[infinispan-issues] [JBoss JIRA] (ISPN-2550) NoSuchElementException in Hot Rod Encoder

[Dan Berindei (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-2550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12740574#comment-12740574 ] 

Dan Berindei commented on ISPN-2550:
------------------------------------

The IndexOutOfBoundsException seems to appear because we're generating numOwners (2) "denormalized" hash ids for each segment, but the consistent hash has more than owners for one segment (3). This can happen during a join, when the write CH is a union between the previous CH and the new, balanced, CH.

Tomas, I've updated my branch to use the read CH instead, could you try again?
                
> NoSuchElementException in Hot Rod Encoder
> -----------------------------------------
>
>                 Key: ISPN-2550
>                 URL: https://issues.jboss.org/browse/ISPN-2550
>             Project: Infinispan
>          Issue Type: Bug
>          Components: Remote protocols
>    Affects Versions: 5.2.0.Beta4
>            Reporter: Michal Linhard
>            Assignee: Galder Zamarreño
>            Priority: Blocker
>             Fix For: 5.2.0.Beta6
>
>
> Tomas noticed this a while ago in a specific functional test:
> https://bugzilla.redhat.com/show_bug.cgi?id=875151
> I'm creating a more general JIRA, cause I'm having this in resilience test.
> What I found by quick debug, is that here:
> https://github.com/infinispan/infinispan/blob/master/server/hotrod/src/main/scala/org/infinispan/server/hotrod/Encoders.scala#L106
> {code}
>                for (segmentIdx <- 0 until numSegments) {
>                   val denormalizedSegmentHashIds = allDenormalizedHashIds(segmentIdx)
>                   val segmentOwners = ch.locateOwnersForSegment(segmentIdx)
>                   for (ownerIdx <- 0 until segmentOwners.length) {
>                      val address = segmentOwners(ownerIdx % segmentOwners.size)
>                      val serverAddress = members(address)
>                      val hashId = denormalizedSegmentHashIds(ownerIdx)
>                      log.tracef("Writing hash id %d for %s:%s", hashId, serverAddress.host, serverAddress.port)
>                      writeString(serverAddress.host, buf)
>                      writeUnsignedShort(serverAddress.port, buf)
>                      buf.writeInt(hashId)
>                   }
>                }
> {code}
> we're trying to obtain serverAddress for nonexistent address and NoSuchElementException is not handled properly.
> It hapens after I kill a node in a resilience test and the exception appears when querying for the node in the members cache.

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