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Posted to dev@lucene.apache.org by "Andrzej Bialecki (JIRA)" <ji...@apache.org> on 2019/01/07 11:17:00 UTC
[jira] [Resolved] (SOLR-13050) SystemLogListener can "lose" record
of nodeLost event when node lost is/was .system collection leader
[ https://issues.apache.org/jira/browse/SOLR-13050?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Andrzej Bialecki resolved SOLR-13050.
--------------------------------------
Resolution: Fixed
Fix Version/s: 7.7
master (8.0)
> SystemLogListener can "lose" record of nodeLost event when node lost is/was .system collection leader
> -----------------------------------------------------------------------------------------------------
>
> Key: SOLR-13050
> URL: https://issues.apache.org/jira/browse/SOLR-13050
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Hoss Man
> Assignee: Andrzej Bialecki
> Priority: Major
> Fix For: master (8.0), 7.7
>
> Attachments: SOLR-13050.test-workaround.patch, jenkins.sarowe__Lucene-Solr-tests-7.x__7104.log.txt
>
>
> A chicken/egg issue of the way the autoscaling SystemLogListener uses the {{.system}} collection to record event history is that in the case of a {{nodeLost}} event for the {{.system}} collection's leader, there is a window of time during leader election where trying to add the "Document" representing that {{nodeLost}} event to the {{.system}} collection can fail.
> This isn't a silently failure: the SystemLogListener, acting the role of a Solr client, is informed that the "add" failed, but it doesn't/can't do much to deal with this situation other then to "log" (to the slf4j Logger) that it wasn't able to add the doc.
> ----
> I'm not sure how much of a "real world" impact this has on users, but I noticed the issue while diagnosing a jenkins test failure and wanted to track it.
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