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From "Semen Boikov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-6181) Tx is not rolled back on timeout leading to potential whole grid hang
Date Wed, 06 Sep 2017 11:20:00 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-6181?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16155203#comment-16155203
] 

Semen Boikov commented on IGNITE-6181:
--------------------------------------

[~ascherbakov]],

Thanks for fixes, after one more review I have more comments:
1.
{noformat}
                /** Timed out local transactions are cleared in {@link #onLocalClose}. */
                if (!tx.timedOut() || !tx.pessimistic())
                    threadMap.remove(tx.threadId(), tx);
{noformat}

Why optimistic/pessimistic txs are handled in different way? 

Actually I do not like these changes related to threadMap. I think more clear fix is completely
get rid of threadMap, and replace it with ThreadLocal (anyway as I can see we always access
threadMap using current thread's id).This ThreadLocal should be set after tx is created and
cleared in close(). Please try implement this.
					
2. 100ms timeout can not fix race. Please provide more details what race are you talking about?
Let' find correct way to fix it
3. TimeoutObject is not removed when 'tx.rollback' is called (I changed your test to reproduce
it, take a look), please fix.
4. Please add tests for all tx isolation/concurrency types.
5. It seems we do not need this TimeoutObject for implicit transactions (i.e. just cache.put
without explicit txStart call) ? Please add this check.
6. About changes in IgniteTransactionsImpl.txStart0: as I understand it is possible to get
tx there only if tx.close() was not called? This is incorrect API usage and I think exception
is ok in this cases, so changes in IgniteTransactionsImpl.txStart0 are not needed.

Thanks!


> Tx is not rolled back on timeout leading to potential whole grid hang
> ---------------------------------------------------------------------
>
>                 Key: IGNITE-6181
>                 URL: https://issues.apache.org/jira/browse/IGNITE-6181
>             Project: Ignite
>          Issue Type: Improvement
>    Affects Versions: 2.1
>            Reporter: Alexei Scherbakov
>            Assignee: Alexei Scherbakov
>             Fix For: 2.3
>
>
> Unit test reproducer:
> {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.cache;
> import java.util.concurrent.CountDownLatch;
> import java.util.concurrent.TimeUnit;
> import java.util.concurrent.atomic.AtomicBoolean;
> import org.apache.ignite.Ignite;
> import org.apache.ignite.IgniteException;
> import org.apache.ignite.configuration.CacheConfiguration;
> import org.apache.ignite.configuration.IgniteConfiguration;
> import org.apache.ignite.configuration.TransactionConfiguration;
> import org.apache.ignite.internal.IgniteInternalFuture;
> import org.apache.ignite.internal.util.typedef.internal.U;
> import org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi;
> import org.apache.ignite.spi.discovery.tcp.ipfinder.vm.TcpDiscoveryVmIpFinder;
> import org.apache.ignite.testframework.junits.common.GridCommonAbstractTest;
> import org.apache.ignite.transactions.Transaction;
> import org.apache.ignite.transactions.TransactionConcurrency;
> import org.apache.ignite.transactions.TransactionIsolation;
> /**
>  * Tests ability to rollback not properly closed transaction.
>  */
> public class IgniteTxTimeoutTest extends GridCommonAbstractTest {
>     /** */
>     private static final long TX_TIMEOUT = 3_000L;
>     /** */
>     private static final String CACHE_NAME = "test";
>     /** IP finder. */
>     private static final TcpDiscoveryVmIpFinder IP_FINDER = new TcpDiscoveryVmIpFinder(true);
>     /** */
>     private final CountDownLatch l = new CountDownLatch(1);
>     /** */
>     private final Object mux = new Object();
>     /** {@inheritDoc} */
>     @Override protected IgniteConfiguration getConfiguration(String igniteInstanceName)
throws Exception {
>         IgniteConfiguration cfg = super.getConfiguration(igniteInstanceName);
>         cfg.setDiscoverySpi(new TcpDiscoverySpi().setIpFinder(IP_FINDER));
>         TransactionConfiguration txCfg = new TransactionConfiguration();
>         txCfg.setDefaultTxTimeout(TX_TIMEOUT);
>         cfg.setTransactionConfiguration(txCfg);
>         CacheConfiguration ccfg = new CacheConfiguration(CACHE_NAME);
>         ccfg.setAtomicityMode(CacheAtomicityMode.TRANSACTIONAL);
>         cfg.setCacheConfiguration(ccfg);
>         return cfg;
>     }
>     /** */
>     public void testTxTimeoutHandling() throws Exception {
>         try {
>             final Ignite ignite = startGrid(0);
>             final AtomicBoolean released = new AtomicBoolean();
>             multithreadedAsync(new Runnable() {
>                 @Override public void run() {
>                     // Start tx with default settings.
>                     try (Transaction tx = ignite.transactions().txStart()) {
>                         ignite.cache(CACHE_NAME).put(1, 1);
>                         l.countDown();
>                         // Wait longer than default timeout.
>                         synchronized (mux) {
>                             while (!released.get()) {
>                                 try {
>                                     mux.wait();
>                                 }
>                                 catch (InterruptedException e) {
>                                     throw new IgniteException(e);
>                                 }
>                             }
>                         }
>                         try {
>                             tx.commit();
>                             fail();
>                         }
>                         catch (IgniteException e) {
>                             // Expect exception - tx is rolled back.
>                         }
>                     }
>                 }
>             }, 1, "Locker");
>             IgniteInternalFuture<?> fut2 = multithreadedAsync(new Runnable() {
>                 @Override public void run() {
>                     U.awaitQuiet(l);
>                     // Try to acquire lock.
>                     // Acquisition will be successul then first transaction will be rolled
back after timeout.
>                     try (Transaction tx = ignite.transactions().txStart(TransactionConcurrency.PESSIMISTIC,
>                         TransactionIsolation.REPEATABLE_READ, 0, 1)) {
>                         ignite.cache(CACHE_NAME).put(1, 1);
>                         tx.commit();
>                     }
>                 }
>             }, 1, "Waiter");
>             Thread.sleep(TX_TIMEOUT + 1_000);
>             fut2.get(1, TimeUnit.SECONDS);
>             
>             startGrid(1);
>             
>             released.set(true);
>             synchronized (mux) {
>                 mux.notify();
>             }
>         }
>         finally {
>             stopAllGrids();
>         }
>     }
> }
> {noformat}



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