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https://issues.apache.org/jira/browse/HDFS-2770?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13243676#comment-13243676
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VinayaKumar B commented on HDFS-2770:
-------------------------------------
Hi Todd,
I think corrupt replicas are invalidated only if the Number of good replicas
more than or equal to replication. But you told it is invalidated immediately.
{code}// Add this replica to corruptReplicas Map
corruptReplicas.addToCorruptReplicasMap(storedBlock, node, reason);
if (countNodes(storedBlock).liveReplicas() >= inode.getReplication()) {
// the block is over-replicated so invalidate the replicas immediately
invalidateBlock(storedBlock, node);
} else if (namesystem.isPopulatingReplQueues()) {
// add the block to neededReplication
updateNeededReplications(storedBlock, -1, 0);
}{code}
If number of datanodes equal to replication, out of which one replica is marked
corrupt, then that replica will never be deleted and replication also wont
happen.
Same Issue in HDFS-2932.
> Block reports may mark corrupt blocks pending deletion as non-corrupt
> ---------------------------------------------------------------------
>
> Key: HDFS-2770
> URL: https://issues.apache.org/jira/browse/HDFS-2770
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> Affects Versions: 0.23.0
> Reporter: Todd Lipcon
> Priority: Critical
>
> It seems like HDFS-900 may have regressed in trunk since it was committed
> without a regression test. In HDFS-2742 I saw the following sequence of
> events:
> - A block at replication 2 had one of its replicas marked as corrupt on the NN
> - NN scheduled deletion of that replica in {{invalidateWork}}, and removed it
> from the block map
> - The DN hosting that block sent a block report, which caused the replica to
> get re-added to the block map as if it were good
> - The deletion request was passed to the DN and it deleted the block
> - Now we're in a bad state, where the NN temporarily thinks that it has two
> good replicas, but in fact one of them has been deleted. If we lower
> replication of this block at this time, the one good remaining replica may be
> deleted.
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