ASF GitHub Bot logged work on BEAM-4049:

                Author: ASF GitHub Bot
            Created on: 12/Apr/18 07:39
            Start Date: 12/Apr/18 07:39
    Worklog Time Spent: 10m 
      Work Description: adejanovski opened a new pull request #5112: 
[BEAM-4049] Improve CassandraIO write throughput by performing async queries
URL: https://github.com/apache/beam/pull/5112
   The current design uses synchronous queries which serializes all queries and 
is not the recommended way to perform writes in Cassandra.
   This commit makes use of asynchronous queries instead and protects the 
cluster from being overwhelmed by sending no more than 100 queries at the same 
   It was necessary to exclude the ListenableFuture interface from the guava 
relocation that the Datastax Java driver uses, but since it's not included in 
the shaded jar invocation of `saveAsync()` would otherwise fail at runtime. 

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Issue Time Tracking

            Worklog Id:     (was: 90315)
            Time Spent: 10m
    Remaining Estimate: 0h

> 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: Jean-Baptiste Onofré
>            Priority: Major
>              Labels: performance
>          Time Spent: 10m
>  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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