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https://issues.apache.org/jira/browse/FLINK-16495?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jark Wu updated FLINK-16495:
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Priority: Critical (was: Major)
> Improve default flush strategy for Elasticsearch sink to make it work
> out-of-box
> --------------------------------------------------------------------------------
>
> Key: FLINK-16495
> URL: https://issues.apache.org/jira/browse/FLINK-16495
> Project: Flink
> Issue Type: Improvement
> Components: Connectors / ElasticSearch, Table SQL / Ecosystem
> Reporter: Jark Wu
> Priority: Critical
> Labels: usability
> Fix For: 1.11.0
>
>
> Currently, Elasticsearch sink provides 3 flush options:
> {code:java}
> 'connector.bulk-flush.max-actions' = '42'
> 'connector.bulk-flush.max-size' = '42 mb'
> 'connector.bulk-flush.interval' = '60000'
> {code}
> All of them are optional and have no default value in Flink side [1]. But
> flush actions and flush size have a default value {{1000}} and {{5mb}} in
> Elasticsearch client [2]. This results in some surprising behavior that no
> results are outputed by default, see user report [3]. Because it has to wait
> for 1000 records however there is no so many records in the testing.
> This will also be a potential "problem" in production. Because if it's a low
> throughout job, soem data may take a very long time to be visible in the
> elasticsearch.
> In this issue, I propose to have Flink's default values for these 3 options.
> {code:java}
> 'connector.bulk-flush.max-actions' = '1000' -- same to the ES client
> default value
> 'connector.bulk-flush.max-size' = '5mb' -- same to the ES client default
> value
> 'connector.bulk-flush.interval' = '5s' -- avoid no output result
> {code}
> [1]:
> https://github.com/apache/flink/blob/master/flink-connectors/flink-connector-elasticsearch-base/src/main/java/org/apache/flink/streaming/connectors/elasticsearch/ElasticsearchSinkBase.java#L357-L356
> [2]:
> https://www.elastic.co/guide/en/elasticsearch/client/java-api/current/java-docs-bulk-processor.html
> [3]:
> http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Should-I-use-a-Sink-or-Connector-Or-Both-td33352.html
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