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https://issues.apache.org/jira/browse/IGNITE-6507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16182226#comment-16182226
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Alexei Scherbakov commented on IGNITE-6507:
-------------------------------------------
[~sboikov],
The test demonstrates a problem on commit phase: commit is successful on
primary node and not successful on backup nodes in network split scenario
(simulated in test by stopping backup nodes in wrongtime).
In network split scenario usually single DC is selected for transaction
processing, and if wrong DC is selected the commit is lost (as shown in test)
I can try to implement network split emulation in test by somehow hacking
TcpDiscoverySpi. Could you suggest a proper way ?
> Commit can be lost in network split scenario
> --------------------------------------------
>
> Key: IGNITE-6507
> URL: https://issues.apache.org/jira/browse/IGNITE-6507
> Project: Ignite
> Issue Type: Bug
> Components: general
> Affects Versions: 2.1
> Reporter: Alexei Scherbakov
> Priority: Critical
> Fix For: 2.3
>
>
> Commit can be lost in network split scenario
> {noformat}
> /*
> * Licensed to the Apache Software Foundation (ASF) under one or more
> * contributor license agreements. See the NOTICE file distributed with
> * this work for additional information regarding copyright ownership.
> * The ASF licenses this file to You under the Apache License, Version 2.0
> * (the "License"); you may not use this file except in compliance with
> * the License. You may obtain a copy of the License at
> *
> * http://www.apache.org/licenses/LICENSE-2.0
> *
> * Unless required by applicable law or agreed to in writing, software
> * distributed under the License is distributed on an "AS IS" BASIS,
> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
> * See the License for the specific language governing permissions and
> * limitations under the License.
> */
> package org.apache.ignite.internal.processors.cache.distributed.dht;
> import org.apache.ignite.IgniteCache;
> import org.apache.ignite.cache.affinity.Affinity;
> import org.apache.ignite.cache.affinity.rendezvous.RendezvousAffinityFunction;
> import org.apache.ignite.configuration.BinaryConfiguration;
> import org.apache.ignite.configuration.CacheConfiguration;
> import org.apache.ignite.configuration.IgniteConfiguration;
> import org.apache.ignite.configuration.MemoryConfiguration;
> import org.apache.ignite.internal.IgniteEx;
> import org.apache.ignite.internal.IgniteInternalFuture;
> import org.apache.ignite.internal.TestRecordingCommunicationSpi;
> import org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi;
> import org.apache.ignite.spi.discovery.tcp.ipfinder.TcpDiscoveryIpFinder;
> import org.apache.ignite.spi.discovery.tcp.ipfinder.vm.TcpDiscoveryVmIpFinder;
> import org.apache.ignite.testframework.GridTestUtils;
> import org.apache.ignite.testframework.junits.common.GridCommonAbstractTest;
> import static org.apache.ignite.cache.CacheAtomicityMode.TRANSACTIONAL;
> import static org.apache.ignite.cache.CacheWriteSynchronizationMode.FULL_SYNC;
> /**
> * Tests commit consitency in split-brain scenario.
> */
> public class GridCacheGridSplitTxConsistencyTest extends
> GridCommonAbstractTest {
> /** */
> private static final TcpDiscoveryIpFinder IP_FINDER = new
> TcpDiscoveryVmIpFinder(true);
> /**
> * {@inheritDoc}
> */
> @Override protected void afterTest() throws Exception {
> super.afterTest();
> stopAllGrids();
> GridTestUtils.deleteDbFiles();
> }
> /**
> * {@inheritDoc}
> */
> @Override protected IgniteConfiguration getConfiguration(String gridName)
> throws Exception {
> IgniteConfiguration cfg = super.getConfiguration(gridName);
> cfg.setCommunicationSpi(new TestRecordingCommunicationSpi());
> cfg.setConsistentId(gridName);
> MemoryConfiguration memCfg = new MemoryConfiguration();
> memCfg.setPageSize(1024);
> memCfg.setDefaultMemoryPolicySize(100 * 1024 * 1024);
> cfg.setMemoryConfiguration(memCfg);
> ((TcpDiscoverySpi) cfg.getDiscoverySpi()).setIpFinder(IP_FINDER);
> CacheConfiguration ccfg = new CacheConfiguration();
> ccfg.setName(DEFAULT_CACHE_NAME);
> ccfg.setAtomicityMode(TRANSACTIONAL);
> ccfg.setWriteSynchronizationMode(FULL_SYNC);
> ccfg.setAffinity(new RendezvousAffinityFunction(false, 3));
> ccfg.setBackups(2);
> cfg.setCacheConfiguration(ccfg);
> return cfg;
> }
> /**
> * Tests if commits are working as expected.
> * @throws Exception
> */
> public void testSplitTxConsistency() throws Exception {
> IgniteEx grid0 = startGrid(0);
> grid0.active(true);
> IgniteEx grid1 = startGrid(1);
> IgniteEx grid2 = startGrid(2);
> int key = 0;
> Affinity<Object> aff = grid0.affinity(DEFAULT_CACHE_NAME);
> assertTrue(aff.isPrimary(grid0.localNode(), key));
> assertTrue(aff.isBackup(grid1.localNode(), key));
> assertTrue(aff.isBackup(grid2.localNode(), key));
> final TestRecordingCommunicationSpi spi0 =
> (TestRecordingCommunicationSpi) grid0.configuration().getCommunicationSpi();
> spi0.blockMessages(GridDhtTxFinishRequest.class, grid1.name());
> spi0.blockMessages(GridDhtTxFinishRequest.class, grid2.name());
> IgniteInternalFuture<?> fut = multithreadedAsync(new Runnable() {
> @Override public void run() {
> try {
> spi0.waitForBlocked();
> } catch (InterruptedException e) {
> fail();
> }
> stopGrid(1);
> stopGrid(2);
> spi0.stopBlock(true);
> }
> }, 1, "stop-thread");
> IgniteCache cache = grid0.cache(DEFAULT_CACHE_NAME);
> int val0 = 1;
> cache.put(key, val0);
> fut.get();
> assertTrue("Expecting committed key", cache.containsKey(0));
> // Some actions can be done after successful commit at this point.
> // Now split-brain happens.
> // In real life grid0 and grid1 are separated and do not see each
> other.
> // Pretend second DC is active.
> stopGrid(0);
> grid1 = startGrid(1);
> grid1.active(true);
> grid2 = startGrid(2);
> // Test if previous commit is not lost.
> assertTrue("Expecting committed key",
> grid1.cache(DEFAULT_CACHE_NAME).containsKey(0));
> assertTrue("Expecting committed key",
> grid2.cache(DEFAULT_CACHE_NAME).containsKey(0));
> }
> }
> {noformat}
> If routing will be switched to second data center, new transactions will no
> see commited state.
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