When you run fsck with "-files" or "-racks", you will get something like below
if one of the replicas is decommissioned.
{noformat}
blk_x len=y repl=3 [dn1, dn2, dn3, dn4]
{noformat}
That is because in NamenodeFsck,, the repl count comes from live replicas
count; while the actual nodes come from LocatedBlock which include
decommissioned nodes.
Another issue in NamenodeFsck is BlockPlacementPolicy's verifyBlockPlacement
verifies LocatedBlock that includes decommissioned nodes. However, it seems
better to exclude the decommissioned nodes in the verification; just like how
fsck excludes decommissioned nodes when it check for under replicated blocks.
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