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[GitHub] [zookeeper] arshadmohammad opened a new pull request #1664: ZOOKEEPER-4269: acceptedEpoch.tmp rename failure will cause server startup error
arshadmohammad opened a new pull request #1664:
URL: https://github.com/apache/zookeeper/pull/1664
Using accepted epoch from acceptedEpoch.tmp if it is available
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[GitHub] [zookeeper] arshadmohammad commented on a change in pull request #1664: ZOOKEEPER-4269: acceptedEpoch.tmp rename failure will cause server startup error
Posted by GitBox <gi...@apache.org>.
arshadmohammad commented on a change in pull request #1664:
URL: https://github.com/apache/zookeeper/pull/1664#discussion_r603217001
##########
File path: zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/QuorumPeer.java
##########
@@ -1163,10 +1164,18 @@ private void loadDataBase() {
writeLongToFile(CURRENT_EPOCH_FILENAME, currentEpoch);
}
if (epochOfZxid > currentEpoch) {
- throw new IOException("The current epoch, "
- + ZxidUtils.zxidToString(currentEpoch)
- + ", is older than the last zxid, "
- + lastProcessedZxid);
+ // acceptedEpoch.tmp file in snapshot directory
+ File currentTmp = new File(getTxnFactory().getSnapDir(),
+ CURRENT_EPOCH_FILENAME + AtomicFileOutputStream.TMP_EXTENSION);
+ if (currentTmp.exists()) {
+ long epochOfTmp = readLongFromFile(currentTmp.getName());
Review comment:
This is not user input file. It is system generate file so PATH_TRAVERSAL_IN is not applicable
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[GitHub] [zookeeper] arshadmohammad commented on a change in pull request #1664: ZOOKEEPER-4269: acceptedEpoch.tmp rename failure will cause server startup error
Posted by GitBox <gi...@apache.org>.
arshadmohammad commented on a change in pull request #1664:
URL: https://github.com/apache/zookeeper/pull/1664#discussion_r604606916
##########
File path: zookeeper-server/src/test/java/org/apache/zookeeper/server/quorum/CurrentEpochWriteFailureTest.java
##########
@@ -0,0 +1,129 @@
+/*
+ * 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.zookeeper.server.quorum;
+
+import static org.apache.zookeeper.test.ClientBase.CONNECTION_TIMEOUT;
+import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import java.io.File;
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+import org.apache.commons.io.FileUtils;
+import org.apache.zookeeper.CreateMode;
+import org.apache.zookeeper.ZooDefs.Ids;
+import org.apache.zookeeper.ZooKeeper;
+import org.apache.zookeeper.common.AtomicFileOutputStream;
+import org.apache.zookeeper.test.ClientBase;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
Review comment:
good suggestions, handled it
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[GitHub] [zookeeper] arshadmohammad commented on a change in pull request #1664: ZOOKEEPER-4269: acceptedEpoch.tmp rename failure will cause server startup error
Posted by GitBox <gi...@apache.org>.
arshadmohammad commented on a change in pull request #1664:
URL: https://github.com/apache/zookeeper/pull/1664#discussion_r604609197
##########
File path: zookeeper-server/src/test/java/org/apache/zookeeper/server/quorum/CurrentEpochWriteFailureTest.java
##########
@@ -0,0 +1,129 @@
+/*
+ * 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.zookeeper.server.quorum;
+
+import static org.apache.zookeeper.test.ClientBase.CONNECTION_TIMEOUT;
+import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import java.io.File;
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+import org.apache.commons.io.FileUtils;
+import org.apache.zookeeper.CreateMode;
+import org.apache.zookeeper.ZooDefs.Ids;
+import org.apache.zookeeper.ZooKeeper;
+import org.apache.zookeeper.common.AtomicFileOutputStream;
+import org.apache.zookeeper.test.ClientBase;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
Review comment:
After these changes, I run the test class with command "mvn clean test -Dtest=CurrentEpochWriteFailureTest -DfailIfNoTests=false"
It run successfully.
