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https://issues.apache.org/jira/browse/YARN-5170?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15319481#comment-15319481
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Joep Rottinghuis commented on YARN-5170:
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I'm annotating the *RowKeyConverter classes with @VisibleForTesting. They
should not be directly used by clients. Instead the corresponding *RowKey
should be used to get the rowkey, or the *RowKeyPrefix to get the prefix.
> 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: Varun Saxena
> Attachments: YARN-5170-YARN-2928.01.patch,
> YARN-5170-YARN-2928.02.patch, YARN-5170-YARN-2928.03.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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