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ASF GitHub Bot logged work on BEAM-9188: ---------------------------------------- Author: ASF GitHub Bot Created on: 28/Jan/20 15:24 Start Date: 28/Jan/20 15:24 Worklog Time Spent: 10m Work Description: stankiewicz commented on pull request #10701: [BEAM-9188] CassandraIO split performance improvement - cache size of the table URL: https://github.com/apache/beam/pull/10701 Splitting CassandraIO source into multiple sources works fast as it uses one connection pool to Cassandra cluster but after that dataflow.worker.WorkerCustomSources is calling CassandraSource.getEstimatedSizeBytes for each source which setups and tears down connection to Cassandra cluster to calculate same size of table. This optimization introduces caching of size internally just to avoid additional queries. ------------------------ Thank you for your contribution! 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To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org Issue Time Tracking ------------------- Worklog Id: (was: 378322) Time Spent: 20m (was: 10m) > Improving speed of splitting for Custom Sources > ----------------------------------------------- > > Key: BEAM-9188 > URL: https://issues.apache.org/jira/browse/BEAM-9188 > Project: Beam > Issue Type: Improvement > Components: runner-dataflow > Reporter: Radosław Stankiewicz > Assignee: Radosław Stankiewicz > Priority: Minor > Time Spent: 20m > Remaining Estimate: 0h > > At this moment Custom Source in being split and serialized in sequence. If > there are many splits, it takes time to process all splits. > > Example: it takes 2s to calculate size and serialize CassandraSource due to > connection setup and teardown. With 100+ splits, it's a lot of time spent in > 1 worker. -- This message was sent by Atlassian Jira (v8.3.4#803005)