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Posted to pr@cassandra.apache.org by burmanm <gi...@git.apache.org> on 2018/04/05 14:09:20 UTC

[GitHub] cassandra pull request #217: CASSANDRA-14281

GitHub user burmanm opened a pull request:

    https://github.com/apache/cassandra/pull/217

    CASSANDRA-14281

    Remove locking from DEHR and use CAS update operation in rescaling to improve performance
    
    Add method to combine two Snapshots
    
    Use LongAdder[] instead of AtomicLongArray to reduce contention
    
    Read metrics from children LatencyMetrics instances when needed, instead of writing to parent instances each time.
    
    Add benchmark for LatencyMetrics and Reservoir
    
    When child is released, it replicates previous status to parents

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/burmanm/cassandra latency_metrics

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/cassandra/pull/217.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #217
    
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commit 98ad2320e6c28bcfd7afc6a7f2bf25b640bc957a
Author: Michael Burman <ya...@...>
Date:   2018-03-01T12:59:53Z

    Remove locking from DEHR and use CAS update operation in rescaling to improve performance
    
    Add method to combine two Snapshots
    
    Use LongAdder[] instead of AtomicLongArray to reduce contention
    
    Read metrics from children LatencyMetrics instances when needed, instead of writing to parent instances each time.
    
    Add benchmark for LatencyMetrics and Reservoir
    
    When child is released, it replicates previous status to parents

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