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From "Edward J. Yoon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HAMA-499) Refactor clearZKNodes() in BSPMaster
Date Thu, 02 Feb 2012 01:05:53 GMT
Refactor clearZKNodes() in BSPMaster
------------------------------------

                 Key: HAMA-499
                 URL: https://issues.apache.org/jira/browse/HAMA-499
             Project: Hama
          Issue Type: Improvement
          Components: bsp
    Affects Versions: 0.4.0
            Reporter: Edward J. Yoon
             Fix For: 0.5.0


We provide Hama ZK cluster, or their own existing ZK cluster as a Hama sync service. And,
BSPMaster calls clearZKNodes() to delete all sub-nodes of 'bspRoot' in ZK cluster when it
started initially.

That code is here and very ugly.

{code}
  public void clearZKNodes() {
    try {
      for (String node : zk.getChildren(bspRoot, this)) {
        for (String subnode : zk.getChildren(bspRoot + "/" + node, this)) {
          for (String subnode2 : zk.getChildren(bspRoot + "/" + node, this)) {
            for (String subnode3 : zk.getChildren(bspRoot + "/" + node + "/" + subnode2, this))
{
              zk.delete(bspRoot + "/" + node + "/" + subnode + "/" + subnode2 + "/" + subnode3,
0);
            }
            zk.delete(bspRoot + "/" + node + "/" + subnode + "/" + subnode2, 0);
          }
          zk.delete(bspRoot + "/" + node + "/" + subnode, 0);
        }
        zk.delete(bspRoot + "/" + node, 0);
      }
    } catch (KeeperException e) {
    } catch (InterruptedException e) {
    }
  }
{code}

In this issue, we'll refactor this method. For example, you can delete recursively.

P.S., must use '-1' to delete all version of each node like this:

{code}
zk.delete(node, -1);
{code}

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