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https://issues.apache.org/jira/browse/HADOOP-8532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13505245#comment-13505245
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Aaron T. Myers commented on HADOOP-8532:
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Raising it to a higher value is fine by me.
> [Configuration] Increase or make variable substitution depth configurable
> -------------------------------------------------------------------------
>
> Key: HADOOP-8532
> URL: https://issues.apache.org/jira/browse/HADOOP-8532
> Project: Hadoop Common
> Issue Type: Improvement
> Components: conf
> Affects Versions: 2.0.0-alpha
> Reporter: Harsh J
>
> We've had some users recently complain that the default MAX_SUBST hardcode of
> 20 isn't sufficient for their substitution needs and they wished it were
> configurable rather than having to roll about with workarounds such as using
> temporary smaller substitutes and then building the fuller one after it. We
> should consider raising the default hardcode, or provide a way to make it
> configurable instead.
> Related: HIVE-2021 changed something similar for their HiveConf classes.
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