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https://issues.apache.org/jira/browse/FLINK-20972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17264793#comment-17264793
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huajiewang commented on FLINK-20972:
------------------------------------
yes!
> TwoPhaseCommitSinkFunction Output a large amount of EventData
> -------------------------------------------------------------
>
> Key: FLINK-20972
> URL: https://issues.apache.org/jira/browse/FLINK-20972
> Project: Flink
> Issue Type: Improvement
> Components: API / DataStream
> Affects Versions: 1.12.0
> Environment: flink 1.4.0 +
> Reporter: huajiewang
> Priority: Minor
> Labels: easyfix, pull-request-available
> Attachments: Jdbc2PCSinkFunction.scala
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> when TwoPhaseCommitSinkFunctionOutput tigger notifyCheckpointComplete,
> Maybe A large number of EventData will be output (log.info)
> ,which will cause IO bottleneck and disk waste
>
> my code in the attachment, A large number event data output in the log
> output by flink,
>
> like:
> Jdbc2PCSinkFunction 1/1 - checkpoint 4 complete, committing transaction
> TransactionHolde \{handle=Transaction(b420c880a951403984f231dd7e33597b,
> ListBuffer(insert into table(field1,field2) value ('11','22') ... ... ),
> transactionStartTime=1610426158532} from checkpoint 4
>
> method notifyCheckpointComplete of TwoPhaseCommitSinkFunction, about
> LOG.info code is as follows:
> LOG.info("{} - checkpoint {} complete, committing transaction {} from
> checkpoint {}",
> name(), checkpointId, pendingTransaction, pendingTransactionCheckpointId);
>
> will be call the toString method of pendingTransaction (TransactionHolder),
> TransactionHolder'toString method code is:
> @Override
> public String toString() {
> return "TransactionHolder
> {" + "handle=" + handle + ", transactionStartTime=" + transactionStartTime +
> '}
> ';
> }
>
> handle is the concrete realization of my Transaction! There is a parameter
> of List type in my Transaction, which is used to receive data. as a result,
> these data are printed out(log.info)
>
>
>
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