steveloughran commented on PR #5953:
URL: https://github.com/apache/hadoop/pull/5953#issuecomment-1902738972
you can use env var resolution within a hadoop core-site file; which lets
you at the values with defaults when unset. on locked down config loading
(oozie etc) then only the default is valid.
```
${env.LOCAL_DIRS:-some.default}/
```
so: no need to add explicit resolution, just document or set as default.
example, s3a uses temp dirs in yarn containers automatically.
```xml
<property>
<name>fs.s3a.buffer.dir</name>
<value>${env.LOCAL_DIRS:-${hadoop.tmp.dir}}/s3a</value>
<description>Comma separated list of directories that will be used to
buffer file
uploads to.
Yarn container path will be used as default value on yarn applications,
otherwise fall back to hadoop.tmp.dir
</description>
</property>
```
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