Package com.couchbase.client.core.transaction.cleanup

Class LostCleanupDistributed

java.lang.Object

com.couchbase.client.core.transaction.cleanup.LostCleanupDistributed

@Internal
public class LostCleanupDistributed
extends Object

Runs the algorithm to find 'lost' transactions, distributing the work between clients.

The user specifies that lost transactions should be found inside a certain cleanup window of X seconds.

As this algo is distributed and tries to require minimal co-operation between clients (they simply read and write a Client Record doc periodically, there are flaws including:

Two clients can read the same client record at the same time and miss each other's updates A client can read the record just before a new client removes itself

The idea is that these conflicts will sort themselves out on the next iteration, and that in the vast majority of cases each ATR will be checked in X seconds.

Author:

Graham Pople

Constructor Summary

Constructors

Constructor	Description
LostCleanupDistributed(Core core, CoreTransactionsConfig config, Supplier<TransactionsCleaner> cleanerSupplier)

Method Summary

Modifier and Type	Method	Description
void	addToCleanupSet(CollectionIdentifier coll)
Set<CollectionIdentifier>	cleanupSet()
Flux<TransactionCleanupAttemptEvent>	handleATRCleanup(String bp, CollectionIdentifier atrCollection, String atrId, ActiveTransactionRecordStats stats, Duration safetyMargin, SpanWrapper pspan)	Looks at an ATR, finds any expired entries, and cleans them up.
Mono<Void>	shutdown(Duration timeout)

Methods inherited from class java.lang.Object

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

Constructor Detail

LostCleanupDistributed

public LostCleanupDistributed(Core core,
                              CoreTransactionsConfig config,
                              Supplier<TransactionsCleaner> cleanerSupplier)

Method Detail

addToCleanupSet

public void addToCleanupSet(CollectionIdentifier coll)

cleanupSet

public Set<CollectionIdentifier> cleanupSet()

shutdown

public Mono<Void> shutdown(Duration timeout)

handleATRCleanup

public Flux<TransactionCleanupAttemptEvent> handleATRCleanup(String bp,
                                                             CollectionIdentifier atrCollection,
                                                             String atrId,
                                                             ActiveTransactionRecordStats stats,
                                                             Duration safetyMargin,
                                                             SpanWrapper pspan)

Looks at an ATR, finds any expired entries, and cleans them up. Called only from lost.