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https://issues.apache.org/jira/browse/SOLR-16414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17628111#comment-17628111
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ASF subversion and git services commented on SOLR-16414:
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Commit b33161d0cdd976fc0c3dc78c4afafceb4db671cf in solr's branch
refs/heads/branch_9x from Noble Paul
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=b33161d0cdd ]
SOLR-16414: remove parallelStream
> Race condition in PRS state updates
> -----------------------------------
>
> Key: SOLR-16414
> URL: https://issues.apache.org/jira/browse/SOLR-16414
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Noble Paul
> Assignee: Noble Paul
> Priority: Major
> Fix For: 9.1
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> For PRS collections the individual states are potentially updated from
> individual nodes and sometimes from overseer too. it's possible that
>
> # OP1 is sent to overseer at T1
> # OP2 is executed in the node itself at T2
>
> Because we cannot guarantee that the OP1 sent to overseer may execute before
> OP2 tyhe final state will be the result of OP1 which is incorrect and can
> lead to errors .
> The solution is to never do any PRS writes from overseer.
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