Felix N created HDFS-17532:
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             Summary: Allow router state store cache update to overwrite and 
delete in parallel
                 Key: HDFS-17532
                 URL: https://issues.apache.org/jira/browse/HDFS-17532
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs, rbf
            Reporter: Felix N
            Assignee: Felix N


Current implementation for router state store update is quite inefficient, so 
much that when routers are removed and a lot of NameNodeMembership records are 
deleted in a short burst, the deletions triggered a router safemode in our 
cluster and caused a lot of troubles.

This ticket aims to allow the overwrite part and delete part of 
org.apache.hadoop.hdfs.server.federation.store.CachedRecordStore#overrideExpiredRecords
 to run in parallel.

See HDFS-17529 for the other half of this improvement.



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