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https://issues.apache.org/jira/browse/IGNITE-23502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17893742#comment-17893742
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Philipp Shergalis commented on IGNITE-23502:
--------------------------------------------
Caused by Garbage Collection, case closed
I.e. holding lock for 490MS → there was a GC event with duration 488MS at the
same time. Happens in different threads simultaneously, with the same duration
and in different methods
> Long (100-300ms) read lock inserting a value under high load in aipersist
> -------------------------------------------------------------------------
>
> Key: IGNITE-23502
> URL: https://issues.apache.org/jira/browse/IGNITE-23502
> Project: Ignite
> Issue Type: Bug
> Reporter: Philipp Shergalis
> Assignee: Philipp Shergalis
> Priority: Major
> Labels: ignite-3
>
> Under high load even inserting 1 value in aipersist we *sometimes* hold read
> lock for 100-300ms
> Can be reproduced running UpsertKvBenchmark on labs server, branch
> i{{{}gnite-22835-phil{}}} on 3ab6379da866fc5afac336bca53a6f4731025638 commit
> (just added some logging to branch ignite-22835-2)
>
> There are 123 entries in log for cases when we hold a lock for more than 100
> ms. Examples:
> {code:java}
> [2024-10-18T10:07:12,109][WARN
> ][org.apache.ignite.internal.benchmark.UpsertKvBenchmark.upsert-jmh-worker-6][PersistentPageMemoryMvPartitionStorage]
> LONG READ LOCK 145 IN handleUpdate
> [2024-10-18T10:07:12,518][WARN
> ][org.apache.ignite.internal.benchmark.UpsertKvBenchmark.upsert-jmh-worker-12][PersistentPageMemoryMvPartitionStorage]
> LONG READ LOCK 123 IN handleUpdate
> [2024-10-18T10:07:12,518][WARN
> ][org.apache.ignite.internal.benchmark.UpsertKvBenchmark.upsert-jmh-worker-16][PersistentPageMemoryMvPartitionStorage]
> LONG READ LOCK 123 IN handleUpdate
> [2024-10-18T10:07:12,518][WARN
> ][org.apache.ignite.internal.benchmark.UpsertKvBenchmark.upsert-jmh-worker-1][PersistentPageMemoryMvPartitionStorage]
> LONG READ LOCK 121 IN handleUpdate
> [2024-10-18T10:07:12,518][WARN
> ][org.apache.ignite.internal.benchmark.UpsertKvBenchmark.upsert-jmh-worker-2][PersistentPageMemoryMvPartitionStorage]
> LONG READ LOCK 122 IN handleUpdate
> Iteration 6: [2024-10-18T10:07:15,020][WARN
> ][org.apache.ignite.internal.benchmark.UpsertKvBenchmark.upsert-jmh-worker-4][PersistentPageMemoryMvPartitionStorage]
> LONG READ LOCK 254 IN handleUpdate
> [2024-10-18T10:07:15,020][WARN
> ][org.apache.ignite.internal.benchmark.UpsertKvBenchmark.upsert-jmh-worker-10][PersistentPageMemoryMvPartitionStorage]
> LONG READ LOCK 254 IN handleUpdate
> [2024-10-18T10:07:15,020][WARN
> ][org.apache.ignite.internal.benchmark.UpsertKvBenchmark.upsert-jmh-worker-11][PersistentPageMemoryMvPartitionStorage]
> LONG READ LOCK 254 IN handleUpdate
> [2024-10-18T10:07:15,020][WARN
> ][org.apache.ignite.internal.benchmark.UpsertKvBenchmark.upsert-jmh-worker-14][PersistentPageMemoryMvPartitionStorage]
> LONG READ LOCK 254 IN handleUpdate
> [2024-10-18T10:07:15,020][WARN
> ][org.apache.ignite.internal.benchmark.UpsertKvBenchmark.upsert-jmh-worker-2][PersistentPageMemoryMvPartitionStorage]
> LONG READ LOCK 254 IN handleUpdate
> [2024-10-18T10:07:15,020][WARN
> ][org.apache.ignite.internal.benchmark.UpsertKvBenchmark.upsert-jmh-worker-8][PersistentPageMemoryMvPartitionStorage]
> LONG READ LOCK 254 IN handleUpdate
> [2024-10-18T10:07:23,820][WARN
> ][org.apache.ignite.internal.benchmark.UpsertKvBenchmark.upsert-jmh-worker-5][PersistentPageMemoryMvPartitionStorage]
> LONG READ LOCK 188 IN handleUpdate{code}
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