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From "Chris Goffinet (JIRA)" <>
Subject [jira] Commented: (CASSANDRA-1169) AES makes Streaming unhappy
Date Mon, 07 Jun 2010 16:53:48 GMT


Chris Goffinet commented on CASSANDRA-1169:

As mentioned on IRC, we actually saw T sending to S, while anticompaction was running on S
using the exact filename as T. We should probably break streaming out to support `stream/<source>/<sstables>`.

> AES makes Streaming unhappy
> ---------------------------
>                 Key: CASSANDRA-1169
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Stu Hood
>            Priority: Critical
>             Fix For: 0.6.3
> Streaming service assumes there will only be one stream from S to T at a time for any
nodes S and T.  For the original purpose of node movement, this was a reasonable assumption
(any node T can only perform one move at a time) but AES throws off streaming tasks much more
frequently than that given the right conditions, which will de-sync the fragile file ordering
that Streaming assumes (that T knows which files S is going to send, in what order).  Eventually
T is expecting file F1 but S sends a smaller file F2, leading to an infinite loop on T while
it waits for F1 to finish, and T waits for S to acknowledge F2, which it never will.
> For 0.6 maybe the best solution is for AES to manually wait for one of its streaming
tasks to finish, before it allows itself to create another.  For 0.7 it would be nice to make
Streaming more robust.  The whole 4-stage-ack process seems very fragile, and poking around
in parent objects via inetaddress keys makes reasoning about small pieces impossible b/c of
encapsulation violations.

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