Maxwell-Guo commented on code in PR #2675: URL: https://github.com/apache/cassandra/pull/2675#discussion_r1318715458
########## test/unit/org/apache/cassandra/io/sstable/CQLSSTableWriterConcurrencyTest.java: ########## @@ -0,0 +1,132 @@ +/* + * 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.cassandra.io.sstable; + +import java.io.IOException; +import java.nio.file.Paths; +import java.util.concurrent.CountDownLatch; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicInteger; + +import org.junit.BeforeClass; +import org.junit.Rule; +import org.junit.Test; +import org.junit.rules.TemporaryFolder; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import org.apache.cassandra.cql3.CQLTester; +import org.apache.cassandra.dht.Murmur3Partitioner; +import org.apache.cassandra.io.util.File; +import org.apache.cassandra.schema.Schema; + +import static org.assertj.core.api.Assertions.assertThat; + +/** + * Tests modifications to the Schema in the {@link CQLSSTableWriter} class while other Schema modifications are + * occurring concurrently + */ +public class CQLSSTableWriterConcurrencyTest extends CQLTester +{ + private static final Logger logger = LoggerFactory.getLogger(CQLSSTableWriterTest.class); + @Rule + public TemporaryFolder tempFolder = new TemporaryFolder(); + + @BeforeClass + public static void setUpClass() + { + CQLTester.setUpClass(); + } + + @Test + public void testConcurrentSchemaModification() throws InterruptedException, IOException + { + String schema = "CREATE TABLE %s (" + + " k int PRIMARY KEY," + + " v1 text," + + " v2 int" + + ")"; + + int nThreads = 20; + ExecutorService pool = Executors.newFixedThreadPool(nThreads); + CountDownLatch latch = new CountDownLatch(nThreads); + AtomicInteger errorCount = new AtomicInteger(); + + // Prepare all the variables required for the test + String[] tableNames = new String[nThreads]; + String[] fullQueries = new String[nThreads]; + String[] insertStatements = new String[nThreads]; + File[] dataDirs = new File[nThreads]; + String baseDataDir = tempFolder.newFolder().getAbsolutePath(); + + for (int i = 0; i < nThreads; i++) + { + tableNames[i] = String.format("table_%02d", i); + fullQueries[i] = String.format(schema, KEYSPACE + '.' + tableNames[i]); + logger.info(fullQueries[i]); + + if (i % 2 != 0) + { + // dataDir and insert statement are only needed for the CQLSSTableWriter class + dataDirs[i] = new File(Paths.get(baseDataDir, KEYSPACE, tableNames[i])); + assert dataDirs[i].tryCreateDirectories(); + insertStatements[i] = String.format("INSERT INTO %s.%s (k, v1, v2) VALUES (?, ?, ?)", KEYSPACE, tableNames[i]); + } + + final int finalI = i; + pool.submit(() -> { + try + { + latch.countDown(); + latch.await(); + + // Invoke all schema modifications roughly at the same time + if (finalI % 2 == 0) + { + schemaChange(fullQueries[finalI]); + // If another thread modified the Schema without the proper synchronization, it's possible + // that the table metadata was swapped out and calling the Keyspace#getColumnFamilyStore + // method will produce an IllegalArgumentException + Schema.instance.getKeyspaceInstance(KEYSPACE).getColumnFamilyStore(tableNames[finalI]); + } + else + { + CQLSSTableWriter.builder() + .inDirectory(dataDirs[finalI]) + .forTable(fullQueries[finalI]) + .withPartitioner(Murmur3Partitioner.instance) + .using(insertStatements[finalI]) + .build(); + } + } + catch (Throwable throwable) + { + logger.error("Error while processing element number {}", finalI, throwable); + errorCount.incrementAndGet(); + } + }); + } + + pool.shutdown(); + assertThat(pool.awaitTermination(1, TimeUnit.MINUTES)).isTrue(); Review Comment: what about if ut just occurs a gc and cost more than one minute and this just faild? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
