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Posted to commits@cassandra.apache.org by "Brad Schoening (Jira)" <ji...@apache.org> on 2023/07/07 03:37:00 UTC
[jira] [Commented] (CASSANDRA-18184) 'Maximum memory usage reached' chunk cache log message doesn't specify which cache is exhausted
[ https://issues.apache.org/jira/browse/CASSANDRA-18184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17740868#comment-17740868 ]
Brad Schoening commented on CASSANDRA-18184:
--------------------------------------------
[~yongjiang] thanks so much for your work on this!
> 'Maximum memory usage reached' chunk cache log message doesn't specify which cache is exhausted
> -----------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-18184
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18184
> Project: Cassandra
> Issue Type: Bug
> Components: Observability/Logging
> Reporter: Brad Schoening
> Assignee: Yong Jiang
> Priority: Normal
> Fix For: 4.0.8, 4.1.1, 5.0
>
> Attachments: 18184-trunk.txt
>
>
> With Cassandra 4.0.x, we are seeing this cassandra.log message very frequently on the majority of our Cassandra 4.0 clusters:
> _[INFO ] [epollEventLoopGroup-5-3] cluster_id=99 ip_address=127.0.0.50 NoSpamLogger.java:92 - Maximum memory usage reached (128.000MiB), cannot allocate chunk of 8.000MiB_
> It took me several weeks to track down what it means, until I saw this start-up message
> _BufferPools.java:49 - Global buffer pool limit is 2.000GiB for chunk-cache and 128.000MiB for networking_
> This maximum memory usage warning would benefit from clarifying that its the {*}network cache{*}, not the *off-heap chunk* *cache* which is exhausted. With 'chunk cache' in both warning messages, they're too easily confused.
>
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