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https://issues.apache.org/jira/browse/SPARK-6048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14339519#comment-14339519
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Marcelo Vanzin commented on SPARK-6048:
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I sort of agree with (1). But I think it's both unlikely (users will probably
use the old option or the new one, but not both), and probably sort of fixable
(but not optimally). Basically, don't override a value that's already set when
using the deprecated key.
I disagree with (2). Just fix remove().
I also disagree with (3), and it's not even the correct interpretation of what
happens. Warning *only* happen when the configuration keys are set, never when
reading. And I think it's actually a good thing that all (or most) of the
warnings show up when creating the conf object, which generally happens early
in the app's life. It means it's easier to see them.
> SparkConf.translateConfKey should translate on get, not set
> -----------------------------------------------------------
>
> Key: SPARK-6048
> URL: https://issues.apache.org/jira/browse/SPARK-6048
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.3.0
> Reporter: Andrew Or
> Assignee: Andrew Or
> Priority: Critical
>
> There are several issues with translating on set.
> (1) The most serious one is that if the user has both the deprecated and the
> latest version of the same config set, then the value picked up by SparkConf
> will be arbitrary. Why? Because during initialization of the conf we call
> `conf.set` on each property in `sys.props` in an order arbitrarily defined by
> Java. As a result, the value of the more recent config may be overridden by
> that of the deprecated one. Instead, we should always use the value of the
> most recent config.
> (2) If we translate on set, then we must keep translating everywhere else. In
> fact, the current code does not translate on remove, which means the
> following won't work if X is deprecated:
> {code}
> conf.set(X, Y)
> conf.remove(X) // X is not in the conf
> {code}
> This requires us to also translate in remove and other places, as we already
> do for contains, leading to more duplicate code.
> (3) Since we call `conf.set` on all configs when initializing the conf, we
> print all deprecation warnings in the beginning. Elsewhere in Spark, however,
> we warn the user when the deprecated config / option / env var is actually
> being used.
> We should keep this consistent so the user won't expect to find all
> deprecation messages in the beginning of his logs.
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