ASF GitHub Bot logged work on BEAM-4049:

                Author: ASF GitHub Bot
            Created on: 16/Apr/18 15:16
            Start Date: 16/Apr/18 15:16
    Worklog Time Spent: 10m 
      Work Description: echauchot commented on issue #5112: [BEAM-4049] Improve 
CassandraIO write throughput by performing async queries
URL: https://github.com/apache/beam/pull/5112#issuecomment-381622622
   > I'm not sure why the tests are failing in Jenkins now since I just changed 
the comment style on CONCURRENT_ASYNC_QUERIES.
   Maybe it's unrelated to my push ?
   I don't know if it is the case here, but please know for the future that 
sometimes the jenkins build hits the misconfigured beam5 machine; so errors 
might be unrelated to the code sometimes

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Issue Time Tracking

    Worklog Id:     (was: 91362)
    Time Spent: 3h 50m  (was: 3h 40m)

> Improve write throughput of CassandraIO
> ---------------------------------------
>                 Key: BEAM-4049
>                 URL: https://issues.apache.org/jira/browse/BEAM-4049
>             Project: Beam
>          Issue Type: Improvement
>          Components: io-java-cassandra
>    Affects Versions: 2.4.0
>            Reporter: Alexander Dejanovski
>            Assignee: Alexander Dejanovski
>            Priority: Major
>              Labels: performance
>          Time Spent: 3h 50m
>  Remaining Estimate: 0h
> The CassandraIO currently uses the mapper to perform writes in a synchronous 
> fashion. 
> This implies that writes are serialized and is a very suboptimal way of 
> writing to Cassandra.
> The IO should use the saveAsync() method instead of save() and should wait 
> for completion each time 100 queries are in flight, in order to avoid 
> overwhelming clusters.

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