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https://issues.apache.org/jira/browse/SOLR-17294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17947377#comment-17947377
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Chris M. Hostetter commented on SOLR-17294:
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The new {{StallDetectionTest}} added by this Jira is failing ~10% of the
jenkins builds that run it...
{noformat}
Build: https://jenkins.thetaphi.de/job/Solr-main-Linux/24903/
Java: 64bit/hotspot/jdk-25-ea+15 -XX:-UseCompressedOops -XX:+UseSerialGC
1 tests failed.
FAILED:
org.apache.solr.client.solrj.impl.StallDetectionTest.testConcurrentAccess
Error Message:
java.lang.AssertionError: Exception was thrown during concurrent operation
Stack Trace:
java.lang.AssertionError: Exception was thrown during concurrent operation
at
__randomizedtesting.SeedInfo.seed([63F07F23503D1AB2:ACED402231B8E7E1]:0)
at org.junit.Assert.fail(Assert.java:89)
at org.junit.Assert.assertTrue(Assert.java:42)
at org.junit.Assert.assertFalse(Assert.java:65)
at
org.apache.solr.client.solrj.impl.StallDetectionTest.testConcurrentAccess(StallDetectionTest.java:351)
{noformat}
> The stall detection in the ConcurrentUpdateSolrClients easily detects false
> positives.
> --------------------------------------------------------------------------------------
>
> Key: SOLR-17294
> URL: https://issues.apache.org/jira/browse/SOLR-17294
> Project: Solr
> Issue Type: Bug
> Reporter: Mark Robert Miller
> Assignee: Mark Robert Miller
> Priority: Major
> Labels: pull-request-available
> Time Spent: 2h 10m
> Remaining Estimate: 0h
>
> The current stall detection mechanism in the ConcurrentUpdateSolrClients is
> prone to generating false positives, especially under load. As pointed out by
> Jason, the existing approach simply intermittently monitors the queue size
> over time to detect stalls. However, this method is insufficient because the
> queue can report being full for extended periods when the system is under
> load, even if no actual stall has occurred.
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