[Backport] SegmentLoadDropHandler: Fix deadlock when segments have errors loading on startup.#5755
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jihoonson merged 1 commit intoapache:0.12.1from May 9, 2018
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…g on startup. (apache#5735) The "lock" object was used to synchronize start/stop as well as synchronize removals from segmentsToDelete (when a segment is done dropping). This could cause a deadlock if a segment-load throws an exception during loadLocalCache. loadLocalCache is run by start() while it holds the lock, but then it spawns loading threads, and those threads will try to acquire the "segmentsToDelete" lock if they want to drop a corrupt segments. I don't see any reason for these two locks to be the same lock, so I split them.
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Backport of #5735 to 0.12.1.