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From "Jonathan Ellis (JIRA)" <>
Subject [jira] Commented: (CASSANDRA-385) intellibootstrap
Date Thu, 24 Sep 2009 22:20:15 GMT


Jonathan Ellis commented on CASSANDRA-385:

    get token on bootstrap that gives us half of the keys from the most heavily-loaded node.
    the "splits" list should also be useful for #342.

    add getLoadMap jmx method; add load info to nodeprobe ring

    use Strings instead of Endpoints in jmx methods. merge cluster info into ring.

    move javadoc into mbean.  inline methods where wrapping is not necessary to satisfy Demeter

    make LoadInfo a double instead of going from long -> string -> LoadInfo -> int

    clean up loadinfo and SLB

> intellibootstrap
> ----------------
>                 Key: CASSANDRA-385
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>             Fix For: 0.5
>         Attachments: 0001-CASSANDRA-385-clean-up-loadinfo-and-SLB.txt, 0002-make-LoadInfo-a-double-instead-of-going-from-long-s.txt,
0003-move-javadoc-into-mbean.-inline-methods-where-wrappin.txt, 0004-use-Strings-instead-of-Endpoints-in-jmx-methods.-merge.txt,
0005-add-getLoadMap-jmx-method-add-load-info-to-nodeprobe.txt, 0006-get-token-on-bootstrap-that-gives-us-half-of-the-keys.txt
> ideally bootstrap mode should determine its new position on the ring by examining the
Load of the existing nodes in the cluster.  (currently Load is just disk space used but making
this pluggable is another ticket.)  having found the highest-load-node-that-is-not-participating-in-bootstrap,
it should ask that node for a Token which would move half the keys over to the new node.
> This is easily computed since we have a periodic sampling of keys in memory of all the
keys on disk, and even SSTable.getIndexedKeys that merges all such keys.  So pick the midpoint,
and turn it into a token (these are decorated keys so that is always possible).

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