Package org.apache.bookkeeper.client

Class LedgerFragmentReplicator

java.lang.Object

org.apache.bookkeeper.client.LedgerFragmentReplicator

@StatsDoc(name="replication_worker",
          help="Ledger fragment replicator related stats")
public class LedgerFragmentReplicator
extends Object

This is the helper class for replicating the fragments from one bookie to another.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
(package private) static class	LedgerFragmentReplicator.SingleFragmentCallback	Callback for recovery of a single ledger fragment.
(package private) static class	LedgerFragmentReplicator.Throttler

Field Summary

Fields

Modifier and Type	Field	Description
protected LedgerFragmentReplicator.Throttler	replicationThrottle

Constructor Summary

Constructors

Constructor	Description
LedgerFragmentReplicator(BookKeeper bkc, ClientConfiguration conf)
LedgerFragmentReplicator(BookKeeper bkc, StatsLogger statsLogger, ClientConfiguration conf)

Method Summary

Modifier and Type	Method	Description
(package private) void	batchRecoverLedgerFragmentEntry(long startEntryId, long endEntryId, LedgerHandle lh, org.apache.zookeeper.AsyncCallback.VoidCallback ledgerFragmentMcb, Set<BookieId> newBookies, BiConsumer<Long,Long> onReadEntryFailureCallback)
(package private) void	recoverLedgerFragmentEntry(Long entryId, LedgerHandle lh, org.apache.zookeeper.AsyncCallback.VoidCallback ledgerFragmentEntryMcb, Set<BookieId> newBookies, BiConsumer<Long,Long> onReadEntryFailureCallback)	This method asynchronously recovers a specific ledger entry by reading the values via the BookKeeper Client (which would read it from the other replicas) and then writing it to the chosen new bookie.
(package private) void	replicate(LedgerHandle lh, LedgerFragment lf, org.apache.zookeeper.AsyncCallback.VoidCallback ledgerFragmentMcb, Set<BookieId> targetBookieAddresses, BiConsumer<Long,Long> onReadEntryFailureCallback)	This method replicate a ledger fragment which is a contiguous portion of a ledger that was stored in an ensemble that included the failed bookie.
(package private) static Set<LedgerFragment>	splitIntoSubFragments(LedgerHandle lh, LedgerFragment ledgerFragment, long rereplicationEntryBatchSize)	Split the full fragment into batched entry fragments by keeping rereplicationEntryBatchSize of entries in each one and can treat them as sub fragments.

Methods inherited from class java.lang.Object

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

Field Details

replicationThrottle

protected LedgerFragmentReplicator.Throttler replicationThrottle

Constructor Details

LedgerFragmentReplicator

public LedgerFragmentReplicator(BookKeeper bkc,
 StatsLogger statsLogger,
 ClientConfiguration conf)

LedgerFragmentReplicator

public LedgerFragmentReplicator(BookKeeper bkc,
 ClientConfiguration conf)

Method Details

replicate

void replicate(LedgerHandle lh,
 LedgerFragment lf,
 org.apache.zookeeper.AsyncCallback.VoidCallback ledgerFragmentMcb,
 Set<BookieId> targetBookieAddresses,
 BiConsumer<Long,Long> onReadEntryFailureCallback)
        throws InterruptedException

This method replicate a ledger fragment which is a contiguous portion of a ledger that was stored in an ensemble that included the failed bookie. It will Splits the fragment into multiple sub fragments by keeping the max entries up to the configured value of rereplicationEntryBatchSize and then it re-replicates that batched entry fragments one by one. After re-replication of all batched entry fragments, it will update the ensemble info with new Bookie once

Parameters:

lh - LedgerHandle for the ledger

lf - LedgerFragment to replicate

ledgerFragmentMcb - MultiCallback to invoke once we've recovered the current ledger fragment.

targetBookieAddresses - New bookies we want to use to recover and replicate the ledger entries that were stored on the failed bookie.

Throws:

InterruptedException

splitIntoSubFragments

static Set<LedgerFragment> splitIntoSubFragments(LedgerHandle lh,
 LedgerFragment ledgerFragment,
 long rereplicationEntryBatchSize)

Split the full fragment into batched entry fragments by keeping rereplicationEntryBatchSize of entries in each one and can treat them as sub fragments.

recoverLedgerFragmentEntry

void recoverLedgerFragmentEntry(Long entryId,
 LedgerHandle lh,
 org.apache.zookeeper.AsyncCallback.VoidCallback ledgerFragmentEntryMcb,
 Set<BookieId> newBookies,
 BiConsumer<Long,Long> onReadEntryFailureCallback)
                         throws InterruptedException

This method asynchronously recovers a specific ledger entry by reading the values via the BookKeeper Client (which would read it from the other replicas) and then writing it to the chosen new bookie.

Parameters:

entryId - Ledger Entry ID to recover.

lh - LedgerHandle for the ledger

ledgerFragmentEntryMcb - MultiCallback to invoke once we've recovered the current ledger entry.

newBookies - New bookies we want to use to recover and replicate the ledger entries that were stored on the failed bookie.

Throws:

InterruptedException

batchRecoverLedgerFragmentEntry

void batchRecoverLedgerFragmentEntry(long startEntryId,
 long endEntryId,
 LedgerHandle lh,
 org.apache.zookeeper.AsyncCallback.VoidCallback ledgerFragmentMcb,
 Set<BookieId> newBookies,
 BiConsumer<Long,Long> onReadEntryFailureCallback)
                              throws InterruptedException

Throws:

InterruptedException