Kimahriman opened a new pull request, #42301:
URL: https://github.com/apache/spark/pull/42301
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### What changes were proposed in this pull request?
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Adds a new config `spark.sql.streaming.stateStore.rocksdb.forceJavaTmpDir`
that places the local working directory for RocksDB state store underneath
`java.io.tmpdir` instead of going through `Utils.getLocalDir`.
### Why are the changes needed?
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On YARN, the local RocksDB directory is placed in a directory created inside
the root application folder such as
```
/tmp/nm-local-dir/usercache/<user>/appcache/<app_id>/spark-<uuid>/StateStoreId(...)
```
The problem with this is that if an executor crashes for some reason (like
OOM) and the shutdown hooks don't get run, this directory will stay around
forever until the application finishes, which can cause jobs to slowly
accumulate more and more temporary space until finally the node manager goes
unhealthy.
Because this data will only ever be accessed by the executor that created
this directory, it would make sense to store the data inside the container
folder, which will always get cleaned up by the node manager when that yarn
container gets cleaned up. Yarn sets the `java.io.tmpdir` to a path inside this
directory, such as
```
/tmp/nm-local-dir/usercache/<user>/appcache/<app_id>/<container_id>/tmp/
```
### Does this PR introduce _any_ user-facing change?
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Adds a new config to allow users to opt-in to a different location to store
local RocksDB state data.
### How was this patch tested?
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New UT
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