Ewan Higgs created HDFS-13794:
---------------------------------

             Summary: [PROVIDED Phase 2] Teach BlockAliasMap.Writer `remove` 
method.
                 Key: HDFS-13794
                 URL: https://issues.apache.org/jira/browse/HDFS-13794
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Ewan Higgs
            Assignee: Ewan Higgs


When updating the BlockAliasMap we may need to deal with deleted blocks. 
Otherwise the BlockAliasMap will grow indefinitely(!).

Therefore, the BlockAliasMap.Writer needs a method for removing blocks.



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