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From "zhaogang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CURATOR-168) Error 'Path must start with / character' caused by code 'setNode(event.getName());' in line 487 of LeaderLatch.class source file in which 'event.getName()' sometimes only return the last part of znode path instead of the full path.
Date Thu, 27 Nov 2014 09:20:12 GMT
zhaogang created CURATOR-168:
--------------------------------

             Summary: Error 'Path must start with / character'  caused by code 'setNode(event.getName());'
 in line 487 of LeaderLatch.class source file in which  'event.getName()' sometimes only return
the last part of znode path instead of the full path.
                 Key: CURATOR-168
                 URL: https://issues.apache.org/jira/browse/CURATOR-168
             Project: Apache Curator
          Issue Type: Bug
          Components: Recipes
    Affects Versions: 2.7.0
         Environment: operating system:ubuntu

            Reporter: zhaogang
            Priority: Blocker
             Fix For: 3.0.0, 2.7.1


We use LeaderLatch for leader election within our several zookeeper clients,but sometimes
our leaderLatch stopped to work due to a error "Background exception was not retry-able or
retry gave up java.lang.IllegalArgumentException: Path must start with / characte".

To found the reason we tracked the execution of program in class LeaderLatch with debug mode,we
found the code "setNode(event.getName());"  in line 487 of LeaderLatch.class in which "event.getName()"
code sometimes didn't return the full path of the znode but only return the last part of the
full path,like "_c_b1097329-4a77-493b-806c-5c888067eeab-latch-0000004068", but the full path
should be "api1/leaders/_c_b1097329-4a77-493b-806c-5c888067eeab-latch-0000004068".

So  the when event.getName()=="_c_b1097329-4a77-493b-806c-5c888067eeab-latch-0000004068",
the program will fail to go through the codes below:
1.LeaderLatch.checkLeadership()  line 526
2.ZKPaths.getNodeFromPath()      line 61
3.PathUtils.validatePath(path)        line 46
And then the LeaderLatch stopped to work. 




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