bitflicker64 commented on code in PR #3309: URL: https://github.com/apache/hugegraph/pull/3309#discussion_r4241431444
########## hugegraph-pd/hg-pd-test/src/main/java/org/apache/hugegraph/pd/core/store/RaftKVStoreTest.java: ########## @@ -0,0 +1,239 @@ +/* + * 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.hugegraph.pd.core.store; + +import java.nio.ByteBuffer; +import java.util.Collections; +import java.util.List; +import java.util.concurrent.TimeUnit; + +import org.apache.hugegraph.pd.common.PDException; +import org.apache.hugegraph.pd.config.PDConfig; +import org.apache.hugegraph.pd.grpc.Pdpb; +import org.apache.hugegraph.pd.raft.KVOperation; +import org.apache.hugegraph.pd.raft.RaftEngine; +import org.apache.hugegraph.pd.raft.RaftStateMachine; +import org.apache.hugegraph.pd.store.HgKVStore; +import org.apache.hugegraph.pd.store.KV; +import org.apache.hugegraph.pd.store.RaftKVStore; +import org.junit.Assert; +import org.junit.Before; +import org.junit.Test; +import org.mockito.Mockito; + +import com.alipay.sofa.jraft.Iterator; +import com.alipay.sofa.jraft.Status; +import com.alipay.sofa.jraft.entity.Task; +import com.alipay.sofa.jraft.error.RaftError; + +/** + * Covers RaftKVStore as both sides of a raft round trip: writes become serialized raft tasks, + * and the decoded operations are dispatched back onto the local store by invoke(). + */ +public class RaftKVStoreTest { + + private static final byte[] KEY = "key".getBytes(); + private static final byte[] VALUE = "value".getBytes(); + + private HgKVStore store; + private RaftEngine engine; + private RaftKVStore raftStore; + + @Before + public void setUp() { + this.store = Mockito.mock(HgKVStore.class); + this.engine = Mockito.mock(RaftEngine.class); + this.raftStore = new RaftKVStore(this.engine, this.store); + } + + /** + * Makes the mocked engine behave like a single-node leader: the task payload is decoded + * exactly as a follower would decode the log entry, applied, then completed with status. + */ + private void applyTasksAs(Status status) { + Mockito.doAnswer(invocation -> { + Task task = invocation.getArgument(0); + if (status.isOk()) { + ByteBuffer data = task.getData(); + byte[] bytes = new byte[data.remaining()]; + data.get(bytes); + this.raftStore.invoke(KVOperation.fromByteArray(bytes), null); + } + task.getDone().run(status); + return null; + }).when(this.engine).addTask(Mockito.any(Task.class)); + } + + @Test + public void testInitRegistersAsRaftTaskHandler() { + PDConfig config = new PDConfig(); + + this.raftStore.init(config); + + Mockito.verify(this.store).init(config); + Mockito.verify(this.engine).addTaskHandler(this.raftStore); + } + + @Test + public void testReadsAreServedLocallyWithoutRaft() throws PDException { + List<KV> kvs = Collections.singletonList(new KV(KEY, VALUE)); + Mockito.when(this.store.get(KEY)).thenReturn(VALUE); + Mockito.when(this.store.getWithTTL(KEY)).thenReturn(VALUE); + Mockito.when(this.store.getListWithTTL(KEY)).thenReturn(Collections.singletonList(VALUE)); + Mockito.when(this.store.scanPrefix(KEY)).thenReturn(kvs); + Mockito.when(this.store.scanRange(KEY, VALUE)).thenReturn(kvs); + + Assert.assertArrayEquals(VALUE, this.raftStore.get(KEY)); + Assert.assertArrayEquals(VALUE, this.raftStore.getWithTTL(KEY)); + Assert.assertEquals(1, this.raftStore.getListWithTTL(KEY).size()); + Assert.assertSame(kvs, this.raftStore.scanPrefix(KEY)); + Assert.assertSame(kvs, this.raftStore.scanRange(KEY, VALUE)); + + Mockito.verify(this.engine, Mockito.never()).addTask(Mockito.any()); + } + + @Test + public void testWritesReachStoreOnlyThroughRaft() throws PDException { + applyTasksAs(Status.OK()); + + this.raftStore.put(KEY, VALUE); + this.raftStore.putWithTTL(KEY, VALUE, 60L); + this.raftStore.putWithTTL(KEY, VALUE, 5L, TimeUnit.MINUTES); + this.raftStore.remove(KEY); + this.raftStore.removeByPrefix(KEY); + this.raftStore.removeWithTTL(KEY); + this.raftStore.clear(); + + Mockito.verify(this.engine, Mockito.times(7)).addTask(Mockito.any(Task.class)); + Mockito.verify(this.store).put(KEY, VALUE); + Mockito.verify(this.store).putWithTTL(KEY, VALUE, 