[GitHub] [accumulo] dlmarion commented on pull request #3139: re #1169: Added a property to preserve locations on tserver shutdown

[GitBox <gi...@apache.org>]

dlmarion commented on PR #3139:
URL: https://github.com/apache/accumulo/pull/3139#issuecomment-1361994685

   IIRC:
   
    1. The `last` column is where the tablet was located when a file was written last
    2. The `loc` column is its current location
    3. The `future` column is the where it will be located
    4. `loc` is set and `future` is cleared when a tablet is hosted, and `loc` is cleared and `future` is set when the tablet is not hosted. 
    
    I haven't run this down yet, but I'm wondering if:
    
    1. My description of the columns is correct
    2. If `loc` remains set on a normal shutdown.
    
    If both of these are `yes`, then it should be the case on system startup that we can take the set of servers that are alive (after waiting MASTER_STARTUP_TSERVER_AVAIL_MIN_COUNT or MASTER_STARTUP_TSERVER_AVAIL_MAX_WAIT) and immediately re-assign the tablets to those servers before the normal assign/balance process takes place.


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