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  1. Apache Cassandra
  2. CASSANDRA-9673

Improve batchlog write path

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    Description

      Currently we allocate an on-heap ByteBuffer to serialize the batched mutations into, before sending it to a distant node, generating unnecessary garbage (potentially a lot of it).

      With materialized views using the batchlog, it would be nice to optimise the write path:

      • introduce a new verb (Batch)
      • introduce a new message (BatchMessage) that would encapsulate the mutations, expiration, and creation time (similar to HintMessage in CASSANDRA-6230)
      • have MS serialize it directly instead of relying on an intermediate buffer

      To avoid merely shifting the temp buffer to the receiving side(s) we should change the structure of the batchlog table to use a list or a map of individual mutations.

      Attachments

        1. 9673_001.tar.gz
          1.78 MB
          Stefania Alborghetti
        2. 9673_004.tar.gz
          3.83 MB
          Stefania Alborghetti
        3. gc_times_first_node_patched_004.png
          183 kB
          Stefania Alborghetti
        4. gc_times_first_node_trunk_004.png
          180 kB
          Stefania Alborghetti

        Issue Links

          breaks

          Bug - A problem which impairs or prevents the functions of the product. CASSANDRA-12504 BatchlogManager is shut down twice during drain

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          • Resolved
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          Web Link 3.0 patch

          Web Link dtests

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              stefania Stefania Alborghetti
              aleksey Aleksey Yeschenko
              Stefania Alborghetti
              Aleksey Yeschenko
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                Created:
                Updated:
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