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https://issues.apache.org/jira/browse/FLINK-18044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17217115#comment-17217115
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Steven Zhen Wu commented on FLINK-18044:
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I agree with Stephan that code should avoid explicit assumptions about the
parallelism and subtask index.
But I also see the value of exposing subtask index for non-essential purpose.
e.g.
* right now, Kafka source adds a random number as `client.id` suffix. A subtask
index is the more appropriate alternative.
* logging with subtask index can help with troubleshooting.
> Add the subtask index information to the SourceReaderContext.
> -------------------------------------------------------------
>
> Key: FLINK-18044
> URL: https://issues.apache.org/jira/browse/FLINK-18044
> Project: Flink
> Issue Type: Sub-task
> Components: Connectors / Common
> Reporter: Jiangjie Qin
> Priority: Major
> Labels: pull-request-available
>
> It is useful for the `SourceReader` to retrieve its subtask id. For example,
> Kafka readers can create a consumer with proper client id.
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