[
https://issues.apache.org/jira/browse/HDFS-7993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14494372#comment-14494372
]
Ming Ma commented on HDFS-7993:
-------------------------------
Thanks, Vinay.
bq. In the current output, blk_x len=y repl=3 [dn1, dn2, dn3, dn4], the count
repl=3 exactly gives the count of live replicas excluding decommission(ing/ed).
So i think leaving it as is would be better.
Maybe we can change the description from {{repl}} to {{live repl}}? It will
address the confusion others might have.
bq. As discussed above, this jira is to add the detail/state about each
replica, not just the overall count, which is not available in NumberReplicas.
Good point.
bq. I think this count will be there for long time, since the block report
interval is long. IMO If necessary may go in followup jira
It will be useful to show "stale block content" replica. After NN failover if
there is any over replication, it won't be counted as excess replicas until BR.
So running fsck will show these to-be-excess replicas as "Live Replica"s.
> 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
> Affects Versions: 2.6.0
> Reporter: Ming Ma
> Assignee: J.Andreina
> Attachments: HDFS-7993.1.patch, HDFS-7993.2.patch, HDFS-7993.3.patch
>
>
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