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[GitHub] [zookeeper] ztzg commented on a change in pull request #1664: ZOOKEEPER-4269: acceptedEpoch.tmp rename failure will cause server startup error
Posted by GitBox <gi...@apache.org>.
ztzg commented on a change in pull request #1664:
URL: https://github.com/apache/zookeeper/pull/1664#discussion_r604419892
##########
File path: zookeeper-server/src/test/java/org/apache/zookeeper/server/quorum/CurrentEpochWriteFailureTest.java
##########
@@ -0,0 +1,129 @@
+/*
+ * 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.zookeeper.server.quorum;
+
+import static org.apache.zookeeper.test.ClientBase.CONNECTION_TIMEOUT;
+import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import java.io.File;
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+import org.apache.commons.io.FileUtils;
+import org.apache.zookeeper.CreateMode;
+import org.apache.zookeeper.ZooDefs.Ids;
+import org.apache.zookeeper.ZooKeeper;
+import org.apache.zookeeper.common.AtomicFileOutputStream;
+import org.apache.zookeeper.test.ClientBase;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class CurrentEpochWriteFailureTest extends QuorumPeerTestBase {
+ protected static final Logger LOG = LoggerFactory.getLogger(CurrentEpochWriteFailureTest.class);
+ private Servers servers;
+ private int clientPort;
+ private Map<String, String> additionalProp;
+
+ @Before
+ public void setUp() {
+ additionalProp = new HashMap<>();
+ additionalProp.put("admin.enableServer", "true");
+ additionalProp.put("4lw.commands.whitelist", "*");
Review comment:
I was wondering why these two were necessary—but the test seems to run fine without them. Did you add them for a specific purpose, or did you simply inherit them? (Not that I expect them to hurt.)
##########
File path: zookeeper-server/src/test/java/org/apache/zookeeper/server/quorum/CurrentEpochWriteFailureTest.java
##########
@@ -0,0 +1,129 @@
+/*
+ * 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.zookeeper.server.quorum;
+
+import static org.apache.zookeeper.test.ClientBase.CONNECTION_TIMEOUT;
+import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import java.io.File;
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+import org.apache.commons.io.FileUtils;
+import org.apache.zookeeper.CreateMode;
+import org.apache.zookeeper.ZooDefs.Ids;
+import org.apache.zookeeper.ZooKeeper;
+import org.apache.zookeeper.common.AtomicFileOutputStream;
+import org.apache.zookeeper.test.ClientBase;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
Review comment:
This compiles, but causes the test not to run when selected with `-Dtest=CurrentEpochWriteFailureTest`! (I don't know if it runs when the full test suite is active.)
I believe you want this:
```diff
--- a/zookeeper-server/src/test/java/org/apache/zookeeper/server/quorum/CurrentEpochWriteFailureTest.java
+++ b/zookeeper-server/src/test/java/org/apache/zookeeper/server/quorum/CurrentEpochWriteFailureTest.java
@@ -30,9 +30,9 @@
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.common.AtomicFileOutputStream;
import org.apache.zookeeper.test.ClientBase;
-import org.junit.After;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@@ -42,14 +42,14 @@
private int clientPort;
private Map<String, String> additionalProp;
- @Before
+ @BeforeEach
public void setUp() {
additionalProp = new HashMap<>();
additionalProp.put("admin.enableServer", "true");
additionalProp.put("4lw.commands.whitelist", "*");
}
- @After
+ @AfterEach
public void tearDown() throws InterruptedException {
if (servers != null) {
servers.shutDownAllServers();
```
##########
File path: zookeeper-server/src/test/java/org/apache/zookeeper/server/quorum/CurrentEpochWriteFailureTest.java
##########
@@ -0,0 +1,129 @@
+/*
+ * 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.zookeeper.server.quorum;
+
+import static org.apache.zookeeper.test.ClientBase.CONNECTION_TIMEOUT;
+import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import java.io.File;
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+import org.apache.commons.io.FileUtils;
+import org.apache.zookeeper.CreateMode;
+import org.apache.zookeeper.ZooDefs.Ids;
+import org.apache.zookeeper.ZooKeeper;
+import org.apache.zookeeper.common.AtomicFileOutputStream;
+import org.apache.zookeeper.test.ClientBase;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class CurrentEpochWriteFailureTest extends QuorumPeerTestBase {
+ protected static final Logger LOG = LoggerFactory.getLogger(CurrentEpochWriteFailureTest.class);
+ private Servers servers;
+ private int clientPort;
+ private Map<String, String> additionalProp;
+
+ @Before
+ public void setUp() {
+ additionalProp = new HashMap<>();
+ additionalProp.put("admin.enableServer", "true");
+ additionalProp.put("4lw.commands.whitelist", "*");
+ }
+
+ @After
+ public void tearDown() throws InterruptedException {
+ if (servers != null) {
+ servers.shutDownAllServers();
+ }
+ }
+
+ /*
+ * ZOOKEEPER-4269:
+ * accepted epoch is first written to temporary file acceptedEpoch.tmp then this file is
+ * renamed to acceptedEpoch.
