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https://issues.apache.org/jira/browse/BEAM-4049?focusedWorklogId=90878&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-90878
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ASF GitHub Bot logged work on BEAM-4049:
----------------------------------------
Author: ASF GitHub Bot
Created on: 13/Apr/18 16:40
Start Date: 13/Apr/18 16:40
Worklog Time Spent: 10m
Work Description: adejanovski commented on a change in pull request
#5112: [BEAM-4049] Improve CassandraIO write throughput by performing async
queries
URL: https://github.com/apache/beam/pull/5112#discussion_r181445060
##########
File path:
sdks/java/io/cassandra/src/main/java/org/apache/beam/sdk/io/cassandra/CassandraServiceImpl.java
##########
@@ -350,19 +353,21 @@ public TokenRange(
* Writer storing an entity into Apache Cassandra database.
*/
protected class WriterImpl<T> implements Writer<T> {
-
+ private static final int CONCURRENT_ASYNC_QUERIES = 100;
Review comment:
Not really, because it doesn't relate to the number of nodes or vnodes, it's
more of a best practice to prevent nodes from being overwhelmed. The capacity
of the nodes to handle a lot of concurrent queries will depend partly on the
number of threads in the read thread pool of Cassandra, which is a
configuration element we cannot access from the client.
I'm not sure users should be dealing with this as concurrency can already be
handled by limiting the number of splits/workers.
We can make this configurable but it could be confusing to users and
wouldn't bring improvements in throughput IMHO.
I'd be in favor of leaving this as a constant, but if you want to make it
configurable I'll do it.
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Issue Time Tracking
-------------------
Worklog Id: (was: 90878)
Time Spent: 1h 10m (was: 1h)
> 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: 1h 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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