[9.0] Threadpool merge executor does not block aborted merges (#129613) #129727
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This PR addresses a bug where aborted merges are blocked if there's insufficient disk space. Previously, the merge disk space estimation did not consider if the operation has been aborted when/while it was enqueued for execution. Consequently, aborted merges, for e.g. when closing a shard, were blocked if their disk space estimation was exceeding the available disk space threshold. In this case, the shard close operation would itself block. This fix estimates a disk space budget of `0` for aborted merges, and it periodically checks if any enqueued merge tasks have been aborted (more generally, it checks if the budget estimate for any merge tasks has changed, and reorders the queue if so). This way aborted merges are prioritized and are never blocked. Closes elastic#129335
albertzaharovits
added
>non-issue
:Distributed Indexing/Engine
albertzaharovits
deleted the
backport-90-consider-aborting-merges-while-enqueued
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This PR addresses a bug where aborted merges are blocked if there's insufficient disk space.
Previously, the merge disk space estimation did not consider if the operation has been aborted when/while it was enqueued for execution. Consequently, aborted merges, for e.g. when closing a shard, were blocked if their disk space estimation was exceeding the available disk space threshold. In this case, the shard close operation would itself block.
This fix estimates a disk space budget of
0for aborted merges, and it periodically checks if any enqueued merge tasks have been aborted (more generally, it checks if the budget estimate for any merge tasks has changed, and reorders the queue if so). This way aborted merges are prioritized and are never blocked.Closes #129335
Backport of #129613