+ * Failure, either because of exception or power-off, in renaming the acceptedEpoch.tmp file
+ * will cause server startup error with message "The current epoch, x, is older than the last
+ * zxid y"
+ * To handle this scenario we should read accepted epoch from this temp file as well.
+ */
+ @Test
+ public void testReadCurrentEpochFromAcceptedEpochTmpFile() throws Exception {
+ startServers(additionalProp);
+ writSomeData();
+
+ restartServers();
+ writSomeData();
+
+ MainThread firstServer = servers.mt[0];
+
+ // As started servers two times, current epoch must be two
+ long currentEpoch = firstServer.getQuorumPeer().getCurrentEpoch();
+ assertEquals(2, currentEpoch);
+
+ // Initialize files for later use
+ File snapDir = firstServer.getQuorumPeer().getTxnFactory().getSnapDir();
+ File currentEpochFile = new File(snapDir, QuorumPeer.CURRENT_EPOCH_FILENAME);
+ File currentEpochTempFile = new File(snapDir,
+ QuorumPeer.CURRENT_EPOCH_FILENAME + AtomicFileOutputStream.TMP_EXTENSION);
+
+ // Shutdown servers
+ servers.shutDownAllServers();
+ waitForAll(servers, ZooKeeper.States.CONNECTING);
+
+ // Create scenario of file currentEpoch.tmp rename to currentEpoch failure.
+ // In this case currentEpoch file will have old epoch and currentEpoch.tmp will have the latest epoch
+ FileUtils.write(currentEpochFile, Long.toString(currentEpoch - 1), "UTF-8");
+ FileUtils.write(currentEpochTempFile, Long.toString(currentEpoch), "UTF-8");
+
+ // Restart the serves, all serves should restart successfully.
+ servers.restartAllServersAndClients(this);
+
+ // Check the first server where problem was injected.
+ assertTrue(ClientBase
+ .waitForServerUp("127.0.0.1:" + firstServer.getClientPort(), CONNECTION_TIMEOUT),
+ "server " + firstServer.getMyid()
+ + " is not up as file currentEpoch.tmp rename to currentEpoch file was failed"
+ + " which lead current epoch inconsistent state.");
+ }
+
+ private void restartServers() throws InterruptedException, IOException {
+ servers.shutDownAllServers();
+ waitForAll(servers, ZooKeeper.States.CONNECTING);
+ servers.restartAllServersAndClients(this);
+ waitForAll(servers, ZooKeeper.States.CONNECTED);
+ }
+
+ private void writSomeData() throws Exception {
Review comment:
Nit: `writeSomeData`?
