Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/17295
I removed `StorageUtils.unmap()` in my last commit (see commit message for
details). That makes the confusion go away.
The replication tests fail from time to time but they seem to be flaky
without this patch. See;
https://spark-tests.appspot.com/test-details?suite_name=org.apache.spark.storage.BlockManagerProactiveReplicationSuite&test_name=proactive+block+replication+-+5+replicas+-+4+block+manager+deletions
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