[infinispan-issues] [JBoss JIRA] Commented: (ISPN-1086) IndexOutOfBoundsException for DistributedExecutorService with a single node cache

[Ming Fai Ma (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-1086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12600142#comment-12600142 ] 

Ming Fai Ma commented on ISPN-1086:
-----------------------------------

i patched my local infinispan to make 

{code}
   public void execute(Runnable command) {
...
          Address randomClusterMemberOtherThanSelfAddress = randomClusterMemberOtherThanSelf();
         if (randomClusterMemberOtherThanSelfAddress!=null) executeFuture(randomClusterMemberOtherThanSelf(), cmd);
...
{code}

and 
{code}
protected Address randomClusterMemberOtherThanSelf() {
     List<Address> l = randomClusterMembers(1);
     return l!=null && l.size()>0?l.get(0):null;
   }
{code}

The IndexOutOfBoundsException won't be thrown anymore but the task still won't run. the log say:
2011-05-06 01:14:45,980 WARN  [DefaultExecutorService        ]    ISPN00008: Can not select 1 random members for []

the same DistributedCallable does work if i use submitEverywhere

so my question is, should the submit() method just send the local node if there is only one node in the cluster?

> IndexOutOfBoundsException for DistributedExecutorService with a single node cache
> ---------------------------------------------------------------------------------
>
>                 Key: ISPN-1086
>                 URL: https://issues.jboss.org/browse/ISPN-1086
>             Project: Infinispan
>          Issue Type: Bug
>          Components: Distributed Cache
>    Affects Versions: 5.0.0.CR1
>            Reporter: Ming Fai Ma
>            Assignee: Manik Surtani
>            Priority: Minor
>
> I'm just trying the distributed executor in 5.0.0.CR1. My first test is to start a cache with one member only (but with clustered cache configuration as it is required). When I submitted a runnable in to a DistributedExecutorService with a single node, it got an error:
> {code}
>   java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
>      	at java.util.ArrayList.RangeCheck(ArrayList.java:547)
>      	at java.util.ArrayList.get(ArrayList.java:322)
>      	at org.infinispan.distexec.DefaultExecutorService.randomClusterMemberOtherThanSelf(DefaultExecutorService.java:451)
>      	at org.infinispan.distexec.DefaultExecutorService.execute(DefaultExecutorService.java:278)
> {code}
> there is only one member and no "cluster member other than self". Should the single node use case be supported? I suppose there is no harm to allow user to use the executor in a single node, for example, for unit testing. 
> if this use case is not supported, I suggest to throw an exception with better explanation

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