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https://issues.apache.org/jira/browse/SOLR-17298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17873447#comment-17873447
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ASF subversion and git services commented on SOLR-17298:
--------------------------------------------------------
Commit 84d1fbc45e173b3da268215e77c1c8cf7af84c78 in solr's branch
refs/heads/branch_9x from Christine Poerschke
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=84d1fbc45e1 ]
SOLR-13350, SOLR-17298: use multiThreaded=false default; document multiThreaded
parameter; (#2596)
Co-authored-by: Gus Heck <g...@apache.org>
(cherry picked from commit 7ebbcd3493cc5658ad86480906813144125fbc43)
> Multithreaded search breaks limits, and possibly other things
> -------------------------------------------------------------
>
> Key: SOLR-17298
> URL: https://issues.apache.org/jira/browse/SOLR-17298
> Project: Solr
> Issue Type: Bug
> Components: search
> Affects Versions: main (10.0), 9.7, 9x
> Reporter: Gus Heck
> Assignee: Gus Heck
> Priority: Blocker
> Labels: pull-request-available
> Fix For: 9.7
>
> Time Spent: 2h 50m
> Remaining Estimate: 0h
>
> https://issues.apache.org/jira/browse/SOLR-13350 was merged to main somewhat
> unexpectedly, and then back-ported to 9x without any response to feedback
> from multiple committers, including feedback that
> * By turning it on by default, it breaks the recently released CPU limits
> (as shown by changes to unit tests).
> * Incompatibility with timeAllowed, cpuTimeAllowed, segmentTerminateEarly,
> GraphQuery, RankQuery and JoinQuery was not clearly documented
> I have not verified it yet, but I would also be worried about the health of
> CPU time logging to be added in
> https://issues.apache.org/jira/browse/SOLR-16986 after this change.
> Given that:
> * Some of the above issues represent back compatibility breaks or potential
> back compatibility breaks for released features
> * The decision to break compatibility within the 9x release series deserves
> a formal vote (or a fix).
> * There has been no communication/response from the committer who merged
> these changes since May 6 (aside from the backport to 9x on May 13) it seems
> that this state may persist for some time.
> Therefore it appears necessary to file this issue to ensure anything but a
> 9.6.1 is blocked until the above issues are sorted out. This ticket can serve
> as a parent ticket to whatever various solutions are agreed upon.
> Multi-threaded search is an awesome feature that has taken a very long time
> to be realized and is obviously desirable, but we have now placed ourselves
> in an awkward position by not resolving these last few issues before back
> porting.
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