60L); + Mockito.verify(this.store).putWithTTL(KEY, VALUE, 5L, TimeUnit.MINUTES); + Mockito.verify(this.store).remove(KEY); + Mockito.verify(this.store).removeByPrefix(KEY); + Mockito.verify(this.store).removeWithTTL(KEY); + Mockito.verify(this.store).clear(); + Mockito.verifyNoMoreInteractions(this.store); + } + + @Test + public void testWriteOnNonLeaderIsRejectedAndNotApplied() throws PDException { + // A RaftEngine that has not joined a group is never leader + RaftKVStore notLeader = new RaftKVStore(new RaftEngine(), this.store); + + PDException e = Assert.assertThrows(PDException.class, () -> notLeader.put(KEY, VALUE)); + + Assert.assertTrue(e.getMessage(), + e.getMessage().contains("Error code = " + + Pdpb.ErrorType.NOT_LEADER_VALUE)); + Mockito.verifyNoInteractions(this.store); + } + + @Test + public void testFailedRaftStatusFailsEveryWrite() { + applyTasksAs(new Status(RaftError.EINTERNAL, "injected raft failure")); + + assertWriteFails(() -> this.raftStore.put(KEY, VALUE)); + assertWriteFails(() -> this.raftStore.putWithTTL(KEY, VALUE, 1L)); + assertWriteFails(() -> this.raftStore.putWithTTL(KEY, VALUE, 1L, TimeUnit.SECONDS)); + assertWriteFails(() -> this.raftStore.remove(KEY)); + assertWriteFails(() -> this.raftStore.removeByPrefix(KEY)); + assertWriteFails(() -> this.raftStore.removeWithTTL(KEY)); + assertWriteFails(() -> this.raftStore.clear()); + Mockito.verifyNoInteractions(this.store); + } + + @Test + public void testEngineExceptionFailsWrite() { + Mockito.doThrow(new IllegalStateException("engine closed")) + .when(this.engine).addTask(Mockito.any(Task.class)); + + PDException e = Assert.assertThrows(PDException.class, + () -> this.raftStore.put(KEY, VALUE)); + Assert.assertTrue(e.getMessage(), e.getMessage().contains("engine closed")); + Mockito.verifyNoInteractions(this.store); + } + + @Test + public void testInvokeDispatchesSnapshotPathFromAttach() throws PDException { + this.raftStore.invoke(KVOperation.createSaveSnapshot("/snap/save"), null); + this.raftStore.invoke(KVOperation.createLoadSnapshot("/snap/load"), null); + + Mockito.verify(this.store).saveSnapshot("/snap/save"); + Mockito.verify(this.store).loadSnapshot("/snap/load"); + } + + @Test + public void testInvokeIgnoresGetAndUnknownOperations() throws PDException { + Assert.assertFalse(this.raftStore.invoke(KVOperation.createGet(KEY), null)); + Assert.assertFalse(this.raftStore.invoke(new KVOperation(KEY, VALUE, null, (byte) 0x7F), + null)); + + Mockito.verifyNoInteractions(this.store); + } + + @Test + public void testFollowerReplayAppliesTtlWithUnit() throws Exception { + RaftStateMachine stateMachine = new RaftStateMachine(); + stateMachine.addTaskHandler(this.raftStore); + byte[] entry = KVOperation.createPutWithTTL(KEY, VALUE, 3L, TimeUnit.HOURS) + .toByteArray(); + Iterator iter = Mockito.mock(Iterator.class); + Mockito.when(iter.hasNext()).thenReturn(true, false); + // A follower has no closure for the entry, so it must decode the log data + Mockito.when(iter.done()).thenReturn(null); + Mockito.when(iter.getData()).thenReturn(ByteBuffer.wrap(entry)); + + stateMachine.onApply(iter); + + Mockito.verify(this.store).putWithTTL(KEY, VALUE, 3L, TimeUnit.HOURS); + Mockito.verify(iter).next(); + Mockito.verify(iter, Mockito.never()).setErrorAndRollback(Mockito.anyLong(), + Mockito.any()); + } + + @Test + public void testFollowerReplayStopsOnStoreFailure() throws Exception { + RaftStateMachine stateMachine = new RaftStateMachine(); + stateMachine.addTaskHandler(this.raftStore); + Mockito.doThrow(new PDException(Pdpb.ErrorType.ROCKSDB_WRITE_ERROR_VALUE, "disk full")) + .when(this.store).put(KEY, VALUE); + Iterator iter = Mockito.mock(Iterator.class); + Mockito.when(iter.hasNext()).thenReturn(true); Review Comment: Fixed in 03ffdf0bc: `iter.hasNext()` now returns `true, false`, so a missing early return makes the loop call `next()` once and the `never()` check fails instead of the test running until the heap fills. `RaftKVStoreTest` passed alone twice (10/0) and `pd-core-test` passed with 149/0/0/2. -- This is an automated message from the Apache Git Service. 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