MATLAB DISTRIBUTED COMPUTING SERVER 4 - SYSTEM ADMINISTRATORS GUIDE Manuel d'utilisateur télécharger pdf (Page 30)

2 Network Administration

Locating Checkp

oint Directories

Checkpoint dire

ctories contain information related to persistence data, which

the engine servi

ces use to create continuity from one instance of a session to

another. For exa

mple, if you stop and restart a job manager, the new session

will continue t

he old session, using all the same data.

A primary featu

re offered by the checkpoint directories is in crash recovery.

This allows eng

ine services to automatically resume their sessions after a

system goes dow

n and comes back up, minimizing the loss of data. However, if

aMATLABworke

r goes down d uring the evaluation of a task, that task is

neither reeva

luated nor reassigned to another w orker. In this case, a finished

job may not h a

ve a complete set of output data, as data from any unfinished

tasks might b

e m issing.

Note If a job m

anager crashes and restarts, its workers can take up to 2

minutes to re

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MATLAB DISTRIBUTED COMPUTING SERVER 4 - SYSTEM ADMINISTRATORS GUIDE Manuel d'utilisateur Page 30