What is the redundancy/recovery mechanism of Write-Ahead Log and MemTable. I am specifically asking about this statement and the parts about:
"When a write arrives at a TabletServer it is written to a Write-Ahead Log and then inserted into a sorted data structure in memory called a MemTable. ... If a TabletServer fails, the Master detects it and automatically reassigns the tablets assigned from the failed server to other servers. Any key-value pairs that were in memory at the time the TabletServer are automatically reapplied from the Write-Ahead Log to prevent any loss of data." I.e. what happens if machine holding a MemTable crashes. Will key-value pairs that we in memory have been replicated already? Thank you, Edmon
