FAQ
Hi Guys,

I recently upgraded my cluster CDH4.4.0 to CDH5-beta. In my case CDH
upgradation not smooth. It's breaks. I got this Error.


2013-11-28 13:37:18,500 FATAL
org.apache.hadoop.hdfs.server.namenode.NameNode: Exception in namenode
join
java.io.IOException:
File system image contains an old layout version -40.
An upgrade to version -47 is required.
Please restart NameNode with -upgrade option.

I went to dfs directory

Before update HDFS Metadata process

=============================== =====

root@dhana231:~# cat /disk1/dfs/nn/current/VERSION
#Sun Dec 08 06:13:17 EST 2013
namespaceID=1241050812
clusterID=cluster41
cTime=0
storageType=NAME_NODE
blockpoolID=BP-1489715461-192.168.70.231-1386155632953*layoutVersion=-40*

all the VERSION files as layoutVersion=-40

After update HDFS Metadata process

=============================== =====

I noticed

~# cat /disk1/dfs/nn/current/VERSION
#Tue Dec 10 18:31:23 EST 2013
namespaceID=1241050812
clusterID=cluster41
cTime=1386718283823
storageType=NAME_NODE
blockpoolID=BP-1489715461-192.168.70.231-1386155632953*layoutVersion=-47*


layoutVersion changes will happen. all the nodes. I'm curious about How
actually CM script will internally do any sed and awk operations . Or any
hdfs command will do this operation.

I want know each hadoop will maintain any particular layout version number
or it's random number.

Also one more this HBASE also doing HBASE metadata update.

Guys can you guide what internally command are executing and what script
will exec. when upgrade process will happen.

-Dhanasekaran.


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postedDec 11, '13 at 10:29p
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