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https://issues.apache.org/jira/browse/CASSANDRA-15767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17094719#comment-17094719
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David Capwell commented on CASSANDRA-15767:
-------------------------------------------
I reviewed the usage and I believe its ok to switch the .1 search to .2. We
only use it for LD_PRELOAD which lets us swap malloc for jemalloc, we don't
appear to use any of the binary interface so shouldn't be impacted by API
changes there. Doing this would only resolve "WARN [main] 2020-04-27
14:54:34,113 StartupChecks.java:136 - jemalloc shared library could not be
preloaded to speed up memory allocations".
jemalloc is used for our native memory allocations as it makes sure we use less
memory than normal malloc. Allocations are also expected to be faster with it.
You can run Apache Cassandra without it but its always better to use jemalloc
than not.
> /usr/bin/cassandra looking for wrong libjemalloc.so file
> --------------------------------------------------------
>
> Key: CASSANDRA-15767
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15767
> Project: Cassandra
> Issue Type: Bug
> Components: Local/Scripts
> Reporter: Brian Bellrose
> Priority: Normal
>
> In /usr/sbin/cassandra
> Linux)
> if [ -z $CASSANDRA_LIBJEMALLOC ] ; then
> which ldconfig > /dev/null 2>&1
> if [ $? = 0 ] ; then
> # e.g. for CentOS
> dirs="/lib64 /lib /usr/lib64 /usr/lib `ldconfig -v 2>/dev/null | grep -v
> '^\s' | sed 's/^\([^:]*\):.*$/\1/'`"
> else
> # e.g. for Debian, OpenSUSE
> dirs="/lib64 /lib /usr/lib64 /usr/lib `cat /etc/ld.so.conf
> /etc/ld.so.conf.d/*.conf | grep '^/'`"
> fi
> dirs=`echo $dirs | tr " " ":"`
> CASSANDRA_LIBJEMALLOC=$(find_library '.*/libjemalloc\.so\(\.1\)*' $dirs)
>
> However...
> # find /usr/lib64 -name "*jemalloc*"
> /usr/lib64/libjemalloc.so.2
>
>
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