sijie opened a new issue #1349: Bookie disk monitor should also monitor journal 
disks
URL: https://github.com/apache/bookkeeper/issues/1349
 
 
   **FEATURE REQUEST**
   
   1. Please describe the feature you are requesting.
   
   currently we monitor ledger and index directories. we should also monitor 
journal directories and turn bookies into readonly when journal disks are full.
   
   2. Indicate the importance of this issue to you (blocker, must-have, 
should-have, nice-to-have). Are you currently using any workarounds to address 
this issue?
   
   *should-have*
   
   3. Provide any additional detail on your proposed use case for this feature.
   
   a simple approach is just adding another ledger dirs manager/monitor to 
monitor journal directories. However this approach might not work well, because 
there will be 2-3 ledger listeners on reacting to different disks. they are 
acting independently so there will be a lot of race conditions on handling 
state transition.
   
   a better approach is to refactor the ledger dirs manager and monitor to have 
one manager and monitor react to state transaction.

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