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https://issues.apache.org/jira/browse/SOLR-13050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16732434#comment-16732434
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ASF subversion and git services commented on SOLR-13050:
--------------------------------------------------------
Commit 1e735a1128256c4da7ebccd639a9d6579077aebe in lucene-solr's branch
refs/heads/branch_7x from Andrzej Bialecki
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=1e735a1 ]
SOLR-13050: Fix the test so that .system events are collected again.
> 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
> 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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