[SOLR-17298] Multithreaded search breaks limits, and possibly other things - ASF JIRA

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Details

Type: Bug
Status: Closed
Priority: Blocker
Resolution: Fixed
Affects Version/s: main (10.0), 9.7, 9x
Fix Version/s: 9.7
Component/s: search
Labels:
- pull-request-available

Description

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.