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From "Nitay Joffe (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-1606) Remove zoo.cfg, put config options into hbase-site.xml
Date Thu, 02 Jul 2009 18:45:47 GMT
Remove zoo.cfg, put config options into hbase-site.xml
------------------------------------------------------

                 Key: HBASE-1606
                 URL: https://issues.apache.org/jira/browse/HBASE-1606
             Project: Hadoop HBase
          Issue Type: Sub-task
    Affects Versions: 0.20.0
            Reporter: Nitay Joffe
            Assignee: Nitay Joffe
             Fix For: 0.20.0


>From HBASE-1551:

Here's my current thinking:

    * Move all of the ZooKeeper config paraments into hbase-*.xml using zookeeper.property.KEY
= VALUE.
    * Add a special property for the list of quorum servers, say zookeeper.quorum. This option
can default to "localhost".
    * If there is a zoo.cfg present in the classpath, use its data above the zookeeper.property.KEY
options.
    * When we need to instantiate something to talk to ZooKeeper, we simply create a new HBaseConfiguration
and call some method on it e.g. toZooKeeperProperties().
      This method will iterate through the zookeeper.property.KEY and turn each into the appropriate
ZooKeeper configurations (i.e. KEY=VALUE). It will generate
      the server.X property from the zookeeper.quorum configuration option. As mentioned above,
if there is a zoo.cfg in the classpath, overwrite the data with its configuration.
      This will return a Properties object that can be used to construct the appropriate ZooKeeper
config and start/talk to their servers.
    * For start/stop management of full ZK quorum cluster, use something like my ZKServerTool
in the patch (modified of course) to do the parsing mentioned above and turn it
      into a simple line-by-line list of quorum servers. As I do in this patch, the bin/zookeepers.sh
can then simply call bin/hbase o.a.h.h.z.ZKServerTool to get the list of hosts.
      If you want something like a conf/zookeepers you can simply run ZKServerTool yourself.

The benefits from all this are:

    * One place for all ZK configuration. No duplicate setting of parameters.
    * No more nasty zoo.cfg. Give the user what they're already used to, a single XML config
file.
    * New user only need edit zookeeper.quorum to get full cluster.
    * Programmable control of what ZK one is talking to.


And some of Stack's comments:

@nitay, I think you need to keep the hbase zookeeper config inside of an hbase namespace.
The Hadoop Configuation system is a floozy. It will go with anyone who calls load resource
on it pulling in their properties. I could see that out on a MR task, the Configuration could
have all kinds of pollution in it. Would suggest an hbase prefix - hbase.zookeeper prefix?

@nitay on "if zoo.cfg in the CLASSPATH", that might work. We might want to try narrow the
places we look on the CLASSPATH. But lets start open and narrow later (we probably want this
to be open as possible at mo. until we learn more about the cloudera config.)

@nitay on toZooKeeperProperties, do we have to expose that? Can't we just pass a HBaseConfiguation
to the HBase ZK Wrapper (I'm not up on latest dev here so this might be an off suggestion)


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