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Posted to hdfs-dev@hadoop.apache.org by "Ming Ma (JIRA)" <ji...@apache.org> on 2015/03/26 04:04:57 UTC
[jira] [Created] (HDFS-7993) Incorrect descriptions in fsck when
nodes are decommissioned
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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