[jira] [Commented] (ACCUMULO-4163) ZooZap should deal with /tracers being missing

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

    [ https://issues.apache.org/jira/browse/ACCUMULO-4163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15432855#comment-15432855 ] 

Christopher Tubbs commented on ACCUMULO-4163:
---------------------------------------------

This relates to ACCUMULO-4415, in that it's another area where some Accumulo server code is intermingled with the Tracer client service advertisement area in ZooKeeper.

> ZooZap should deal with /tracers being missing
> ----------------------------------------------
>
>                 Key: ACCUMULO-4163
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4163
>             Project: Accumulo
>          Issue Type: Bug
>          Components: zookeeper
>    Affects Versions: 1.7.1
>            Reporter: Josh Elser
>            Assignee: Dave Marion
>            Priority: Minor
>             Fix For: 1.6.6, 1.7.3, 1.8.1
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> {noformat}
> 2016-03-14 16:57:15,316 [util.ZooZap] ERROR: Exception running zapDirectory.
> org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /tracers
> 	at org.apache.zookeeper.KeeperException.create(KeeperException.java:111)
> 	at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
> 	at org.apache.zookeeper.ZooKeeper.getChildren(ZooKeeper.java:1532)
> 	at org.apache.zookeeper.ZooKeeper.getChildren(ZooKeeper.java:1560)
> 	at org.apache.accumulo.fate.zookeeper.ZooReader.getChildren(ZooReader.java:151)
> 	at org.apache.accumulo.server.util.ZooZap.zapDirectory(ZooZap.java:117)
> 	at org.apache.accumulo.server.util.ZooZap.main(ZooZap.java:110)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:606)
> 	at org.apache.accumulo.start.Main$2.run(Main.java:130)
> 	at java.lang.Thread.run(Thread.java:745)
> {noformat}
> This shouldn't be an error that is propagated to the user to see. We should know that it's ok if '/tracers' doesn't exist and move on silently



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