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[GitHub] [zookeeper] muse-dev[bot] commented on a change in pull request #1664: ZOOKEEPER-4269: acceptedEpoch.tmp rename failure will cause server startup error
Posted by GitBox <gi...@apache.org>.
muse-dev[bot] commented on a change in pull request #1664:
URL: https://github.com/apache/zookeeper/pull/1664#discussion_r603212717
##########
File path: zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/QuorumPeer.java
##########
@@ -1163,10 +1164,18 @@ private void loadDataBase() {
writeLongToFile(CURRENT_EPOCH_FILENAME, currentEpoch);
}
if (epochOfZxid > currentEpoch) {
- throw new IOException("The current epoch, "
- + ZxidUtils.zxidToString(currentEpoch)
- + ", is older than the last zxid, "
- + lastProcessedZxid);
+ // acceptedEpoch.tmp file in snapshot directory
+ File currentTmp = new File(getTxnFactory().getSnapDir(),
+ CURRENT_EPOCH_FILENAME + AtomicFileOutputStream.TMP_EXTENSION);
+ if (currentTmp.exists()) {
+ long epochOfTmp = readLongFromFile(currentTmp.getName());
Review comment:
*PATH_TRAVERSAL_IN:* This API (java/io/File.<init>(Ljava/io/File;Ljava/lang/String;)V) reads a file whose location might be specified by user input [(details)](https://find-sec-bugs.github.io/bugs.htm#PATH_TRAVERSAL_IN)
(at-me [in a reply](https://docs.muse.dev/docs/talk-to-muse/) with `help` or `ignore`)
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[GitHub] [zookeeper] arshadmohammad commented on pull request #1664: ZOOKEEPER-4269: acceptedEpoch.tmp rename failure will cause server startup error
Posted by GitBox <gi...@apache.org>.
arshadmohammad commented on pull request #1664:
URL: https://github.com/apache/zookeeper/pull/1664#issuecomment-810427872
Added test case
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[GitHub] [zookeeper] arshadmohammad commented on a change in pull request #1664: ZOOKEEPER-4269: acceptedEpoch.tmp rename failure will cause server startup error
Posted by GitBox <gi...@apache.org>.
arshadmohammad commented on a change in pull request #1664:
URL: https://github.com/apache/zookeeper/pull/1664#discussion_r604607575
##########
File path: zookeeper-server/src/test/java/org/apache/zookeeper/server/quorum/CurrentEpochWriteFailureTest.java
##########
@@ -0,0 +1,129 @@
+/*
+ * 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.zookeeper.server.quorum;
+
+import static org.apache.zookeeper.test.ClientBase.CONNECTION_TIMEOUT;
+import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import java.io.File;
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+import org.apache.commons.io.FileUtils;
+import org.apache.zookeeper.CreateMode;
+import org.apache.zookeeper.ZooDefs.Ids;
+import org.apache.zookeeper.ZooKeeper;
+import org.apache.zookeeper.common.AtomicFileOutputStream;
+import org.apache.zookeeper.test.ClientBase;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class CurrentEpochWriteFailureTest extends QuorumPeerTestBase {
+ protected static final Logger LOG = LoggerFactory.getLogger(CurrentEpochWriteFailureTest.class);
+ private Servers servers;
+ private int clientPort;
+ private Map<String, String> additionalProp;
+
+ @Before
+ public void setUp() {
+ additionalProp = new HashMap<>();
+ additionalProp.put("admin.enableServer", "true");
+ additionalProp.put("4lw.commands.whitelist", "*");
Review comment:
admin.enableServer, I intended to set false.
But I checked these properties are already set in super class ZKTestCase. So not required. removed it
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[GitHub] [zookeeper] asfgit closed pull request #1664: ZOOKEEPER-4269: acceptedEpoch.tmp rename failure will cause server startup error
Posted by GitBox <gi...@apache.org>.
asfgit closed pull request #1664:
URL: https://github.com/apache/zookeeper/pull/1664
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[GitHub] [zookeeper] arshadmohammad commented on a change in pull request #1664: ZOOKEEPER-4269: acceptedEpoch.tmp rename failure will cause server startup error
Posted by GitBox <gi...@apache.org>.
