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https://issues.apache.org/jira/browse/CASSANDRA-13019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16971223#comment-16971223
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Jeff Jirsa commented on CASSANDRA-13019:
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All good suggestions. Here's how the nodetool command is setup:
{code}
(oss-ccm) jjirsa:cassandra jjirsa$ ccm node1 nodetool | grep -i snapshot
clearsnapshot Remove the snapshot with the given name from
the given keyspaces. If no snapshotName is specified we will remove all
snapshots
getsnapshotthrottle Print the hardlink-per-second throttle for
snapshot/clearsnapshot
listsnapshots Lists all the snapshots along with the size on
disk and true size.
setsnapshotthrottle Set the hardlinks-per-second cap for snapshot
and clearsnapshot throttling
snapshot Take a snapshot of specified keyspaces or a
snapshot of the specified table
(oss-ccm) jjirsa:cassandra jjirsa$ ccm node1 nodetool getsnapshotthrottle
Snapshot throttle is disabled
(oss-ccm) jjirsa:cassandra jjirsa$ time ccm node1 nodetool snapshot
Requested creating snapshot(s) for [all keyspaces] with snapshot name
[1573418615757] and options {skipFlush=false}
Snapshot directory: 1573418615757
real 0m1.593s
user 0m1.791s
sys 0m0.308s
(oss-ccm) jjirsa:cassandra jjirsa$ ccm node1 nodetool setsnapshotthrottle 2
(oss-ccm) jjirsa:cassandra jjirsa$ ccm node1 nodetool getsnapshotthrottle
Current snapshot throttle: 2 links/s
(oss-ccm) jjirsa:cassandra jjirsa$ time ccm node1 nodetool snapshot
Requested creating snapshot(s) for [all keyspaces] with snapshot name
[1573418645021] and options {skipFlush=false}
Snapshot directory: 1573418645021
real 1m53.393s
user 0m1.750s
sys 0m0.371s
{code}
> 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: 0.5h
> 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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