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https://issues.apache.org/jira/browse/BEAM-4049?focusedWorklogId=91332&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-91332
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ASF GitHub Bot logged work on BEAM-4049:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 16/Apr/18 13:18
            Start Date: 16/Apr/18 13:18
    Worklog Time Spent: 10m 
      Work Description: iemejia commented on issue #5112: [BEAM-4049] Improve 
CassandraIO write throughput by performing async queries
URL: https://github.com/apache/beam/pull/5112#issuecomment-381592757
 
 
   @adejanovski If you are doing the retries feature independently please 
create a new JIRA for it and assign it to yourself. You are now a Contributor 
so you can take JIRAs. Thanks.

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Issue Time Tracking
-------------------

    Worklog Id:     (was: 91332)
    Time Spent: 3h 20m  (was: 3h 10m)

> 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 20m
>  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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