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Posted to commits@pulsar.apache.org by "lhotari (via GitHub)" <gi...@apache.org> on 2025/08/27 08:25:36 UTC
[I] [Bug] ZKSessionWatcher will trigger a ConnectionLost session event if query takes more than 1/15 of zk session time, causing flushing of all caches [pulsar]
lhotari opened a new issue, #24674:
URL: https://github.com/apache/pulsar/issues/24674
@gaozhangmin During a test related PR #24171 I noticed this about the same code location:
https://github.com/apache/pulsar/blob/6e8c3496647df275071190aec9d29ecbcee55e80/pulsar-metadata/src/main/java/org/apache/pulsar/metadata/impl/ZKSessionWatcher.java#L108-L115
> This will trigger a ConnectionLost session event. That's why a delay should be kept under 2000 ms.
> Currently MockZooKeeper's session timeout is hard coded to 30000ms and the check interval is 1/15 of this, therefore 2000ms.
>
> When there's a test that blocks the ZooKeeper thread for more than 2000ms, it will result in a ConnectionLost event.
> This PR makes the session timeout configurable and it's possible to increase the session timeout for tests where it's necessary to use a longer session timeout to avoid ConnectionLost session events.
This applies likewise to production code. This is problematic since the effective timeout becomes 1/15 of the zk session timeout for Pulsar operations.
Together with this change made in #23018 it will add significant load to ZooKeepers:
https://github.com/apache/pulsar/blob/829df71901de726a11bb3c8ee934d14b67ee9694/pulsar-metadata/src/main/java/org/apache/pulsar/metadata/impl/AbstractMetadataStore.java#L513-L519
I'll file a new issue about resolving this problem.
_Originally posted by @lhotari in https://github.com/apache/pulsar/issues/24624#issuecomment-3227265882_
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Re: [I] [Bug] ZKSessionWatcher will trigger a ConnectionLost session event if query takes more than 1/15 of zk session time, causing flushing of all caches [pulsar]
Posted by "lhotari (via GitHub)" <gi...@apache.org>.
lhotari commented on issue #24674:
URL: https://github.com/apache/pulsar/issues/24674#issuecomment-3227278372
@merlimat any suggestions about how to solve this issue?
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