[jira] [Reopened] (SOLR-16414) Race condition in PRS state updates

["Ishan Chattopadhyaya (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-16414?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ishan Chattopadhyaya reopened SOLR-16414:
-----------------------------------------

The last commit caused a massive slowdown in node stop event. With 1000 cores/node, the nodes never gracefully stopped, had to be kill -9'd. Repoening for a fix to remove parallelStream usage.

> 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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