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https://issues.apache.org/jira/browse/HDFS-6597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14055382#comment-14055382
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Chris Nauroth commented on HDFS-6597:
-------------------------------------
The new patch proposal for naming the option "-upgradeOnly" looks good to me.
I'd say it would be good to go ahead with full implementation using that
naming. Thanks, [~dvunjak]!
> Add a new option to NN upgrade to terminate the process after upgrade on NN
> is completed
> ----------------------------------------------------------------------------------------
>
> Key: HDFS-6597
> URL: https://issues.apache.org/jira/browse/HDFS-6597
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: Danilo Vunjak
> Attachments: JIRA-HDFS-30.patch, JIRA-HDFS-6597.patch
>
>
> Currently when namenode is started for upgrade (hadoop namenode -upgrade
> command), after finishing upgrade of metadata, namenode starts working
> normally and wait for datanodes to upgrade itself and connect to to NN. We
> need to have option for upgrading only NN metadata, so after upgrade is
> finished on NN, process should terminate.
> I have tested it by changing in file: hdfs.server.namenode.NameNode.java,
> method: public static NameNode createNameNode(String argv[], Configuration
> conf):
> in switch added
> case UPGRADE:
> case UPGRADE:
> {
> DefaultMetricsSystem.initialize("NameNode");
> NameNode nameNode = new NameNode(conf);
> if (startOpt.getForceUpgrade()) {
> terminate(0);
> return null;
> }
>
> return nameNode;
> }
> This did upgrade of metadata, closed process after finished, and later when
> all services were started, upgrade of datanodes finished sucessfully and
> system run .
> What I'm suggesting right now is to add new startup parameter "-force", so
> namenode can be started like this "hadoop namenode -upgrade -force", so we
> can indicate that we want to terminate process after upgrade metadata on NN
> is finished. Old functionality should be preserved, so users can run "hadoop
> namenode -upgrade" on same way and with same behaviour as it was previous.
> Thanks,
> Danilo
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