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Posted to commits@cassandra.apache.org by "Jeremy Hanna (Jira)" <ji...@apache.org> on 2020/01/02 05:19:00 UTC

[jira] [Comment Edited] (CASSANDRA-13019) Improve clearsnapshot to delete the snapshot files slowly

    [ https://issues.apache.org/jira/browse/CASSANDRA-13019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17006592#comment-17006592 ] 

Jeremy Hanna edited comment on CASSANDRA-13019 at 1/2/20 5:18 AM:
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I like the idea to reduce the effect on the regular server operations when performing the snapshot, especially if there is a coordinated snapshot across the cluster.

Because it may affect time it takes for operations that call {{snapshot}} indirectly, should we make a note of this in the NEWS.txt - both the availability of the throttle and that it may affect time to run things like {{truncate}} and {{drop}}?


was (Author: jeromatron):
I like the idea to reduce the effect on the regular server operations when performing the snapshot, especially if there is a coordinated snapshot across the cluster.

Because it may affect time it takes for operations that call `snapshot` indirectly, should we make a note of this in the NEWS.txt - both the availability of the throttle and that it may affect time to run things like `truncate` and `drop`?

> Improve clearsnapshot to delete the snapshot files slowly 
> ----------------------------------------------------------
>
>                 Key: CASSANDRA-13019
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13019
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Legacy/Core
>            Reporter: Dikang Gu
>            Assignee: Jeff Jirsa
>            Priority: Normal
>              Labels: pull-request-available
>             Fix For: 4.x
>
>          Time Spent: 2h 10m
>  Remaining Estimate: 0h
>
> In our environment, we are creating snapshots for backup, after we finish the backup, we are running {{clearsnapshot}} to delete the snapshot files. At that time we may have thousands of files to delete, and it's causing sudden disk usage spike. As a result, we are experiencing a spike of drop messages from Cassandra.
> I think we should implement something like {{slowrm}} to delete the snapshot files slowly, avoid the sudden disk usage spike.



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