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  1. Apache Cassandra
  2. CASSANDRA-13338

JMX: EstimatedPartitionCount is expensive

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Details

    • Improvement
    • Status: Open
    • Normal
    • Resolution: Unresolved
    • None
    • Legacy/Observability
    • Low Hanging Fruit

    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

      Attachments

        1. Throughput_vs_Threads_Combined _true_snapshot_size.png
          100 kB
          Stefan Miklosovic
        2. Throughput_vs_Threads_Combined_snapshot_listing.png
          102 kB
          Stefan Miklosovic
        3. Percentiles_vs_Threads_Combined_true_snapshot_size.png
          146 kB
          Stefan Miklosovic
        4. Percentiles_vs_Threads_Combined_snapshot_listing.png
          162 kB
          Stefan Miklosovic
        5. Average_Time_vs_Threads_Combined_true_snapshot_size.png
          101 kB
          Stefan Miklosovic
        6. Average_Time_vs_Threads_Combined_snapshot_listing.png
          112 kB
          Stefan Miklosovic

        Issue Links

          is related to

          Bug - A problem which impairs or prevents the functions of the product. CASSANDRA-16843 List snapshots of dropped tables

          • Normal -
          • Resolved
          relates to

          Bug - A problem which impairs or prevents the functions of the product. CASSANDRA-17588 "Total TrueDiskSpaceUsed" computation does not include manifest and schema files

          • Normal -
          • Resolved

          Improvement - An improvement or enhancement to an existing feature or task. CASSANDRA-18102 Add a virtual table to list snapshots

          • Normal -
          • Resolved

          Improvement - An improvement or enhancement to an existing feature or task. CASSANDRA-18111 Centralize all snapshot operations to SnapshotManager and cache snapshots

          • Normal -
          • Resolved

          Activity

            People

              smiklosovic Stefan Miklosovic
              iksaif Corentin Chary
              Stefan Miklosovic
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              Dates

                Created:
                Updated: