keith-turner commented on issue #1998:
URL: https://github.com/apache/accumulo/issues/1998#issuecomment-818040783
> Can you give a brief summary of what happens when an external compaction
completes?
1. The compactor makes an RPC call the compaction coordinator to let it know
the compactions completed
2. The coordinator writes an entry to the ~ecomp section of the metadata
table recording the compaction completed AND queues up an async RPC to the
tablet to let it know the tablet completed.
3. The coordinator periodically scans the ~ecomp section of the metadata
table looking for tablets to notify
4. When the tablet recieves the message that an external compaction
completed, it does some sanity checks and if everything looks ok it will :
1. Update tablets in memory list of files
2. Update tablet metadata (deleting the tablets information about the
external compaction and updating the files atomically in a single mutation)
3. Delete ~ecomp entry from metadata table
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