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Posted to commits@cassandra.apache.org by "Bowen Song (Jira)" <ji...@apache.org> on 2021/09/25 16:56:00 UTC
[jira] [Commented] (CASSANDRA-16839) Truncation snapshots
unnecessarily created on node startup
[ https://issues.apache.org/jira/browse/CASSANDRA-16839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17420128#comment-17420128 ]
Bowen Song commented on CASSANDRA-16839:
----------------------------------------
I can confirm that I'm experiencing the same issue on a Cassandra 4.0.1 cluster on production. New snapshot is created for those system tables when the server is rebooted or the Cassandra service is restarted. The size of the snapshot is small, but if left untreated, the filesystem may run out of free inodes eventually.
> Truncation snapshots unnecessarily created on node startup
> ----------------------------------------------------------
>
> Key: CASSANDRA-16839
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16839
> Project: Cassandra
> Issue Type: Bug
> Components: Tool/nodetool
> Reporter: Paulo Motta
> Priority: Normal
> Fix For: 4.0.x
>
>
> When testing cassandra 4.0 on ccm I noticed that everytime I restart a node, truncation snapshots are created for the tables {{system.table_estimates}} and {{system.size_estimates}}:
> {noformat}
> $ ccm create -n 1 test -s
> $ ccm node1 stop
> $ ccm node1 start
> $ ccm node1 stop
> $ ccm node1 start
> $ ccm node1 nodetool listsnapshots
> Snapshot Details:
> Snapshot name Keyspace name Column family name True size Size on disk
> truncated-1628599001857-table_estimates system table_estimates 0 bytes 13 bytes
> truncated-1628599099560-table_estimates system table_estimates 0 bytes 13 bytes
> truncated-1628599001736-size_estimates system size_estimates 0 bytes 13 bytes
> truncated-1628599057438-table_estimates system table_estimates 6.16 KiB 6.19 KiB
> truncated-1628599099458-size_estimates system size_estimates 0 bytes 13 bytes
> truncated-1628599057340-size_estimates system size_estimates 5.73 KiB 5.76 KiB
> Total TrueDiskSpaceUsed: 0 bytes
> {noformat}
> Not sure if this is expected behavior, but feels like a bug to me.
> Reproduced on 4.0, not sure if it reproduces on lower versions.
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