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From "Liyin Tang (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-4568) Make zk dump jsp response more quickly
Date Mon, 10 Oct 2011 19:52:30 GMT
Make zk dump jsp response more quickly

                 Key: HBASE-4568
                 URL: https://issues.apache.org/jira/browse/HBASE-4568
             Project: HBase
          Issue Type: Improvement
            Reporter: Liyin Tang
            Assignee: Liyin Tang

For each zk dump, currently hbase will create a zk client instance every time. 
This is quite slow when any machines in the quorum is dead. Because it will connect to each
machine in the zk quorum again.

  HMaster master = (HMaster)getServletContext().getAttribute(HMaster.MASTER);
  Configuration conf = master.getConfiguration();
  HBaseAdmin hbadmin = new HBaseAdmin(conf);
  HConnection connection = hbadmin.getConnection();
  ZooKeeperWatcher watcher = connection.getZooKeeperWatcher();

So we can simplify this:
  HMaster master = (HMaster)getServletContext().getAttribute(HMaster.MASTER);
  ZooKeeperWatcher watcher = master.getZooKeeperWatcher();

Also when hbase call getServerStats() for each machine in the zk quorum, it hard coded the
default time out as 1 min. 
It would be nice to make this configurable and set it to a low time out.

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