Cassandra
  1. Cassandra
  2. CASSANDRA-4937

CRAR improvements (object cache + CompressionMetadata chunk offset storage moved off-heap).

    Details

    • Type: Improvement Improvement
    • Status: Resolved
    • Priority: Major Major
    • Resolution: Fixed
    • Fix Version/s: 2.0 beta 1
    • Component/s: None
    • Labels:

      Description

      After good amount of testing on one of the clusters it was found that in order to improve read latency we need to minimize allocation rate that compression involves, that minimizes GC (as well as heap usage) and substantially decreases latency on read heavy workloads.

      I have also discovered that RAR skip cache harms performance in situation when reads are done in parallel with compaction working with relatively big SSTable files (few GB and more). The attached patch removes possibility to skip cache from compressed files (I can also add changes to RAR to remove skip cache functionality as a separate patch).

      1. CASSANDRA-4937-v4.patch
        34 kB
        Pavel Yaskevich
      2. CASSANDRA-4937-trunk.patch
        31 kB
        Pavel Yaskevich
      3. CASSANDRA-4937.patch
        14 kB
        Pavel Yaskevich
      4. 4937-v3.txt
        32 kB
        Jonathan Ellis

        Activity

        No work has yet been logged on this issue.

          People

          • Assignee:
            Pavel Yaskevich
            Reporter:
            Pavel Yaskevich
            Reviewer:
            Yuki Morishita
          • Votes:
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            Watchers:
            3 Start watching this issue

            Dates

            • Created:
              Updated:
              Resolved:

              Development