Go Client v7.3.0

[khaf]

This is a major feature release of the Go client and touches some of the fundamental aspects of the inner workings of it.
We suggest complete testing of your application before using it in production.

• New Features

  • CLIENT-2238 Convert batch calls with just one key per node in sub-batches to Get requests.
    If the number keys for a sub-batch to a node is equal or less then the value set in BatchPolicy.DirectGetThreshold, the client use direct get instead of batch commands to reduce the load on the server.

  • CLIENT-2274 Use constant sized connection buffers and resize the connection buffers over time.

    The client would use a single buffer on the connection and would grow it
    per demand in case it needed a bigger buffer, but would not shrink it.
    This helped with avoiding using buffer pools and the associated
    synchronization, but resulted in excessive memory use in case there were a
    few large records in the results, even if they were infrequent.
    This changeset does two things:
    1. Will use a memory pool for large records only. Large records
    are defined as records bigger than aerospike.PoolCutOffBufferSize.
    This is a tiered pool with different buffer sizes. The pool
    uses sync.Pool under the cover, releasing unused buffers back to the
    runtime.
    2. By using bigger aerospike.DefaultBufferSize values, the user can
    imitate the old behavior, so no memory pool is used most of the time.
    3. Setting aerospike.MinBufferSize will prevent the pool using buffer sizes too small,
    having to grow them frequently.
    4. Buffers are resized every 5 seconds to the median size of buffers used over the previous period,
    within the above limits.

    This change should result in much lower memory use by the client.

  • CLIENT-2702 Support Client Transaction Metrics. The native client can now track transaction latencies using histograms. Enable using the Client.EnableMetrics API.

• Improvements

  • [CLIENT-2862] Use default batch policies when the record level batch policy is nil.
  • [CLIENT-2889] Increase grpc MaxRecvMsgSize to handle big records for the proxy client.
  • [CLIENT-2891] Export various batch operation struct fields. Resolves Reading a single value from a map cdt via Operate() #247.
  • Remove dependency on xrand sub-package since the native API is fast enough.
  • Linter Clean up.
  • WritePolicy.SendKey documentation, thanks to Rishabh Sairawat
  • Replaced the deprecated ioutil.ReadFile with os.ReadFile. PR chore: deprecate io/ioutil #430, thanks to Swarit Pandey

• Fixes

  • [CLIENT-2905] Fix inconsistency of handling in-doubt flag in errors.
  • [CLIENT-2890] Support []MapPair return in reflection.
    This fix supports unmarshalling ordered maps into map[K]V and []MapPair in the structs.

[justinlee-aerospike]

changes look good