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https://issues.apache.org/jira/browse/SPARK-23202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16337927#comment-16337927
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Apache Spark commented on SPARK-23202:
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User 'gengliangwang' has created a pull request for this issue:
https://github.com/apache/spark/pull/20386
> Break down DataSourceV2Writer.commit into two phase
> ---------------------------------------------------
>
> Key: SPARK-23202
> URL: https://issues.apache.org/jira/browse/SPARK-23202
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.2.1
> Reporter: Gengliang Wang
> Priority: Major
>
> Currently, the api DataSourceV2Writer#commit(WriterCommitMessage[]) commits a
> writing job with a list of commit messages.
> It makes sense in some scenarios, e.g. MicroBatchExecution.
> However, on receiving commit message, driver can start processing
> messages(e.g. persist messages into files) before all the messages are
> collected.
> The proposal is to Break down DataSourceV2Writer.commit into two phase:
> # add(WriterCommitMessage message): Handles a commit message produced by
> \{@link DataWriter#commit()}.
> # commit(): Commits the writing job.
> This should make the API more flexible, and more reasonable for implementing
> some datasources.
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