Harsh J created HBASE-7244:
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Summary: 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
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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