org.apache.hadoop.hbase.master

类 CatalogJanitor

java.lang.Object

org.apache.hadoop.hbase.ScheduledChore

org.apache.hadoop.hbase.master.CatalogJanitor

所有已实现的接口:

Runnable

@InterfaceAudience.Private
public class CatalogJanitor
extends ScheduledChore

A janitor for the catalog tables. Scans the hbase:meta catalog table on a period. Makes a lastReport on state of hbase:meta. Looks for unused regions to garbage collect. Scan of hbase:meta runs if we are NOT in maintenance mode, if we are NOT shutting down, AND if the assignmentmanager is loaded. Playing it safe, we will garbage collect no-longer needed region references only if there are no regions-in-transition (RIT).

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	CatalogJanitor.Report Report made by ReportMakingVisitor

方法概要

限定符和类型	方法和说明
protected void	chore()
boolean	cleanMergeQualifier(RegionInfo region) Checks if the specified region has merge qualifiers, if so, try to clean them.
CatalogJanitor.Report	getLastReport()
protected boolean	initialChore()
static void	main(String[] args) For testing against a cluster.

从类继承的方法 org.apache.hadoop.hbase.ScheduledChore

cancel, cancel, choreForTesting, cleanup, getInitialDelay, getName, getPeriod, getStopper, getTimeUnit, isInitialChoreComplete, isScheduled, run, toString, triggerNow

从类继承的方法 java.lang.Object

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

方法详细资料

initialChore

protected boolean initialChore()

覆盖:

initialChore 在类中 ScheduledChore

chore

protected void chore()

指定者:

chore 在类中 ScheduledChore

getLastReport

public CatalogJanitor.Report getLastReport()

返回:

Returns last published Report that comes of last successful scan of hbase:meta.

cleanMergeQualifier

public boolean cleanMergeQualifier(RegionInfo region)
                            throws IOException

Checks if the specified region has merge qualifiers, if so, try to clean them.

返回:

true if no info:merge* columns; i.e. the specified region doesn't have any merge qualifiers.

抛出:

IOException

main

public static void main(String[] args)
                 throws IOException

For testing against a cluster. Doesn't have a MasterServices context so does not report on good vs bad servers.

抛出:

IOException