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The following commit(s) were added to refs/heads/master by this push:
new b4c5a7f ZOOKEEPER-3698: fixing NoRouteToHostException when starting
large cluster locally
b4c5a7f is described below
commit b4c5a7fdd0f97aa5a9bf18a345b1cee5b0da967a
Author: Mate Szalay-Beko <[email protected]>
AuthorDate: Thu Jan 23 13:43:39 2020 +0100
ZOOKEEPER-3698: fixing NoRouteToHostException when starting large cluster
locally
When we tested RC 3.6.0, we had a problem of starting ZooKeeper cluster
with large
number (11+) of ensemble members locally on mac. We found exceptions in the
logs
when the new MultiAddress feature tries to filter the unreachable hosts
from the
address list. This involves the calling of the InetAddress.isReachable
method with
a default timeout of 500ms, which goes down to a native call in java and
basically
try to do a ping (an ICMP echo request) to the host. Naturally, the
localhost should
be always reachable.
The problem was that on mac we have the ICMP rate limit set to 250 by
default.
In this patch we:
- changed the reachability check behavior by disabling the check if there
is only
a single address provided (so we wouldn't be able to filter the unreachable
addresses anyway).
- added and documented a configuration parameter to disable the
reachability check
for testing. (default: enabled)
- added and documented a configuration parameter to set the timeout for the
reachability checks. (default: 1000ms)
Author: Mate Szalay-Beko <[email protected]>
Reviewers: [email protected], [email protected]
Closes #1228 from symat/ZOOKEEPER-3698-branch-3.6
(cherry picked from commit 8352f78e752a019387c1eb6095085152e7d1d4ad)
Signed-off-by: Andor Molnar <[email protected]>
---
.../src/main/resources/markdown/zookeeperAdmin.md | 29 ++++++++++++++++++++++
.../apache/zookeeper/server/quorum/Learner.java | 7 +++++-
.../zookeeper/server/quorum/MultipleAddresses.java | 18 +++++++++++++-
.../zookeeper/server/quorum/QuorumCnxManager.java | 26 +++++++++++--------
.../apache/zookeeper/server/quorum/QuorumPeer.java | 22 ++++++++++++++++
.../zookeeper/server/quorum/QuorumPeerConfig.java | 21 ++++++++++++++++
.../zookeeper/server/quorum/QuorumPeerMain.java | 2 ++
.../server/quorum/MultipleAddressesTest.java | 29 ++++++++++++++++++++++
.../server/quorum/QuorumPeerMainTest.java | 2 +-
9 files changed, 143 insertions(+), 13 deletions(-)
diff --git a/zookeeper-docs/src/main/resources/markdown/zookeeperAdmin.md
b/zookeeper-docs/src/main/resources/markdown/zookeeperAdmin.md
index 3fa57ae..6b6113f 100644
--- a/zookeeper-docs/src/main/resources/markdown/zookeeperAdmin.md
+++ b/zookeeper-docs/src/main/resources/markdown/zookeeperAdmin.md
@@ -1567,6 +1567,19 @@ and [SASL authentication for
ZooKeeper](https://cwiki.apache.org/confluence/disp
You can instruct ZooKeeper to remove the realm from the client principal
name during authentication.
(e.g. the zk/[email protected] client principal will be authenticated in
ZooKeeper as zk/myhost)
Default: false
+
+* *multiAddress.reachabilityCheckTimeoutMs* :
+ (Java system property:
**zookeeper.multiAddress.reachabilityCheckTimeoutMs**)
+ **New in 3.6.0:**
+ Since ZooKeeper 3.6.0 you can also [specify multiple
addresses](#id_multi_address)
+ for each ZooKeeper server instance (this can increase availability when
multiple physical
+ network interfaces can be used parallel in the cluster). ZooKeeper will
perform ICMP ECHO requests
+ or try to establish a TCP connection on port 7 (Echo) of the destination
host in order to find
+ the reachable addresses. This happens only if you provide multiple
addresses in the configuration.
+ In this property you can set the timeout in millisecs for the reachability
check. The check happens
+ in parallel for the different addresses, so the timeout you set here is
the maximum time will be taken
+ by checking the reachability of all addresses.
+ The default value is **1000**.
<a name="Experimental+Options%2FFeatures"></a>
@@ -1644,6 +1657,22 @@ the variable does.
ZAB protocol and the Fast Leader Election protocol. Default
value is **false**.
