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https://issues.apache.org/jira/browse/HDFS-6797?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14081335#comment-14081335
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Arpit Agarwal commented on HDFS-6797:
-------------------------------------
+1 will commit this later today.
> Misleading LayoutVersion information during data node upgrade
> -------------------------------------------------------------
>
> Key: HDFS-6797
> URL: https://issues.apache.org/jira/browse/HDFS-6797
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 2.4.1
> Reporter: Benoy Antony
> Assignee: Benoy Antony
> Attachments: HDFS-6797.patch
>
>
> Before upgrade, data node version was -55. The new data node version remained
> at -55. During upgrade we got he following messages:
> {code}
> 2014-07-15 12:59:55,253 INFO org.apache.hadoop.hdfs.server.common.Storage:
> Data-node version: -55 and name-node layout version: -56
> ...
> ...
> ...
> ...
> 2014-07-15 12:59:56,479 INFO org.apache.hadoop.hdfs.server.common.Storage:
> Upgrading block pool storage directory
> /hadoop/1/data1/current/BP-825373266-xx.xxx.xxx.xx-1379095203239.
> old LV = -55; old CTime = 1402508907789.
> new LV = -56; new CTime = 1405453914270
> 2014-07-15 13:00:07,697 INFO org.apache.hadoop.hdfs.server.common.Storage:
> Upgrade of block pool BP-825373266-xx.xxx.xxx.xx-1379095203239 at
> /hadoop/12/data1/current/BP-825373266-xx.xxx.xxx.xx-1379095203239 is complete
> 2014-07-15 13:00:07,839 INFO org.apache.hadoop.hdfs.server.datanode.DataNode:
> Setting up storage:
> nsid=859725752;bpid=BP-825373266-xx.xxx.xxx.xx-1379095203239;lv=-55;nsInfo=lv=-56;cid=CID-303ee504-e03c-4a5e-bc59-2b275b308152;nsid=859725752;c=1405453914270;bpid=BP-82537326
> 6-xx.xxx.xxx.xx-1379095203239;dnuuid=b1011b87-d7cd-48ce-92cc-f7cca0e8cbae
> {code}
> after upgrade completing, restart of DN still shows message regarding version
> difference:
> {code}
> INFO org.apache.hadoop.hdfs.server.common.Storage: Data-node version: -55 and
> name-node layout version: -56
> {code}
> This causes confusion to the operators as if upgrade did not succeed since
> data node's layout version is not updated to the "new LV" value
> Actually name node's layout version is displayed as the "new LV" value.
> Since the data node and name node layout versions are separate now, the new
> data node layout version should be shown as the “new LV”.
> Thanks to [~ehf] who found and reported this issue.
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