Examples with ChildMemoryCircuitBreaker org.opensearch.common.breaker.ChildMemoryCircuitBreaker used on opensource projects

Example 1 with ChildMemoryCircuitBreaker

use of org.opensearch.common.breaker.ChildMemoryCircuitBreaker in project OpenSearch by opensearch-project.

the class HierarchyCircuitBreakerServiceTests method testThreadedUpdatesToChildBreakerWithParentLimit.

public void testThreadedUpdatesToChildBreakerWithParentLimit() throws Exception {
    final int NUM_THREADS = scaledRandomIntBetween(3, 15);
    final int BYTES_PER_THREAD = scaledRandomIntBetween(500, 4500);
    final int parentLimit = (BYTES_PER_THREAD * NUM_THREADS) - 2;
    final int childLimit = parentLimit + 10;
    final Thread[] threads = new Thread[NUM_THREADS];
    final AtomicInteger tripped = new AtomicInteger(0);
    final AtomicReference<Throwable> lastException = new AtomicReference<>(null);
    final AtomicInteger parentTripped = new AtomicInteger(0);
    final AtomicReference<ChildMemoryCircuitBreaker> breakerRef = new AtomicReference<>(null);
    final CircuitBreakerService service = new HierarchyCircuitBreakerService(Settings.EMPTY, Collections.emptyList(), new ClusterSettings(Settings.EMPTY, ClusterSettings.BUILT_IN_CLUSTER_SETTINGS)) {

        @Override
        public CircuitBreaker getBreaker(String name) {
            return breakerRef.get();
        }

        @Override
        public void checkParentLimit(long newBytesReserved, String label) throws CircuitBreakingException {
            // Parent will trip right before regular breaker would trip
            long requestBreakerUsed = getBreaker(CircuitBreaker.REQUEST).getUsed();
            if (requestBreakerUsed > parentLimit) {
                parentTripped.incrementAndGet();
                logger.info("--> parent tripped");
                throw new CircuitBreakingException("parent tripped", requestBreakerUsed + newBytesReserved, parentLimit, CircuitBreaker.Durability.PERMANENT);
            }
        }
    };
    final BreakerSettings settings = new BreakerSettings(CircuitBreaker.REQUEST, childLimit, 1.0);
    final ChildMemoryCircuitBreaker breaker = new ChildMemoryCircuitBreaker(settings, logger, (HierarchyCircuitBreakerService) service, CircuitBreaker.REQUEST);
    breakerRef.set(breaker);
    for (int i = 0; i < NUM_THREADS; i++) {
        threads[i] = new Thread(() -> {
            for (int j = 0; j < BYTES_PER_THREAD; j++) {
                try {
                    breaker.addEstimateBytesAndMaybeBreak(1L, "test");
                } catch (CircuitBreakingException e) {
                    tripped.incrementAndGet();
                } catch (Exception e) {
                    lastException.set(e);
                }
            }
        });
    }
    logger.info("--> NUM_THREADS: [{}], BYTES_PER_THREAD: [{}], TOTAL_BYTES: [{}], PARENT_LIMIT: [{}], CHILD_LIMIT: [{}]", NUM_THREADS, BYTES_PER_THREAD, (BYTES_PER_THREAD * NUM_THREADS), parentLimit, childLimit);
    logger.info("--> starting threads...");
    for (Thread t : threads) {
        t.start();
    }
    for (Thread t : threads) {
        t.join();
    }
    logger.info("--> child breaker: used: {}, limit: {}", breaker.getUsed(), breaker.getLimit());
    logger.info("--> parent tripped: {}, total trip count: {} (expecting 1-2 for each)", parentTripped.get(), tripped.get());
    assertThat("no other exceptions were thrown", lastException.get(), equalTo(null));
    assertThat("breaker should be reset back to the parent limit after parent breaker trips", breaker.getUsed(), greaterThanOrEqualTo((long) parentLimit - NUM_THREADS));
    assertThat("parent breaker was tripped at least once", parentTripped.get(), greaterThanOrEqualTo(1));
    assertThat("total breaker was tripped at least once", tripped.get(), greaterThanOrEqualTo(1));
}

Example 2 with ChildMemoryCircuitBreaker

use of org.opensearch.common.breaker.ChildMemoryCircuitBreaker in project OpenSearch by opensearch-project.

the class HierarchyCircuitBreakerServiceTests method testThreadedUpdatesToChildBreaker.

public void testThreadedUpdatesToChildBreaker() throws Exception {
    final int NUM_THREADS = scaledRandomIntBetween(3, 15);
    final int BYTES_PER_THREAD = scaledRandomIntBetween(500, 4500);
    final Thread[] threads = new Thread[NUM_THREADS];
    final AtomicBoolean tripped = new AtomicBoolean(false);
    final AtomicReference<Throwable> lastException = new AtomicReference<>(null);
    final AtomicReference<ChildMemoryCircuitBreaker> breakerRef = new AtomicReference<>(null);
    final CircuitBreakerService service = new HierarchyCircuitBreakerService(Settings.EMPTY, Collections.emptyList(), new ClusterSettings(Settings.EMPTY, ClusterSettings.BUILT_IN_CLUSTER_SETTINGS)) {

        @Override
        public CircuitBreaker getBreaker(String name) {
            return breakerRef.get();
        }

        @Override
        public void checkParentLimit(long newBytesReserved, String label) throws CircuitBreakingException {
        // never trip
        }
    };
    final BreakerSettings settings = new BreakerSettings(CircuitBreaker.REQUEST, (BYTES_PER_THREAD * NUM_THREADS) - 1, 1.0);
    final ChildMemoryCircuitBreaker breaker = new ChildMemoryCircuitBreaker(settings, logger, (HierarchyCircuitBreakerService) service, CircuitBreaker.REQUEST);
    breakerRef.set(breaker);
    for (int i = 0; i < NUM_THREADS; i++) {
        threads[i] = new Thread(() -> {
            for (int j = 0; j < BYTES_PER_THREAD; j++) {
                try {
                    breaker.addEstimateBytesAndMaybeBreak(1L, "test");
                } catch (CircuitBreakingException e) {
                    if (tripped.get()) {
                        assertThat("tripped too many times", true, equalTo(false));
                    } else {
                        assertThat(tripped.compareAndSet(false, true), equalTo(true));
                    }
                } catch (Exception e) {
                    lastException.set(e);
                }
            }
        });
        threads[i].start();
    }
    for (Thread t : threads) {
        t.join();
    }
    assertThat("no other exceptions were thrown", lastException.get(), equalTo(null));
    assertThat("breaker was tripped", tripped.get(), equalTo(true));
    assertThat("breaker was tripped at least once", breaker.getTrippedCount(), greaterThanOrEqualTo(1L));
}