Steve Loughran created HADOOP-17631:
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Summary: Configuration ${env.VAR:-FALLBACK} eval should
extract/eval FALLBACK restrictSystemProps=true
Key: HADOOP-17631
URL: https://issues.apache.org/jira/browse/HADOOP-17631
Project: Hadoop Common
Issue Type: Bug
Components: common
Affects Versions: 3.3.0
Reporter: Steve Loughran
When configuration reads in resources with a restricted parser, it skips
evaluaging system ${env. } vars. But it also skips evaluating fallbacks
As a result, a property like
${env.LOCAL_DIRS:-${hadoop.tmp.dir}} ends up evaluating as
${env.LOCAL_DIRS:-${hadoop.tmp.dir}}
It should instead fall back to the "env var unset" option of ${hadoop.tmp.dir}.
This allows for configs (like for s3a buffer dirs) which are usable in
restricted mode as well as unrestricted deployments.
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