[GitHub] pasha-kuznetsov opened a new pull request #1885: Issue #1884: (@bug W-5697664@) dir_*_usage stats are reported as 0 ...

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pasha-kuznetsov opened a new pull request #1885: Issue #1884: (@bug W-5697664@) dir_*_usage stats are reported as 0 ...
URL: https://github.com/apache/bookkeeper/pull/1885
 
 
   bookies after a restart
   
   ### Motivation
   
   Fixing the Issue #1884:
   
   When a read-only bookie is restarted it keeps reporting `dir_*_usage`
   stats as `0` until it becomes writable again.
   
   This is caused by the `LedgerDirsMonitor.check` only updating
   `diskUsages` if there are any writable dirs, or if the total usage
   goes below the low water mark, otherwise relying on previously filled
   values which are `0` after a bookie is restarted.
   
   ### Changes
   
   * Change the `LedgerDirsMonitor.check` to update `diskUsages`
     even when there are no writable dirs.
   * Add new `testLedgerDirsMonitorStartReadOnly` testing this scenario.
   * Simplify previous tests checking read-only since `diskUsages`
     are now updated regardless if a bookie is in read-only mode.
   
   @jvrao @reddycharan 
   
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