Duo Zhang commented on HBASE-20167:

Changed the several fields to be private.

> Optimize the implementation of ReplicationSourceWALReader
> ---------------------------------------------------------
>                 Key: HBASE-20167
>                 URL: https://issues.apache.org/jira/browse/HBASE-20167
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Replication
>            Reporter: Duo Zhang
>            Assignee: Duo Zhang
>            Priority: Major
>             Fix For: 3.0.0
>         Attachments: HBASE-20167-v1.patch, HBASE-20167-v2.patch, 
> HBASE-20167.patch
> After HBASE-20148, serial replication will be an option for peer. Since an 
> instance of ReplicationSourceWALReader can only belongs to one peer, we do 
> not need to add the so many 'if' in the implementation of readWALEntries to 
> check whether we should consider serial replication. We can just make a sub 
> class or something similiar for serial replication to make the code clean.

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