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https://issues.apache.org/jira/browse/HDFS-12093?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Virajith Jalaparti updated HDFS-12093:
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Hadoop Flags: Reviewed
> [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
> Assignee: Virajith Jalaparti
> Fix For: 3.1.0
>
> Attachments: HDFS-12093-HDFS-9806.001.patch,
> HDFS-12093-HDFS-9806.002.patch
>
>
> When 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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