Package org.apache.hadoop.hdfs.server.datanode.fsdataset.impl

Class ReplicaCachingGetSpaceUsed

java.lang.Object

org.apache.hadoop.fs.CachingGetSpaceUsed

org.apache.hadoop.hdfs.server.datanode.FSCachingGetSpaceUsed

org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.ReplicaCachingGetSpaceUsed

All Implemented Interfaces:

Closeable, AutoCloseable, org.apache.hadoop.fs.GetSpaceUsed

@Private
@Evolving
public class ReplicaCachingGetSpaceUsed
extends FSCachingGetSpaceUsed

Fast and accurate class to tell how much space HDFS is using. This class gets hdfs used space from FsDatasetImpl#volumeMap#ReplicaInfos that uses an in memory way. Getting hdfs used space by ReplicaCachingGetSpaceUsed impl only includes block and meta files, but DU impl is blockpool dir based statistics that will include additional files, e.g. tmp dir, scanner.cursor file. Getting space used by DU impl will be greater than by ReplicaCachingGetSpaceUsed impl, but the latter is more accurate. Setting fs.getspaceused.classname to org.apache.hadoop.hdfs.server.datanode.fsdataset impl.ReplicaCachingGetSpaceUsed in your core-site.xml if we want to enable.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.hdfs.server.datanode.FSCachingGetSpaceUsed

FSCachingGetSpaceUsed.Builder

Field Summary

Fields inherited from class org.apache.hadoop.fs.CachingGetSpaceUsed

used

Constructor Summary

Constructors

Constructor	Description
ReplicaCachingGetSpaceUsed(FSCachingGetSpaceUsed.Builder builder)

Method Summary

Modifier and Type	Method	Description
protected void	refresh()

Methods inherited from class org.apache.hadoop.fs.CachingGetSpaceUsed

close, getDirPath, getJitter, getRefreshInterval, getUsed, incDfsUsed, setShouldFirstRefresh, setUsed

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ReplicaCachingGetSpaceUsed

public ReplicaCachingGetSpaceUsed(FSCachingGetSpaceUsed.Builder builder)
                           throws IOException

Throws:

IOException

Method Details

refresh

protected void refresh()

Specified by:

refresh in class org.apache.hadoop.fs.CachingGetSpaceUsed