[jira] [Updated] (HADOOP-13699) Configuration does not substitute multiple references to the same var
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https://issues.apache.org/jira/browse/HADOOP-13699?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Andrew Wang updated HADOOP-13699:
-
Release Note: This changes the config var cycle detection introduced in
3.0.0-alpha1 by HADOOP-6871 such that it detects single-variable but not
multi-variable loops. This also fixes resolution of multiple specifications of
the same variable in a config value.
> Configuration does not substitute multiple references to the same var
> -
>
> Key: HADOOP-13699
> URL: https://issues.apache.org/jira/browse/HADOOP-13699
> Project: Hadoop Common
> Issue Type: Bug
> Components: conf
>Affects Versions: 3.0.0-alpha1
>Reporter: Andrew Wang
>Assignee: Andrew Wang
>Priority: Critical
> Attachments: HADOOP-13699.001.patch
>
>
> Config var loop detection was originally introduced by HADOOP-6871. Due to
> cycle detection changes in the trunk patch for HADOOP-11506, resolution for
> multiple references to the same variable no longer resolved, e.g.
> {noformat}
> somekey = "${otherkey} ${otherkey}"
> {noformat}
> This loop detection business is fragile, expensive, and not in branch-2, so
> let's reduce it.
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[jira] [Updated] (HADOOP-13699) Configuration does not substitute multiple references to the same var
[
https://issues.apache.org/jira/browse/HADOOP-13699?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Andrew Wang updated HADOOP-13699:
-
Attachment: HADOOP-13699.001.patch
Patch attached. This only attempts to catch the simple case of a variable
resolving to itself. Support for detecting multiple variable loops is removed.
Solving this generally is like detecting a loop in a linked list. Since this is
performance sensitive code, I think we'd rather not do that.
> Configuration does not substitute multiple references to the same var
> -
>
> Key: HADOOP-13699
> URL: https://issues.apache.org/jira/browse/HADOOP-13699
> Project: Hadoop Common
> Issue Type: Bug
> Components: conf
>Affects Versions: 3.0.0-alpha1
>Reporter: Andrew Wang
>Assignee: Andrew Wang
>Priority: Critical
> Attachments: HADOOP-13699.001.patch
>
>
> Config var loop detection was originally introduced by HADOOP-6871. Due to
> cycle detection changes in the trunk patch for HADOOP-11506, resolution for
> multiple references to the same variable no longer resolved, e.g.
> {noformat}
> somekey = "${otherkey} ${otherkey}"
> {noformat}
> This loop detection business is fragile, expensive, and not in branch-2, so
> let's reduce it.
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