Package com.couchbase.transactions.cleanup

Class LostCleanupDistributed

java.lang.Object

com.couchbase.transactions.cleanup.LostCleanupDistributed

@Internal
public class LostCleanupDistributed
extends java.lang.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.

Constructor Summary

Constructors

Constructor	Description
LostCleanupDistributed(MergedTransactionConfig config, ClusterData clusterData, java.util.function.Supplier<Cleaner> cleanerSupplier)
LostCleanupDistributed(TransactionConfig config, ClusterData clusterData, java.util.function.Supplier<Cleaner> cleanerSupplier)

Method Summary

Modifier and Type	Method	Description
static java.util.List<java.lang.String>	atrsToHandle(int indexOfThisClient, int numActiveClients, int numAtrs)
java.lang.String	clientUuid()
reactor.core.publisher.Flux<TransactionCleanupAttempt>	handleATRCleanup(java.lang.String bp, com.couchbase.client.java.ReactiveCollection atrCollection, java.lang.String atrId, ATRStats stats, java.time.Duration safetyMargin)
reactor.core.publisher.Flux<TransactionCleanupAttempt>	handleATRCleanup(java.lang.String bp, com.couchbase.client.java.ReactiveCollection atrCollection, java.lang.String atrId, ATRStats stats, java.time.Duration safetyMargin, SpanWrapper pspan)	Looks at an ATR, finds any expired entries, and cleans them up.
void	stop()
void	stopThreads()

Methods inherited from class java.lang.Object

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

Constructor Detail

LostCleanupDistributed

public LostCleanupDistributed(TransactionConfig config,
                              ClusterData clusterData,
                              java.util.function.Supplier<Cleaner> cleanerSupplier)

LostCleanupDistributed

public LostCleanupDistributed(MergedTransactionConfig config,
                              ClusterData clusterData,
                              java.util.function.Supplier<Cleaner> cleanerSupplier)

Method Detail

clientUuid

public java.lang.String clientUuid()

stop

public void stop()

stopThreads

public void stopThreads()

atrsToHandle

public static java.util.List<java.lang.String> atrsToHandle(int indexOfThisClient,
                                                            int numActiveClients,
                                                            int numAtrs)

handleATRCleanup

public reactor.core.publisher.Flux<TransactionCleanupAttempt> handleATRCleanup(java.lang.String bp,
                                                                               com.couchbase.client.java.ReactiveCollection atrCollection,
                                                                               java.lang.String atrId,
                                                                               ATRStats stats,
                                                                               java.time.Duration safetyMargin)

handleATRCleanup

public reactor.core.publisher.Flux<TransactionCleanupAttempt> handleATRCleanup(java.lang.String bp,
                                                                               com.couchbase.client.java.ReactiveCollection atrCollection,
                                                                               java.lang.String atrId,
                                                                               ATRStats stats,
                                                                               java.time.Duration safetyMargin,
                                                                               SpanWrapper pspan)

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