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https://issues.apache.org/jira/browse/CASSANDRA-20149?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stefan Miklosovic updated CASSANDRA-20149:
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Description:
listsnapshots calls jmx on two occasions
1) when getting trueSnapshotsSize
2) when getting snapshot details
What it was doing in practice before CASSANDRA-18111 was that it was
essentially loading the snapshots twice hence almost double the time to list.
What it is doing after CASSANDRA-18111 is that it still resolves sizes but in a
way more efficient way however it still calls jmx twice which is not necessary.
The fix consists of returning resolved sizes together with snapshot details and
then on the client size we just display and sum it up in case of wanting to
know the total.
It is more optimal to just return results in one response and sum few numbers
on the client from the results than to call jmx twice.
was:
listsnapshots calls jmx on two occasions
1) when getting trueSnapshotsSize
2) when getting snapshot details
What it was doing in practice before CASSANDRA-18111 was that it was
essentially loading the snapshots twice hence almost double the time to list.
What it is doing after CASSANDRA-18111 is that it still resolves sizes but in a
way more efficient way however it still calls jmx twice which is not necessary.
The fix consists of returning resolved sizes together with snapshot details and
then on the client size we just display and sum it up in case of wanting to
know the total.
It is way more faster to just return results in one response and sum few
numbers on the client from the results than to call jmx twice.
> nodetool listsnapshots initiates two jmx calls unnecessarily
> ------------------------------------------------------------
>
> Key: CASSANDRA-20149
> URL: https://issues.apache.org/jira/browse/CASSANDRA-20149
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Local/Snapshots
> Reporter: Stefan Miklosovic
> Assignee: Stefan Miklosovic
> Priority: Normal
> Fix For: 5.x
>
>
> listsnapshots calls jmx on two occasions
> 1) when getting trueSnapshotsSize
> 2) when getting snapshot details
> What it was doing in practice before CASSANDRA-18111 was that it was
> essentially loading the snapshots twice hence almost double the time to list.
> What it is doing after CASSANDRA-18111 is that it still resolves sizes but in
> a way more efficient way however it still calls jmx twice which is not
> necessary.
> The fix consists of returning resolved sizes together with snapshot details
> and then on the client size we just display and sum it up in case of wanting
> to know the total.
> It is more optimal to just return results in one response and sum few numbers
> on the client from the results than to call jmx twice.
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