arshadmohammad commented on a change in pull request #1664:
URL: https://github.com/apache/zookeeper/pull/1664#discussion_r604607654
##########
File path: zookeeper-server/src/test/java/org/apache/zookeeper/server/quorum/CurrentEpochWriteFailureTest.java
##########
@@ -0,0 +1,129 @@
+/*
+ * 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.zookeeper.server.quorum;
+
+import static org.apache.zookeeper.test.ClientBase.CONNECTION_TIMEOUT;
+import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import java.io.File;
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+import org.apache.commons.io.FileUtils;
+import org.apache.zookeeper.CreateMode;
+import org.apache.zookeeper.ZooDefs.Ids;
+import org.apache.zookeeper.ZooKeeper;
+import org.apache.zookeeper.common.AtomicFileOutputStream;
+import org.apache.zookeeper.test.ClientBase;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class CurrentEpochWriteFailureTest extends QuorumPeerTestBase {
+ protected static final Logger LOG = LoggerFactory.getLogger(CurrentEpochWriteFailureTest.class);
+ private Servers servers;
+ private int clientPort;
+ private Map<String, String> additionalProp;
+
+ @Before
+ public void setUp() {
+ additionalProp = new HashMap<>();
+ additionalProp.put("admin.enableServer", "true");
+ additionalProp.put("4lw.commands.whitelist", "*");
+ }
+
+ @After
+ public void tearDown() throws InterruptedException {
+ if (servers != null) {
+ servers.shutDownAllServers();
+ }
+ }
+
+ /*
+ * ZOOKEEPER-4269:
+ * accepted epoch is first written to temporary file acceptedEpoch.tmp then this file is
+ * renamed to acceptedEpoch.
+ * Failure, either because of exception or power-off, in renaming the acceptedEpoch.tmp file
+ * will cause server startup error with message "The current epoch, x, is older than the last
+ * zxid y"
+ * To handle this scenario we should read accepted epoch from this temp file as well.
+ */
+ @Test
+ public void testReadCurrentEpochFromAcceptedEpochTmpFile() throws Exception {
+ startServers(additionalProp);
+ writSomeData();
+
+ restartServers();
+ writSomeData();
+
+ MainThread firstServer = servers.mt[0];
+
+ // As started servers two times, current epoch must be two
+ long currentEpoch = firstServer.getQuorumPeer().getCurrentEpoch();
+ assertEquals(2, currentEpoch);
+
+ // Initialize files for later use
+ File snapDir = firstServer.getQuorumPeer().getTxnFactory().getSnapDir();
+ File currentEpochFile = new File(snapDir, QuorumPeer.CURRENT_EPOCH_FILENAME);
+ File currentEpochTempFile = new File(snapDir,
+ QuorumPeer.CURRENT_EPOCH_FILENAME + AtomicFileOutputStream.TMP_EXTENSION);
+
+ // Shutdown servers
+ servers.shutDownAllServers();
+ waitForAll(servers, ZooKeeper.States.CONNECTING);
+
+ // Create scenario of file currentEpoch.tmp rename to currentEpoch failure.
+ // In this case currentEpoch file will have old epoch and currentEpoch.tmp will have the latest epoch
+ FileUtils.write(currentEpochFile, Long.toString(currentEpoch - 1), "UTF-8");
+ FileUtils.write(currentEpochTempFile, Long.toString(currentEpoch), "UTF-8");
+
+ // Restart the serves, all serves should restart successfully.
+ servers.restartAllServersAndClients(this);
+
+ // Check the first server where problem was injected.
+ assertTrue(ClientBase
+ .waitForServerUp("127.0.0.1:" + firstServer.getClientPort(), CONNECTION_TIMEOUT),
+ "server " + firstServer.getMyid()
+ + " is not up as file currentEpoch.tmp rename to currentEpoch file was failed"
+ + " which lead current epoch inconsistent state.");
+ }
+
+ private void restartServers() throws InterruptedException, IOException {
+ servers.shutDownAllServers();
+ waitForAll(servers, ZooKeeper.States.CONNECTING);
+ servers.restartAllServersAndClients(this);
+ waitForAll(servers, ZooKeeper.States.CONNECTED);
+ }
+
+ private void writSomeData() throws Exception {
Review comment:
Corrected
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