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https://issues.apache.org/jira/browse/HDFS-10804?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Fenghua Hu updated HDFS-10804:
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Fix Version/s: 3.0.0-beta1
Release Note: Add a private object for synchronization as default.
This should be able to improve performance.
Affects Version/s: 3.0.0-beta1
Status: Patch Available (was: Open)
> Use finer-granularity lock for ReplicaMap
> -----------------------------------------
>
> Key: HDFS-10804
> URL: https://issues.apache.org/jira/browse/HDFS-10804
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Affects Versions: 3.0.0-beta1
> Reporter: Fenghua Hu
> Assignee: Fenghua Hu
> Priority: Minor
> Fix For: 3.0.0-beta1
>
>
> In currently implementation, ReplicaMap takes an external object as lock for
> synchronization.
> In function FsDatasetImpl#FsDatasetImpl(), the object is for synchronization
> is "this", i.e. FsDatasetImpl:
> volumeMap = new ReplicaMap(this);
> and in private FsDatasetImpl#addVolume(), "this" object is used for
> synchronization as well.
> ReplicaMap tempVolumeMap = new ReplicaMap(this);
> I am not sure if we really need so big object FsDatasetImpl for ReplicaMap's
> synchronization. If it's not necessary, this could reduce lock contention on
> FsDatasetImpl object and improve performance.
> Could you please give me some suggestions? Thanks a lot!
> Fenghua
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