Major Description
Before upgrade, data node version was -55. The new data node version remained at -55. During upgrade we got he following messages:
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
after upgrade completing, restart of DN still shows message regarding version difference:
INFO org.apache.hadoop.hdfs.server.common.Storage: Data-node version: -55 and name-node layout version: -56
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.