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https://issues.apache.org/jira/browse/CASSANDRA-13338?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stefan Miklosovic updated CASSANDRA-13338:
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Description:
EstimatedPartitionCount / EstimatedRowCount / -SnapshotSize seem particularly
expensive. For example on our system
org.apache.cassandra.metrics:type=ColumnFamily,name=SnapshotsSize can take as
much as half a second.- (This was resolved by CASSANDRA-18111).
All this accumulated means that export stats for all your tables (with
metrics-graphite or jmx_exporter) is going to take quite some time.
We should certainly try to find the most expensive end points and see if there
is a way to cache some of the values.
cc: [~rgerard]
EDIT
was:
EstimatedPartitionCount / EstimatedRowCount / SnapshotSize seem particularly
expensive. For example on our system
org.apache.cassandra.metrics:type=ColumnFamily,name=SnapshotsSize can take as
much as half a second.
All this cumulated means that export stats for all your tables (with
metrics-graphite or jmx_exporter) is going to take quite some time.
We should certainly try to find the most expensive end points and see if there
is a way to cache some of the values.
cc: [~rgerard]
> JMX: EstimatedPartitionCount is expensive
> -----------------------------------------
>
> Key: CASSANDRA-13338
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13338
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Legacy/Observability
> Reporter: Corentin Chary
> Assignee: Stefan Miklosovic
> Priority: Normal
> Labels: lhf
> Attachments: Average_Time_vs_Threads_Combined_snapshot_listing.png,
> Average_Time_vs_Threads_Combined_true_snapshot_size.png,
> Percentiles_vs_Threads_Combined_snapshot_listing.png,
> Percentiles_vs_Threads_Combined_true_snapshot_size.png,
> Throughput_vs_Threads_Combined _true_snapshot_size.png,
> Throughput_vs_Threads_Combined_snapshot_listing.png
>
>
> EstimatedPartitionCount / EstimatedRowCount / -SnapshotSize seem particularly
> expensive. For example on our system
> org.apache.cassandra.metrics:type=ColumnFamily,name=SnapshotsSize can take as
> much as half a second.- (This was resolved by CASSANDRA-18111).
> All this accumulated means that export stats for all your tables (with
> metrics-graphite or jmx_exporter) is going to take quite some time.
> We should certainly try to find the most expensive end points and see if
> there is a way to cache some of the values.
> cc: [~rgerard]
> EDIT
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