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Suresh Srinivas commented on HDFS-2681: --------------------------------------- Really nice job with the tests. May be you can also create a real ZK based test. This could be done in another jira. Here are the comments: Comments: # Please use System.arraycopy() instead of byte[] clone. # Split process into two different methods processZkEvent and processZnodeEvent? # Test # Change the method name to init(). Annotate it @Before. It will be automatically called before tests. # Use @Expected for tests that expect exception # Add class level javadoc. # #Init need not catch IOException. Just throw it. The test will fail. # You can reduce several lines of code by using a static byte[] DATA; # can you add test where jointElection() is called twice and the second call is NO-OP # Many times where processResult is called back to back can be in for loop # Why should 4 errors of connection loss result in fatalError? # testStatNodeError already covers some part of testCreateNodeResultRetryBecomeActive # Instead of catching InterruptedException, you can just throw it > Add ZK client for leader election > --------------------------------- > > Key: HDFS-2681 > URL: https://issues.apache.org/jira/browse/HDFS-2681 > Project: Hadoop HDFS > Issue Type: Sub-task > Components: ha > Affects Versions: HA branch (HDFS-1623) > Reporter: Suresh Srinivas > Assignee: Bikas Saha > Fix For: HA branch (HDFS-1623) > > Attachments: HDFS-2681.HDFS-1623.patch, HDFS-2681.HDFS-1623.patch, > HDFS-2681.HDFS-1623.patch, Zookeeper based Leader Election and Monitoring > Library.pdf > > > ZKClient needs to support the following capabilities: > # Ability to create a znode for co-ordinating leader election. > # Ability to monitor and receive call backs when active znode status changes. > # Ability to get information about the active node. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira