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https://issues.apache.org/jira/browse/FLINK-17691?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17253484#comment-17253484
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Nazar Volynets commented on FLINK-17691:
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*Issue #4*
Why not give a possibility to specify `transaction-id` manually ? What is the
main reason ?
> FlinkKafkaProducer transactional.id too long when using Semantic.EXACTLY_ONCE
> -----------------------------------------------------------------------------
>
> Key: FLINK-17691
> URL: https://issues.apache.org/jira/browse/FLINK-17691
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Kafka
> Affects Versions: 1.10.0, 1.11.0
> Reporter: freezhan
> Assignee: John Mathews
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.12.0
>
> Attachments: image-2020-05-14-20-43-57-414.png,
> image-2020-05-14-20-45-24-030.png, image-2020-05-14-20-45-59-878.png,
> image-2020-05-14-21-09-01-906.png, image-2020-05-14-21-16-43-810.png,
> image-2020-05-14-21-17-09-784.png
>
>
> When sink to Kafka using the {color:#FF0000}Semantic.EXACTLY_ONCE {color}mode.
> The flink Kafka Connector Producer will auto set the
> {color:#FF0000}transactional.id{color}, and the user - defined value are
> ignored.
>
> When the job operator name too long, will send failed
> transactional.id is exceeds the kafka {color:#FF0000}coordinator_key{color}
> limit
> !image-2020-05-14-21-09-01-906.png!
>
> *The flink Kafka Connector policy for automatic generation of transaction.id
> is as follows*
>
> 1. use the {color:#FF0000}taskName + "-" + operatorUniqueID{color} as
> transactional.id prefix (may be too long)
> getRuntimeContext().getTaskName() + "-" + ((StreamingRuntimeContext)
> getRuntimeContext()).getOperatorUniqueID()
> 2. Range of available transactional ids
> [nextFreeTransactionalId, nextFreeTransactionalId + parallelism *
> kafkaProducersPoolSize)
> !image-2020-05-14-20-43-57-414.png!
> !image-2020-05-14-20-45-24-030.png!
> !image-2020-05-14-20-45-59-878.png!
>
> *The Kafka transaction.id check policy as follows:*
>
> {color:#FF0000}string bytes.length can't larger than Short.MAX_VALUE
> (32767){color}
> !image-2020-05-14-21-16-43-810.png!
> !image-2020-05-14-21-17-09-784.png!
>
> *To reproduce this bug, the following conditions must be met:*
>
> # send msg to kafka with exactly once mode
> # the task TaskName' length + TaskName's length is lager than the 32767 (A
> very long line of SQL or window statements can appear)
> *I suggest a solution:*
>
> 1. Allows users to customize transactional.id 's prefix
> or
> 2. Do md5 on the prefix before returning the real transactional.id
>
>
>
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