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https://issues.apache.org/jira/browse/BEAM-6324?focusedWorklogId=190023&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-190023
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ASF GitHub Bot logged work on BEAM-6324:
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Author: ASF GitHub Bot
Created on: 25/Jan/19 14:34
Start Date: 25/Jan/19 14:34
Worklog Time Spent: 10m
Work Description: srfrnk commented on issue #7340: [BEAM-6324] -
Cassandra reader with query implemented
URL: https://github.com/apache/beam/pull/7340#issuecomment-457591407
@timrobertson100 Thanks. Will make the required fixes + take a look at
adding a test. Hopefully next week.
@echauchot Thanks. I am aware that Cassandra hold many constraints over what
you can and cannot do in a query (and specifically in the Where clause) -
however when using a String Where clause I don't think any such tests can be
done very safely. I suppose any incorrect Where cluase would come back as an
error and shown to the user. I will need to test that though to confirm.
In general this is just a workaround to be able to use Cassandra with a
reasonable amount of performance. The real solution has to use the
QueryBuilder. Alas since Clause (and other classes by Datastax) is not
Serializable this is impossible to do. I have tried to [PR for a change to
allow this but it was
rejected](https://github.com/datastax/java-driver/pull/1163). Currently I'm
using [my own forked repo of the datastax java-driver
](https://github.com/srfrnk/java-driver) which has the compiled JAR pushed so I
can use it from other projects directly. Until such version is introduces I
don't think better code can be done in here. WDYT?
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Issue Time Tracking
-------------------
Worklog Id: (was: 190023)
Time Spent: 1h 40m (was: 1.5h)
> CassandraIO.Read - Add the ability to provide a filter to the query
> -------------------------------------------------------------------
>
> Key: BEAM-6324
> URL: https://issues.apache.org/jira/browse/BEAM-6324
> Project: Beam
> Issue Type: Improvement
> Components: io-java-cassandra
> Affects Versions: 2.9.0
> Reporter: Shahar Frank
> Assignee: Shahar Frank
> Priority: Major
> Labels: performance, pull-request-available
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> CassandraIO.Read doesn't support using WHERE to filter the input at the
> source (In Cassandra) which might provide great performance boost.
> Already implemented by:
> https://github.com/apache/beam/pull/7340
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