chooseVolume
public V chooseVolume(List<V> volumes,
long blockSize,
String storageId)
throws IOException
Description copied from interface: org.apache.hadoop.hdfs.server.datanode.fsdataset.VolumeChoosingPolicy
Choose a volume to place a replica,
given a list of volumes and the replica size sought for storage.
The caller should synchronize access to the list of volumes.
- Specified by:
chooseVolume
in interface org.apache.hadoop.hdfs.server.datanode.fsdataset.VolumeChoosingPolicy<V extends FsVolumeSpi>
- Parameters:
volumes
- - a list of available volumes.
blockSize
- - the size of the replica for which a volume is sought.
storageId
- - the storage id of the Volume nominated by the namenode.
This can usually be ignored by the VolumeChoosingPolicy.
- Returns:
- the chosen volume.
- Throws:
IOException
- when disks are unavailable or are full.