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https://issues.apache.org/jira/browse/CASSANDRA-15665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17092214#comment-17092214
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ZhaoYang commented on CASSANDRA-15665:
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CI looks good, dtest failures are not related.
> StreamManager should clearly differentiate between "initiator" and "receiver"
> sessions
> --------------------------------------------------------------------------------------
>
> Key: CASSANDRA-15665
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15665
> Project: Cassandra
> Issue Type: Bug
> Components: Legacy/Streaming and Messaging
> Reporter: Sergio Bossa
> Assignee: ZhaoYang
> Priority: Normal
> Fix For: 4.0
>
>
> {{StreamManager}} does currently a suboptimal job in differentiating between
> stream sessions (in form of {{StreamResultFuture}}) which have been either
> initiated or "received", for the following reasons:
> 1) Naming is IMO confusing: a "receiver" session could actually both send and
> receive files, so technically an initiator is also a receiver.
> 2) {{StreamManager#findSession()}} assumes we should first looking into
> "initiator" sessions, then into "receiver" ones: this is a dangerous
> assumptions, in particular for test environments where the same process could
> work as both an initiator and a receiver.
> I would recommend the following changes:
> 1) Rename "receiver" with "follower" everywhere the former is used.
> 2) Introduce a new flag into {{StreamMessageHeader}} to signal if the message
> comes from an initiator or follower session, in order to correctly
> differentiate and look for sessions in {{StreamManager}}.
> While my arguments above might seem trivial, I believe they will improve
> clarity and save from potential bugs/headaches at testing time, and doing
> such changes now that we're revamping streaming for 4.0 seems the right time.
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