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From "Jonathan Ellis (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-3041) Move streams data to too many nodes.
Date Tue, 13 Sep 2011 18:09:11 GMT


Jonathan Ellis updated CASSANDRA-3041:

    Attachment: 3041-v2.txt

v2 uses Sets.difference instead of removeAll

> Move streams data to too many nodes.
> ------------------------------------
>                 Key: CASSANDRA-3041
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.8.4
>            Reporter: Nick Bailey
>             Fix For: 0.8.6
>         Attachments: 0001-Don-t-stream-to-replicas-that-already-have-the-data.patch,
> When you decommission a node, it only streams data to the node that is just now gaining
responsibility for the node's primary range.
> When you move a node it streams data to every node that is responsible for the node's
primary range. This is way more than it needs to, and could be bad in multi-dc setups. We
should absolutely use this bug as a chance/reason to better unify that code, since move should
be doing the same thing decom does.
> This might be worth backporting to 0.8 as well.

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