The system HintsColumnFamily seems large in my cluster, and I want to track 
down why that is.  I try invoking "listEndpointsPendingHints()" for 
o.a.c.db.HintedHandoffManager and it never returns, and also freezes the node 
that its invoked against.  It's a 3 node cluster, and all nodes have been up 
and running without issue for a while.  Any help on where to start with this?
               Column Family: HintsColumnFamily
                SSTable count: 11
                Space used (live): 11271669539
                Space used (total): 11271669539
                Number of Keys (estimate): 1408
                Memtable Columns Count: 338
                Memtable Data Size: 0
                Memtable Switch Count: 1
                Read Count: 3
                Read Latency: 4354.669 ms.
                Write Count: 848
                Write Latency: 0.029 ms.
                Pending Tasks: 0
                Bloom Filter False Postives: 0
                Bloom Filter False Ratio: 0.00000
                Bloom Filter Space Used: 12656
                Key cache capacity: 14
                Key cache size: 11
                Key cache hit rate: 0.6666666666666666
                Row cache: disabled
                Compacted row minimum size: 105779
                Compacted row maximum size: 7152383774
                Compacted row mean size: 590818614

Thanks,
Bryce

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