Duo Zhang created HBASE-20742:
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             Summary: Always create WAL directory for region server
                 Key: HBASE-20742
                 URL: https://issues.apache.org/jira/browse/HBASE-20742
             Project: HBase
          Issue Type: Bug
            Reporter: Duo Zhang


After HBASE-20708, when master restart, we will scan the wal directory to find 
out the live servers. In most cases this is OK, as when we create a HRegion 
instance at RS side, we will create a WAL for it, and the directory which 
contains the server name will be there, even if user always use SKIP_WAL.

But there could still be problem as the directory is created in the 
implementation of WAL, not in the initialization of region server, so if user 
uses DisabledWALProvider then we will be in trouble.

So let's fix it.



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