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https://issues.apache.org/jira/browse/CASSANDRA-18770?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17755202#comment-17755202
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vaibhav khedkar commented on CASSANDRA-18770:
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yes java is holding these open.
We do not have any in-jvm monitoring and nothing else runs the same JVM except
for C*.
The weird part is it only happens after we upgrade to 4.0.5, in the same VM
with same JVM settings, we are not seeing this issue before upgrade.
> Open File Descriptors not cleared post upgrade from 3.11.9 to 4.0.5
> -------------------------------------------------------------------
>
> Key: CASSANDRA-18770
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18770
> Project: Cassandra
> Issue Type: Bug
> Reporter: vaibhav khedkar
> Priority: Normal
>
> We recently upgraded our fleet of ~2500 Cassandra instances from 3.11.9 to
> 4.0.5.
> After the upgrade, we are seeing a unique issue where the compacted
> SSTables's file descriptors are still present and are never cleared. This is
> causing false disk alerts. We have to restart nodes very often in order to
> reclaim the disk space.
> We use the *Apache* version of C* along with CentOS Linux 7.9.2009 and Java 8.
> We are seeing it for all the tables (Filter, Data ..etc ) when checked with
> `lsof` command
> <path>/nb-1-big-Statistics.db.tmp (deleted)
> <path>/nb-3-big-Statistics.db.tmp (deleted)
> <path>/nb-2-big-Data.db (deleted)
> <path>/nb-2-big-Statistics.db.tmp (deleted)
> <path>/nb-2-big-Index.db (deleted)
> <path>/nb-2-big-Statistics.db.tmp (deleted)
> <path>/nb-2-big-CompressionInfo.db (deleted)
> <path>/nb-2-big-Filter.db (deleted)
> <path>/nb-2-big-Summary.db (deleted)
> <path>/nb-2-big-Digest.crc32 (deleted)
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