Fenghua Hu created HDFS-10804:
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Summary: 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
Reporter: Fenghua Hu
Assignee: Fenghua Hu
Priority: Minor
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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