GitHub user liu-zhaokun opened a pull request:

    https://github.com/apache/spark/pull/18108

    [SPARK-20884] Spark' masters will be both standby due to the bug of curator

    
[https://issues.apache.org/jira/browse/SPARK-20884](https://issues.apache.org/jira/browse/SPARK-20884)
    I built a cluster with two masters and three workers.When there is a switch 
of master's state,two masters are both standby in a long period.There are some 
ERROR in master's logfile " ERROR CuratorFrameworkImpl: Background exception 
was not retry-able or retry gave up
    java.lang.IllegalArgumentException: Path must start with / character
    at org.apache.curator.utils.PathUtils.validatePath(PathUtils.java:53)
    at org.apache.curator.utils.ZKPaths.getNodeFromPath(ZKPaths.java:56)
    at 
org.apache.curator.framework.recipes.leader.LeaderLatch.checkLeadership(LeaderLatch.java:421)
    at 
org.apache.curator.framework.recipes.leader.LeaderLatch.access$500(LeaderLatch.java:60)
    at 
org.apache.curator.framework.recipes.leader.LeaderLatch$6.processResult(LeaderLatch.java:478)
    at 
org.apache.curator.framework.imps.CuratorFrameworkImpl.sendToBackgroundCallback(CuratorFrameworkImpl.java:686)
    at 
org.apache.curator.framework.imps.CuratorFrameworkImpl.processBackgroundOperation(CuratorFrameworkImpl.java:485)
    at 
org.apache.curator.framework.imps.GetChildrenBuilderImpl$2.processResult(GetChildrenBuilderImpl.java:166)
    at 
org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:587)
    at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:495)"
    it can be related to https://issues.apache.org/jira/browse/CURATOR-168.
    So I think the version of curator in spark should be 2.8.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/liu-zhaokun/spark master_curator

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/spark/pull/18108.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #18108
    
----
commit fcf66eb0b9ca53dd604de49d9329092b5e5620b1
Author: liuzhaokun <liu.zhao...@zte.com.cn>
Date:   2017-05-25T12:00:41Z

    [SPARK-20884] Spark' masters will be both standby due to the bug of curator

----


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