Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/16736
Sorry, I might not explain it clearly. When the the cache size is set to
zero, -1, and 1, what happened to our metadata cache system in each case? Does
it work well? Will we get an error message from `Guava`? If so, should we block
them, instead of relying on the external lib?
I assume the value `1` should work at least. : ) You can make a try to set
the default to 1 and run all the test cases. Hopefully, no test case failed.
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