[jira] [Created] (HBASE-8396) balancerSwitch making two zookeeper calls everytime.

["rajeshbabu (JIRA)" <ji...@apache.org>]

rajeshbabu created HBASE-8396:
---------------------------------

             Summary: balancerSwitch making two zookeeper calls everytime.
                 Key: HBASE-8396
                 URL: https://issues.apache.org/jira/browse/HBASE-8396
             Project: HBase
          Issue Type: Bug
          Components: Balancer
            Reporter: rajeshbabu
            Assignee: rajeshbabu
             Fix For: 0.98.0, 0.95.2


first time on balancerSwitch we will create balancerZnode.
from second time onwards we will try to create node(1st time) which will fail with NodeExistsException then we will call setData(2nd time).
{code}
    try {
      ZKUtil.createAndWatch(watcher, watcher.balancerZNode, upData);
    } catch(KeeperException.NodeExistsException nee) {
      ZKUtil.setData(watcher, watcher.balancerZNode, upData);
    }
{code}

We can change as below to avoid extra zk call from second time onwards.
{code}
    try {
      ZKUtil.setData(watcher, watcher.balancerZNode, upData);
    } catch(KeeperException.NoNodeException nne) {
      ZKUtil.createAndWatch(watcher, watcher.balancerZNode, upData);
    }
{code}

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