[jira] [Created] (GEODE-9333) SessionsAndCrashesDUnitTest.sessionOperationsDoNotFail_whileServersAreRestarted may fail due to IndexOutOfBoundsException

["Donal Evans (Jira)" <ji...@apache.org>]

Donal Evans created GEODE-9333:
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             Summary: SessionsAndCrashesDUnitTest.sessionOperationsDoNotFail_whileServersAreRestarted may fail due to IndexOutOfBoundsException
                 Key: GEODE-9333
                 URL: https://issues.apache.org/jira/browse/GEODE-9333
             Project: Geode
          Issue Type: Bug
          Components: redis
    Affects Versions: 1.15.0
            Reporter: Donal Evans


Seen in a PR pre-checkin test run:
{noformat}
org.apache.geode.redis.session.SessionsAndCrashesDUnitTest > sessionOperationsDoNotFail_whileServersAreRestarted FAILED
    java.lang.IndexOutOfBoundsException: Index -5 out of bounds for length 100
        at jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
        at jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
        at jdk.internal.util.Preconditions.checkIndex(Preconditions.java:248)
        at java.util.Objects.checkIndex(Objects.java:372)
        at java.util.ArrayList.get(ArrayList.java:459)
        at org.apache.geode.redis.session.SessionsAndCrashesDUnitTest.validateSessionAttributes(SessionsAndCrashesDUnitTest.java:179)
        at org.apache.geode.redis.session.SessionsAndCrashesDUnitTest.sessionOperationsDoNotFail_whileServersAreRestarted(SessionsAndCrashesDUnitTest.java:170)
{noformat}
This occurs in the below block when {{totalUpdates}} is less than {{NUM_SESSIONS}}.
{code:java}
for (int i = totalUpdates - NUM_SESSIONS; i < totalUpdates; i++) {
  int sessionIdx = i % NUM_SESSIONS;
  String sessionId = sessionIds.get(sessionIdx);
...
{code}
Running the test locally with some trace logging added, it seems that {{totalUpdates}} is typically ~120, so if something were to cause updates to be 20% slower on a run of the test, this failure could show up. A solution might be to either await until at least {{NUM_SESSIONS}} updates have been performed by the updater threads, or to put in some logic to handle the case when {{totalUpdates}} is less than {{NUM_SESSIONS}}. 



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