Ewan Higgs created HDFS-13698:
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Summary: [PROVIDED Phase 2] Provided ReplicaMap should be LRU with
separate lookup from normal Replicas
Key: HDFS-13698
URL: https://issues.apache.org/jira/browse/HDFS-13698
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Ewan Higgs
Assignee: Virajith Jalaparti
The existing ReplicaMap uses {{ExtendedBlock}} to lookup the replica
information. However, Provided replicas should not be in the ReplicaMap;
instead they should be lookups in the AliasMap. In order to handle this case,
the ReplicaMap lookups should be split into two phases:
Lookup by normal ReplicaMap (as is done now) and lookup in AliasMap to see if
there is also a Provided replica. The performance of this second provided
lookup should be sped up using an LRU cache.
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