Github user jongwook commented on the issue:
https://github.com/apache/spark/pull/16916
@vanzin [`statCache` stores the result of
`getFileStatus`](https://github.com/jongwook/spark/blob/523c58c35fc9f046c601e99a0389d7ca7c3e508f/resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/ClientDistributedCacheManager.scala#L173-L185)
or [`globStatus` calls to
HDFS](https://github.com/jongwook/spark/blob/523c58c35fc9f046c601e99a0389d7ca7c3e508f/resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala#L505-L507),
which do not resolve symlinks, so unless we give up symlink resolution, I
don't think that merging them is sufficient.
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