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From "rajeshbabu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-7244) Provide a command or argument to startup, that formats znodes if provided
Date Thu, 07 Mar 2013 10:02:16 GMT

     [ https://issues.apache.org/jira/browse/HBASE-7244?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

rajeshbabu updated HBASE-7244:
------------------------------

    Attachment: HBASE-7244.patch

@Harsh
Here is the patch we are using in our cluster. We have also same requirements as you said
in description. Instread of changing startup script we have written seperate cleanup script
which cleans zookeeper and hdfs data related to hbase if no hbase process like master,regionserver,backupmaster
is alive. 

Please review.
                
> Provide a command or argument to startup, that formats znodes if provided
> -------------------------------------------------------------------------
>
>                 Key: HBASE-7244
>                 URL: https://issues.apache.org/jira/browse/HBASE-7244
>             Project: HBase
>          Issue Type: New Feature
>          Components: Zookeeper
>    Affects Versions: 0.94.0
>            Reporter: Harsh J
>            Priority: Minor
>         Attachments: HBASE-7244.patch
>
>
> Many a times I've had to, and have seen instructions being thrown, to stop cluster, clear
out ZK and restart.
> While this is only a quick (and painful to master) fix, it is certainly nifty to some
smaller cluster users but the process is far too long, roughly:
> 1. Stop HBase
> 2. Start zkCli.sh and connect to the right quorum
> 3. Find and ensure the HBase parent znode from the configs (/hbase only by default)
> 4. Run an "rmr /hbase" in the zkCli.sh shell, or manually delete each znode if on a lower
version of ZK.
> 5. Quit zkCli.sh and start HBase again
> Perhaps it may be useful, if the start-hbase.sh itself accepted a formatZK parameter.
Such that, when you do a {{start-hbase.sh -formatZK}}, it does steps 2-4 automatically for
you.
> For safety, we could make the formatter code ensure that no HBase instance is actually
active, and skip the format process if it is. Similar to a HDFS NameNode's format, which would
disallow if the name directories are locked.
> Would this be a useful addition for administrators? Bigtop too can provide a service
subcommand that could do this.

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