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[Enhancement] only call getAliveComputeNodes once per OlapScanNode #52168
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Signed-off-by: Connor Brennan <[email protected]>
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only call getAliveComputeNodes once per query
[BugFix] only call getAliveComputeNodes once per query
Oct 21, 2024
ctbrennan
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[BugFix] only call getAliveComputeNodes once per query
[BugFix] only call getAliveComputeNodes once per OlapScanNode
Oct 22, 2024
ctbrennan
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[BugFix] only call getAliveComputeNodes once per OlapScanNode
[Enhancement] only call getAliveComputeNodes once per OlapScanNode
Oct 22, 2024
kevincai
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Quality Gate passedIssues Measures |
[Java-Extensions Incremental Coverage Report]✅ pass : 0 / 0 (0%) |
[BE Incremental Coverage Report]✅ pass : 0 / 0 (0%) |
[FE Incremental Coverage Report]✅ pass : 11 / 11 (100.00%) file detail
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wyb
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@Mergifyio backport branch-3.3 |
@Mergifyio backport branch-3.2 |
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…52168) Signed-off-by: Connor Brennan <[email protected]> (cherry picked from commit f581449)
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…52168) Signed-off-by: Connor Brennan <[email protected]> (cherry picked from commit f581449) # Conflicts: # fe/fe-core/src/main/java/com/starrocks/planner/OlapScanNode.java # fe/fe-core/src/test/java/com/starrocks/server/WarehouseManagerTest.java
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…ackport #52168) (#52267) Co-authored-by: Connor Brennan <[email protected]>
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Why I'm doing:
I found some queries which were slow (order of 3-5 seconds) which were bottlenecked in the frontend. Their query profiles indicated that much of the query execution time was spent planning. I did some jstack profiling of the frontends while sending this type of query, see jstack_example9.txt for an example of the profile. The takeaway is that the large majority of threads were busy doing
WarehouseManager.getAliveComputeNodes
fromOlapScanNode.addScanRangeLocations
, just to check if there are any living compute nodes. This is done once perPhysicalPartition
, even though the check for living CN is not parameterized by anything other than warehouse id. This is wasteful and seriously slow when there are large partition/tablet counts. We can eliminate this bottleneck.What I'm doing:
Ensuring that
getAliveComputeNodes
is called once per instance of OlapScanNode (once per query).This can be seen as a follow up to #46913
Fixes #issue
What type of PR is this:
This is a fix for a performance issue, which I'll call an enhancement.
Does this PR entail a change in behavior?
If yes, please specify the type of change:
Checklist:
Bugfix cherry-pick branch check: