rdhabalia opened a new pull request #2591: Fix: Compaction with last deleted 
keys not completing compaction
URL: https://github.com/apache/incubator-pulsar/pull/2591
   ### Motivation
   Right now, topic-compaction ignores the message-id with empty payload but if 
the last message in the ledger has empty payload then compactor doesn't 
complete the compaction because compactor ignores last message and doesn't 
complete the result-future so, caller never sees complete result.
   ### Modifications
   - Compactor calculates` from` and `to` position for compacted ledger 
according to last non-deleted active key.
   - Compactor handles tail deleted keys from the ledger and completes 
compaction process gracefully.
   ### Result
   compactor can successfully compact ledger whose last message is also deleted.

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