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https://issues.apache.org/jira/browse/HBASE-1144?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nitay Joffe updated HBASE-1144:
-------------------------------
Attachment: overview.patch
Updates to the overview.html documentation.
While writing this and thinking about Stack's comments I realized that our
current system for configuring ZooKeeper is too complicated.
We have certain pieces of information which needs to be duplicated in zoo.cfg,
zookeepers, and hbase-site.xml.
>From my example in the documentation:
zoo.cfg:
tickTime=2000
dataDir=/var/zookeeper
clientPort=2181
initLimit=5
syncLimit=2
server.1=zoo1:2888:3888
server.2=zoo2:2888:3888
server.3=zoo3:2888:3888
zookeepers:
zoo1
zoo2
zoo3
hbase-site.xml:
<configuration>
...
<property>
<name>zookeeper.servers</name>
<value>zoo1:2181,zoo2:2181,zoo3:2181</value>
<description>The host and port that the ZooKeeper quorum servers run at.
</description>
</property>
...
</configuration>
Specifically, the list of quorum servers in zoo.cfg is written to the
zookeepers file so that HBase can start/stop the daemons on remote nodes. In
hbase-site.xml we put the host1:port,host2:port list of quorum servers so that
clients know who to talk to.
Instead, I think we should get rid of the zookeepers file and the
zookeeper.servers option in hbase-site.xml and rely solely on zoo.cfg. We do
not need to change/add any options to zoo.cfg, it remains strictly a ZooKeeper
configuration file, but we can parse everything we need out of it.
The zookeepers file is simply the host part of the server.X lines. The
zookeeper.servers option in hbase-site.xml is the hosts with the clientPort
appended to them.
The only reason I can think of to keep it separated is in cases where we want
HBase to use some existing ZooKeeper cluster which would mean leaving the
zookeepers file empty. I think this case can be controlled with some new
boolean option in hbase-site.xml (defaulting to true) which tells HBase whether
to try starting/stopping ZooKeeper.
Thoughts?
> Store the ROOT region location in Zookeeper
> -------------------------------------------
>
> Key: HBASE-1144
> URL: https://issues.apache.org/jira/browse/HBASE-1144
> Project: Hadoop HBase
> Issue Type: Sub-task
> Reporter: Jean-Daniel Cryans
> Assignee: Nitay Joffe
> Attachments: hbase-1144.patch, overview.patch
>
>
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