[jira] [Updated] (CASSANDRA-17780) libjemalloc2 is not detected by cassandra script

["Stefan Miklosovic (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-17780?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stefan Miklosovic updated CASSANDRA-17780:
------------------------------------------
     Bug Category: Parent values: Code(13163)
       Complexity: Normal
    Discovered By: Adhoc Test
         Severity: Normal
           Status: Open  (was: Triage Needed)

> libjemalloc2 is not detected by cassandra script
> ------------------------------------------------
>
>                 Key: CASSANDRA-17780
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-17780
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Local/Scripts
>            Reporter: Stefan Miklosovic
>            Assignee: Stefan Miklosovic
>            Priority: Normal
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> I noticed that there was this log message when I started a Cassandra node on a machine in AWS on Ubuntu Jelly (22.04).
> Hence, I went ahead and I tried to install that package, on 22.04, 
> {code:java}
> $ apt search libjemalloc
> Sorting... Done
> Full Text Search... Done
> libjemalloc-dev/jammy 5.2.1-4ubuntu1 amd64
>     development files and documentation for jemalloc
> libjemalloc2/jammy,now 5.2.1-4ubuntu1 amd64
>     general-purpose scalable concurrent malloc(3) implementation {code}
> So I did apt install libjemalloc2.
> But the problems didnt go away because cassandra script didnt recognised it. The value of JVM property the jemalloc startup check is reading from is an environment property called CASSANDRA_LIBJEMALLOC (1) which is set by us looking into various library paths, trying to find "libjemalloc.so.1"(2). But there is no "1" version of it. We have version "2".
> {code:java}
> $ sudo dpkg -L libjemalloc2
> /.
> /usr
> /usr/lib
> /usr/lib/x86_64-linux-gnu
> /usr/lib/x86_64-linux-gnu/libjemalloc.so.2  <---- our tasty libjemalloc
> /usr/share
> /usr/share/doc
> /usr/share/doc/libjemalloc2
> /usr/share/doc/libjemalloc2/README
> /usr/share/doc/libjemalloc2/changelog.Debian.gz
> /usr/share/doc/libjemalloc2/copyright{code}
> (1) [https://github.com/apache/cassandra/blob/cassandra-4.0/bin/cassandra#L160]
> (2) [https://github.com/apache/cassandra/blob/cassandra-4.0/bin/cassandra#L157]
> I checked what Debian is offering and Bullseye and Buster do not have libjemalloc1 anymore, they have version 2, 1 is gone. Strech and Jessie have version 1 and not 2 (obviously). Ubuntu Jelly has 2, I am not sure when they started to ship 2 instead of 1 but I assume that if a user runs Cassandra on "anything recent", this is broken, jemalloc is not used and I thing that performance can suffer quite significantly.
> This logic is present from 3.0 onwards.
> The patch should fix this and it should take both versions into account. I will provide patch with my solution shortly.



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