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Posted to commits@cassandra.apache.org by "Benjamin Lerer (Jira)" <ji...@apache.org> on 2020/06/19 08:38:00 UTC
[jira] [Updated] (CASSANDRA-15665) StreamManager should clearly
differentiate between "initiator" and "receiver" sessions
[ https://issues.apache.org/jira/browse/CASSANDRA-15665?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Benjamin Lerer updated CASSANDRA-15665:
---------------------------------------
Status: Ready to Commit (was: Review In Progress)
> 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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