[GitHub] sijie opened a new pull request #1315: (WIP) Issue 1314: Provide a mechanism to allow high priority writes to readonly bookies

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sijie opened a new pull request #1315: (WIP) Issue 1314: Provide a mechanism to allow high priority writes to readonly bookies
URL: https://github.com/apache/bookkeeper/pull/1315
 
 
   Descriptions of the changes in this PR:
   
   *Problem*
   
   Currently we allow fence requests going through readonly bookies, since fence requests are special read requests. However a ledger can only be sealed after it is successfully recovered. If bookies are in readonly, those recovery writes won't go through.
   
   If there is a bookie outage happened (e.g. all bookies are readonly), all ledgers are not able to be sealed. It might be good to have a similar setting like minUsableSizeForIndexFileCreation for recovery writes.
   
   This can improve operability during outage.
   
   *Solution*
   
   - add a setting `minUsableSizeForHighPriorityWrites` to allow accepting high priority writes on readonly bookies.
   
   Master Issue: #1314 
   
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