Package org.apache.hadoop.hdfs.server.namenode

Class ContentSummaryComputationContext

java.lang.Object

org.apache.hadoop.hdfs.server.namenode.ContentSummaryComputationContext

@Private
@Unstable
public class ContentSummaryComputationContext
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
static final org.slf4j.Logger	LOG
static final String	REPLICATED

Constructor Summary

Constructors

Constructor	Description
ContentSummaryComputationContext(BlockStoragePolicySuite bsps)	Constructor for blocking computation.
ContentSummaryComputationContext(FSDirectory dir, FSNamesystem fsn, long limitPerRun, long sleepMicroSec)	Constructor
ContentSummaryComputationContext(FSDirectory dir, FSNamesystem fsn, long limitPerRun, long sleepMicroSec, FSPermissionChecker pc)

Method Summary

Modifier and Type	Method	Description
BlockStoragePolicySuite	getBlockStoragePolicySuite()
ContentCounts	getCounts()	Get the content counts
String	getErasureCodingPolicyName(INode inode)	Get the erasure coding policy.
ContentCounts	getSnapshotCounts()
long	getYieldCount()	Return current yield count
boolean	yield()	Relinquish locks held during computation for a short while and reacquire them.

Methods inherited from class java.lang.Object

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

Field Details

REPLICATED

public static final String REPLICATED

See Also:

• Constant Field Values

LOG

public static final org.slf4j.Logger LOG

Constructor Details

ContentSummaryComputationContext

public ContentSummaryComputationContext(FSDirectory dir,
 FSNamesystem fsn,
 long limitPerRun,
 long sleepMicroSec)

Constructor

Parameters:

dir - The FSDirectory instance

fsn - The FSNamesystem instance

limitPerRun - allowed number of operations in one locking period. 0 or a negative number means no limit (i.e. no yielding)

ContentSummaryComputationContext

public ContentSummaryComputationContext(FSDirectory dir,
 FSNamesystem fsn,
 long limitPerRun,
 long sleepMicroSec,
 FSPermissionChecker pc)

ContentSummaryComputationContext

public ContentSummaryComputationContext(BlockStoragePolicySuite bsps)

Constructor for blocking computation.

Method Details

getYieldCount

public long getYieldCount()

Return current yield count

yield

public boolean yield()

Relinquish locks held during computation for a short while and reacquire them. This will give other threads a chance to acquire the contended locks and run.

Returns:

true if locks were released and reacquired.

getCounts

public ContentCounts getCounts()

Get the content counts

getSnapshotCounts

public ContentCounts getSnapshotCounts()

getBlockStoragePolicySuite

public BlockStoragePolicySuite getBlockStoragePolicySuite()

getErasureCodingPolicyName

public String getErasureCodingPolicyName(INode inode)

Get the erasure coding policy.