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Unlimited high concurrent access to TiFlash may make TiFlash crash when using dynamic partition prune mode #35864

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windtalker opened this issue Jun 30, 2022 · 1 comment
Open

Unlimited high concurrent access to TiFlash may make TiFlash crash when using dynamic partition prune mode #35864

windtalker opened this issue Jun 30, 2022 · 1 comment
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sig/execution SIG execution type/enhancement

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@windtalker
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Enhancement

In TiDB, when dynamic partition prune mode is enabled, and if there is a full table scan for a partition table in TiFlash, assuming the partition table has n partitions, and if TiDB access TiFlash in cop mode, then the accessing concurrency will be
n * dist_scan_concurrency
That is to say the accessing concurrency will increase linearly if the total partition number increase. These unlimited high concurrent access to TiFlash may make TiFlash crash, we need find a way to limit the overall accessing concurrency.
@SeaRise
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SeaRise commented Mar 13, 2023

Maybe pingcap/tiflash#6394 alleviates the problem

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@windtalker @SeaRise