/** * Another regression test for HDFS-2742. This tests the following sequence: - DN does a block * report while file is open. This BR contains the block in RBW state. - The block report is * delayed in reaching the standby. - The file is closed. - The standby processes the OP_ADD and * OP_CLOSE operations before the RBW block report arrives. - The standby should not mark the * block as corrupt. */ @Test public void testRBWReportArrivesAfterEdits() throws Exception { final CountDownLatch brFinished = new CountDownLatch(1); DelayAnswer delayer = new GenericTestUtils.DelayAnswer(LOG) { @Override protected Object passThrough(InvocationOnMock invocation) throws Throwable { try { return super.passThrough(invocation); } finally { // inform the test that our block report went through. brFinished.countDown(); } } }; FSDataOutputStream out = fs.create(TEST_FILE_PATH); try { AppendTestUtil.write(out, 0, 10); out.hflush(); DataNode dn = cluster.getDataNodes().get(0); DatanodeProtocolClientSideTranslatorPB spy = DataNodeTestUtils.spyOnBposToNN(dn, nn2); Mockito.doAnswer(delayer) .when(spy) .blockReport( Mockito.<DatanodeRegistration>anyObject(), Mockito.anyString(), Mockito.<StorageBlockReport[]>anyObject()); dn.scheduleAllBlockReport(0); delayer.waitForCall(); } finally { IOUtils.closeStream(out); } cluster.transitionToStandby(0); cluster.transitionToActive(1); delayer.proceed(); brFinished.await(); // Verify that no replicas are marked corrupt, and that the // file is readable from the failed-over standby. BlockManagerTestUtil.updateState(nn1.getNamesystem().getBlockManager()); BlockManagerTestUtil.updateState(nn2.getNamesystem().getBlockManager()); assertEquals(0, nn1.getNamesystem().getCorruptReplicaBlocks()); assertEquals(0, nn2.getNamesystem().getCorruptReplicaBlocks()); DFSTestUtil.readFile(fs, TEST_FILE_PATH); }