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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7244) Provide a command or argument to startup, that formats znodes if provided
Date Tue, 09 Apr 2013 02:23:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13626132#comment-13626132
] 

Enis Soztutar commented on HBASE-7244:
--------------------------------------

Instead of this going under dev-support, can we do this as a user tool? The use case we have
come up recently was to advice the user to clean up zookeeper data before going from a secure
cluster setup to an unsecure one, hence a recommended zk wipe. I am thinking along the lines
of:
{code}
bin/hbase master --formatzk 
bin/hbase master --formatfs 
{code}
                
> 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
>            Assignee: rajeshbabu
>            Priority: Minor
>             Fix For: 0.98.0, 0.94.8, 0.95.1
>
>         Attachments: HBASE-7244_2.patch, HBASE-7244_3.patch, 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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