Examples with LocalPaxosServices com.palantir.atlasdb.factory.Leaders.LocalPaxosServices used on opensource projects

Example 1 with LocalPaxosServices

use of com.palantir.atlasdb.factory.Leaders.LocalPaxosServices in project atlasdb by palantir.

the class TransactionManagers method createRawLeaderServices.

private static LockAndTimestampServices createRawLeaderServices(LeaderConfig leaderConfig, Consumer<Object> env, com.google.common.base.Supplier<LockService> lock, com.google.common.base.Supplier<TimestampService> time, String userAgent) {
    // Create local services, that may or may not end up being registered in an Consumer<Object>.
    LeaderRuntimeConfig defaultRuntime = ImmutableLeaderRuntimeConfig.builder().build();
    LocalPaxosServices localPaxosServices = Leaders.createAndRegisterLocalServices(env, leaderConfig, () -> defaultRuntime, userAgent);
    LeaderElectionService leader = localPaxosServices.leaderElectionService();
    LockService localLock = ServiceCreator.createInstrumentedService(AwaitingLeadershipProxy.newProxyInstance(LockService.class, lock, leader), LockService.class);
    TimestampService localTime = ServiceCreator.createInstrumentedService(AwaitingLeadershipProxy.newProxyInstance(TimestampService.class, time, leader), TimestampService.class);
    env.accept(localLock);
    env.accept(localTime);
    // Create remote services, that may end up calling our own local services.
    ImmutableServerListConfig serverListConfig = ImmutableServerListConfig.builder().servers(leaderConfig.leaders()).sslConfiguration(leaderConfig.sslConfiguration()).build();
    LockService remoteLock = new ServiceCreator<>(LockService.class, userAgent).apply(serverListConfig);
    TimestampService remoteTime = new ServiceCreator<>(TimestampService.class, userAgent).apply(serverListConfig);
    if (leaderConfig.leaders().size() == 1) {
        // Attempting to connect to ourself while processing a request can lead to deadlock if incoming request
        // volume is high, as all Jetty threads end up waiting for the timestamp server, and no threads remain to
        // actually handle the timestamp server requests. If we are the only single leader, we can avoid the
        // deadlock entirely; so use PingableLeader's getUUID() to detect this situation and eliminate the redundant
        // call.
        PingableLeader localPingableLeader = localPaxosServices.pingableLeader();
        String localServerId = localPingableLeader.getUUID();
        PingableLeader remotePingableLeader = AtlasDbFeignTargetFactory.createRsProxy(ServiceCreator.createSslSocketFactory(leaderConfig.sslConfiguration()), Iterables.getOnlyElement(leaderConfig.leaders()), PingableLeader.class, userAgent);
        // Determine asynchronously whether the remote services are talking to our local services.
        CompletableFuture<Boolean> useLocalServicesFuture = new CompletableFuture<>();
        runAsync.accept(() -> {
            int logAfter = LOGGING_INTERVAL;
            while (true) {
                try {
                    String remoteServerId = remotePingableLeader.getUUID();
                    useLocalServicesFuture.complete(localServerId.equals(remoteServerId));
                    return;
                } catch (ClientErrorException e) {
                    useLocalServicesFuture.complete(false);
                    return;
                } catch (Throwable e) {
                    if (--logAfter == 0) {
                        log.warn("Failed to read remote timestamp server ID", e);
                        logAfter = LOGGING_INTERVAL;
                    }
                }
                Uninterruptibles.sleepUninterruptibly(1, TimeUnit.SECONDS);
            }
        });
        // Create dynamic service proxies, that switch to talking directly to our local services if it turns out our
        // remote services are pointed at them anyway.
        LockService dynamicLockService = LocalOrRemoteProxy.newProxyInstance(LockService.class, localLock, remoteLock, useLocalServicesFuture);
        TimestampService dynamicTimeService = LocalOrRemoteProxy.newProxyInstance(TimestampService.class, localTime, remoteTime, useLocalServicesFuture);
        return ImmutableLockAndTimestampServices.builder().lock(dynamicLockService).timestamp(dynamicTimeService).timelock(new LegacyTimelockService(dynamicTimeService, dynamicLockService, LOCK_CLIENT)).build();
    } else {
        return ImmutableLockAndTimestampServices.builder().lock(remoteLock).timestamp(remoteTime).timelock(new LegacyTimelockService(remoteTime, remoteLock, LOCK_CLIENT)).build();
    }
}