joshelser commented on issue #1029: HBASE-23679 FileSystem objects leak when cleaned up in cleanupBulkLoad URL: https://github.com/apache/hbase/pull/1029#issuecomment-573781272 The problem with #1019 was that other code called beneath SecureBulkLoadManager would expect that there's a cached FileSystem object for it to use. While this is good for us to go through and not willy-nilly expect there to be a cached FS instance hanging around, it does complicate a commit which was intending to simplify things. Thus, I think it's better for us to go the easy-route, fixing SecureBulkLoadManager. I've been testing this by letting two instances of IntegrationTestBulkLoad run concurrently with a small chainLength (to let more bulk loads happen), looking at the output of `jmap histo:live` to see how many `DistributedFileSystem` instances we have strongly referenced (it should never be higher than the 3 FS instances we have open, plus the number of concurrent bulk loads, 2, we could have running). It's been running for about an hour; I'll let it continue until QA comes back, or until my HDFS fills up.
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