Ewan Higgs created HDFS-12093:
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Summary: [READ] Share remoteFS between ProvidedReplica instances.
Key: HDFS-12093
URL: https://issues.apache.org/jira/browse/HDFS-12093
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Ewan Higgs
Then a Datanode comes online using Provided storage, it fills the
{{ReplicaMap}} with the known replicas. With Provided Storage, this includes
{{ProvidedReplica}} instances. Each of these objects, in their constructor,
will construct an FileSystem using the Service Provider. This can result in
contacting the remote file system and checking that the credentials are correct
and that the data is there. For large systems this is a prohibitively expensive
operation to perform per replica.
Instead, the {{ProvidedVolumeImpl}} should own the reference to the
{{remoteFS}} and should share it with the {{ProvidedReplica}} objects on their
creation.
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