ignite-28305 backpressure to limit in flight partition operations per…#7950
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EgorKuts wants to merge 1 commit intoapache:mainfrom
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ignite-28305 backpressure to limit in flight partition operations per…#7950EgorKuts wants to merge 1 commit intoapache:mainfrom
EgorKuts wants to merge 1 commit intoapache:mainfrom
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Before this change, a node could accept an unbounded number of partition operations, which could lead to the following problems:
Long-queued operations no longer make sense to the client by the time they are executed, forcing the node to perform useless work before it can start handling new requests.
That useless work still consumes node resources (CPU, memory, threads).
Eventually this can lead to OOM.
To prevent such scenarios, this change introduces a node-level semaphore shared across the replica manager and thin-client connector that limits the total number of concurrent partition operations to
maxInFlightPartitionOperationsPerCore * availableProcessors
When the limit is reached, new requests are rejected immediately with ReplicaOverloadedException so clients can back off, while already accepted operations complete uninterrupted.
The limit is disabled by default
(maxInFlightPartitionOperationsPerCore = 0)
Operator can start tuning this around 512 per core and adjust based on observed heap usage and rejection rate under peak load.
https://issues.apache.org/jira/browse/IGNITE-28305