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From "Jake Mannix (JIRA)" <>
Subject [jira] [Updated] (MAHOUT-319) SVD solvers should be gracefully stoppable/restartable
Date Mon, 11 Apr 2011 18:28:06 GMT


Jake Mannix updated MAHOUT-319:

    Attachment: MAHOUT-319.patch

Patch modifies the LanczosSolver.solve() api in non-backwards-compatible way.  Tests pass.

> SVD solvers should be gracefully stoppable/restartable
> ------------------------------------------------------
>                 Key: MAHOUT-319
>                 URL:
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Math
>    Affects Versions: 0.3
>            Reporter: Jake Mannix
>            Assignee: Jake Mannix
>         Attachments: MAHOUT-319.patch
> LanczosSolver, DistributedLanczosSolver, and HebbianSolver all keep copious amounts of
memory-resident data which is lost if the app crashes or is killed (OOM, forgetting to run
in a screen session, and losing net connectivity to the server running it, etc...).  
> These algorithms (and many other Mahout processes!) should enable a pluggable "persist
state" mechanism (to HDFS, RDBMS, local disk, key-value store, etc), and similarly, a way
to pick up and start from such a state.

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