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Posted to commits@cassandra.apache.org by "David Capwell (Jira)" <ji...@apache.org> on 2020/06/19 00:50:00 UTC

[jira] [Commented] (CASSANDRA-15884) Add a startup check to detect if LZ4 uses java rather than native implementation

    [ https://issues.apache.org/jira/browse/CASSANDRA-15884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17140079#comment-17140079 ] 

David Capwell commented on CASSANDRA-15884:
-------------------------------------------

testing was down manually by making sure the glibc on the host was older than the one compiled against lz4-java.  When profiled saw that the Unsafe java implementation was used, but when the host glibc is new enough then Jni is used.

> Add a startup check to detect if LZ4 uses java rather than native implementation
> --------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-15884
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15884
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Dependencies
>            Reporter: David Capwell
>            Assignee: David Capwell
>            Priority: Normal
>
> In some environments the native implementation can’t link with glibc and silently falls back to java; this hurts performance.  To help warn the operators, we should add a startup check to detect this.



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