Package org.apache.bookkeeper.bookie

Class ScanAndCompareGarbageCollector

java.lang.Object

org.apache.bookkeeper.bookie.ScanAndCompareGarbageCollector

All Implemented Interfaces:

GarbageCollector

public class ScanAndCompareGarbageCollector
extends Object
implements GarbageCollector

Garbage collector implementation using scan and compare.

Garbage collection is processed as below:

• fetch all existing ledgers from zookeeper or metastore according to the LedgerManager, called globalActiveLedgers
• fetch all active ledgers from bookie server, said bkActiveLedgers
• loop over bkActiveLedgers to find those ledgers that are not in globalActiveLedgers, do garbage collection on them.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.bookkeeper.bookie.GarbageCollector

GarbageCollector.GarbageCleaner

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static final org.slf4j.Logger	LOG

Constructor Summary

Constructors

Constructor	Description
ScanAndCompareGarbageCollector(LedgerManager ledgerManager, CompactableLedgerStorage ledgerStorage, ServerConfiguration conf, StatsLogger statsLogger)

Method Summary

Modifier and Type	Method	Description
void	gc(GarbageCollector.GarbageCleaner garbageCleaner)	Do the garbage collector work.
int	getNumActiveLedgers()

Methods inherited from class java.lang.Object

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

Field Details

LOG

static final org.slf4j.Logger LOG

Constructor Details

ScanAndCompareGarbageCollector

public ScanAndCompareGarbageCollector(LedgerManager ledgerManager,
 CompactableLedgerStorage ledgerStorage,
 ServerConfiguration conf,
 StatsLogger statsLogger)
                               throws IOException

Throws:

IOException

Method Details

getNumActiveLedgers

public int getNumActiveLedgers()

gc

public void gc(GarbageCollector.GarbageCleaner garbageCleaner)

Description copied from interface: GarbageCollector

Do the garbage collector work.

Specified by:

gc in interface GarbageCollector

Parameters:

garbageCleaner - cleaner used to clean selected garbages