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From "Varun Saxena (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (YARN-5170) Eliminate singleton converters and static method access
Date Fri, 10 Jun 2016 15:21:21 GMT

    [ https://issues.apache.org/jira/browse/YARN-5170?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15324618#comment-15324618
] 

Varun Saxena edited comment on YARN-5170 at 6/10/16 3:20 PM:
-------------------------------------------------------------

Should be fine to handle it later.  I am frankly fine either ways because the converter object
is lightweight as it has no members so nothing urgent to fix but then who knows what that
object turns to in future. Will commit it as-is.


was (Author: varun_saxena):
Should be fine to handle it later.  I am frankly fine either ways because the converter object
is lightweight as it has no members so nothing urgent to fix but then who knows what that
object turns to in future.

> Eliminate singleton converters and static method access
> -------------------------------------------------------
>
>                 Key: YARN-5170
>                 URL: https://issues.apache.org/jira/browse/YARN-5170
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>    Affects Versions: YARN-2928
>            Reporter: Joep Rottinghuis
>            Assignee: Joep Rottinghuis
>              Labels: yarn-2928-1st-milestone
>         Attachments: YARN-5170-YARN-2928.01.patch, YARN-5170-YARN-2928.02.patch, YARN-5170-YARN-2928.03.patch,
YARN-5170-YARN-2928.04.patch, YARN-5170-YARN-2928.05.patch, YARN-5170-YARN-2928.06.patch,
YARN-5170-YARN-2928.07.patch, YARN-5170-YARN-2928.08.patch, YARN-5170-YARN-2928.09.patch,
YARN-5170-YARN-2928.10.patch, YARN-5170-YARN-2928.11.patch, YARN-5170-YARN-2928.12.patch,
YARN-5170-YARN-2928.13.patch
>
>
> As part of YARN-5109 we introduced several KeyConverter classes.
> To stay consistent with the existing LongConverter in the sample patch I created I made
these other converter classes singleton as well.
> In conversation with [~sjlee0] who has a general dislike of singletons, we discussed
it is best to get rid of these singletons and make them simply instance variables.
> There are other classes where the keys have static methods referring to a singleton converter.
> Moreover, it turns out that due to code evolution we end up creating the same keys several
times.
> So general approach is to not re-instantiate rowkeys, converters when not needed.
> I would like to create the byte[] rowKey in the RowKey classes their constructor, but
that would leak an incomplete object to the converter.
> There are a few method in TimelineStorageUtils that are used only once, or only by one
class, as part of this refactor I'll move these to keep the "Utils" class as small as possible
and keep them for truly generally used utils that don't really belong anywhere else.



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