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From "Craig Welch (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3318) Create Initial OrderingPolicy Framework and FifoOrderingPolicy
Date Tue, 14 Apr 2015 19:04:24 GMT

    [ https://issues.apache.org/jira/browse/YARN-3318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14494606#comment-14494606

Craig Welch commented on YARN-3318:

bq. Beyond SchedulerApplicationAttempt which is pending YARN-3361, Few comments on latest

I think you misunderstood, the patch doesn't depend on 3361, but after 3361 is in some things
should be removed from this patch.  In any case, I decided that it really belonged in the
integration patch, [YARN-3463], so I've dropped it from here and it will be committed there

bq. 1) CACHED_USED/CACHED_PENDING don't used by anybody, are they pending YARN-3361 as well?

No, that was a miss during the ResourceUsage usage changes!  Something which could affect
functionality!  Amazing, fixed.

bq. 2) AbstractComparatorOrderingPolicy doesn't handle locks, I suggest to add synchronized
lock to all methods if you think it will only be used in single-thread scenario

Since the api returns iterators which must be externally synchronized, OrderingPolicy makes
it clear in documentation that the burden for synchronization rests with the user (the schedulers).
 That's the threading model, so synchronizing here would be pointless

bq. 3) FifoComparator, it will be used by FairOrderingPolicy as well? If so, better to make
it to a separated class

sure, done

bq. 4) How about call getInfo to getStatusMessage, since the "info" is too generic. And add
a comment to indicate it will be used for logger printing.

sure, done

bq. 5) getComparator of AbstractComparatorOrderingPolicy is @VisibleForTest?

sure, done

> Create Initial OrderingPolicy Framework and FifoOrderingPolicy
> --------------------------------------------------------------
>                 Key: YARN-3318
>                 URL: https://issues.apache.org/jira/browse/YARN-3318
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: scheduler
>            Reporter: Craig Welch
>            Assignee: Craig Welch
>         Attachments: YARN-3318.13.patch, YARN-3318.14.patch, YARN-3318.17.patch, YARN-3318.34.patch,
YARN-3318.35.patch, YARN-3318.36.patch, YARN-3318.39.patch, YARN-3318.45.patch, YARN-3318.47.patch,
YARN-3318.48.patch, YARN-3318.52.patch, YARN-3318.53.patch, YARN-3318.56.patch, YARN-3318.57.patch,
YARN-3318.58.patch, YARN-3318.59.patch, YARN-3318.60.patch
> Create the initial framework required for using OrderingPolicies and an initial FifoOrderingPolicy

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