Hi all,
I am reading HDFS source code and got one question about FsDatasetImpl. In
FsDatasetImpl#FsDatasetImpl(), we use the statement to create global ReplicaMap
object,
volumeMap = new ReplicaMap(this);
“this” is passed as input and is assigned to volumeMap.mutex for
synchronization.
In private FsDatasetImpl#addVolume(), "this" object is used for synchronization
as well.
ReplicaMap tempVolumeMap = new ReplicaMap(this);
but in public addVolume(), “fsVolume” is passed as input.
final ReplicaMap tempVolumeMap = new ReplicaMap(fsVolume);
I am wondering if we can replace “this” with a smaller object, just like
fsVolume in the third case, so that we can improve performance. Any comments?
Regards,
Fenghua
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