+* *multiAddress.reachabilityCheckEnabled* :
+ (Java system property: **zookeeper.multiAddress.reachabilityCheckEnabled**)
+ **New in 3.6.0:**
+ Since ZooKeeper 3.6.0 you can also [specify multiple
addresses](#id_multi_address)
+ for each ZooKeeper server instance (this can increase availability when
multiple physical
+ network interfaces can be used parallel in the cluster). ZooKeeper will
perform ICMP ECHO requests
+ or try to establish a TCP connection on port 7 (Echo) of the destination
host in order to find
+ the reachable addresses. This happens only if you provide multiple
addresses in the configuration.
+ The reachable check can fail if you hit some ICMP rate-limitation, (e.g.
on MacOS) when you try to
+ start a large (e.g. 11+) ensemble members cluster on a single machine for
testing.
+
+ Default value is **true**. By setting this parameter to 'false' you can
disable the reachability checks.
+ Please note, disabling the reachability check will cause the cluster not
to be able to reconfigure
+ itself properly during network problems, so the disabling is advised only
during testing.
+
+
<a name="Disabling+data+directory+autocreation"></a>
#### Disabling data directory autocreation
diff --git
a/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/Learner.java
b/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/Learner.java
index ad9b0bb..2fd2db4 100644
---
a/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/Learner.java
+++
b/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/Learner.java
@@ -266,7 +266,12 @@ public class Learner {
protected void connectToLeader(MultipleAddresses multiAddr, String
hostname) throws IOException {
this.leaderAddr = multiAddr;
- Set<InetSocketAddress> addresses =
multiAddr.getAllReachableAddresses();
+ Set<InetSocketAddress> addresses;
+ if (self.isMultiAddressReachabilityCheckEnabled()) {
+ addresses = multiAddr.getAllReachableAddresses();
+ } else {
+ addresses = multiAddr.getAllAddresses();
+ }
ExecutorService executor =
Executors.newFixedThreadPool(addresses.size());
CountDownLatch latch = new CountDownLatch(addresses.size());
AtomicReference<Socket> socket = new AtomicReference<>(null);
diff --git
a/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/MultipleAddresses.java
b/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/MultipleAddresses.java
index 730b182..3ee63fa 100644
---
a/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/MultipleAddresses.java
+++
b/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/MultipleAddresses.java
@@ -40,7 +40,7 @@ import java.util.stream.Collectors;
* See ZOOKEEPER-3188 for a discussion of this feature.
*/
public final class MultipleAddresses {
- private static final Duration DEFAULT_TIMEOUT = Duration.ofMillis(500);
+ public static final Duration DEFAULT_TIMEOUT = Duration.ofMillis(1000);
private static Set<InetSocketAddress> newConcurrentHashSet() {
return Collections.newSetFromMap(new ConcurrentHashMap<>());
@@ -150,6 +150,12 @@ public final class MultipleAddresses {
*/
public InetSocketAddress getReachableOrOne() {
InetSocketAddress address;
+
+ // if there is only a single address provided then we don't do any
reachability check
+ if (addresses.size() == 1) {
+ return getOne();
+ }
+
try {
address = getReachableAddress();
} catch (NoRouteToHostException e) {
@@ -179,6 +185,16 @@ public final class MultipleAddresses {
return addresses.iterator().next();
}
+
+ /**
+ * Returns the number of addresses in the set.
+ *
+ * @return the number of addresses.
+ */
+ public int size() {
+ return addresses.size();
+ }
+
private boolean checkIfAddressIsReachable(InetSocketAddress address) {
if (address.isUnresolved()) {
return false;
diff --git
a/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/QuorumCnxManager.java
b/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/QuorumCnxManager.java
index 55c1dc2..a92fc52 100644
---
a/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/QuorumCnxManager.java
+++
b/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/QuorumCnxManager.java
@@ -35,6 +35,7 @@ import java.net.SocketTimeoutException;
import java.nio.BufferUnderflowException;
import java.nio.ByteBuffer;
import java.nio.channels.UnresolvedAddressException;
+import java.time.Duration;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
@@ -534,7 +535,8 @@ public class QuorumCnxManager {
try {
InitialMessage init =
InitialMessage.parse(protocolVersion, din);
sid = init.sid;
- electionAddr = new MultipleAddresses(init.electionAddr);
+ electionAddr = new MultipleAddresses(init.electionAddr,
+
Duration.ofMillis(self.getMultiAddressReachabilityCheckTimeoutMs()));
} catch (InitialMessage.InitialMessageException ex) {
LOG.error(ex.toString());
closeSocket(sock);
@@ -637,10 +639,12 @@ public class QuorumCnxManager {
synchronized boolean connectOne(long sid, MultipleAddresses electionAddr) {
if (senderWorkerMap.get(sid) != null) {
LOG.debug("There is a connection already for server {}", sid);
- // since ZOOKEEPER-3188 we can use multiple election addresses to
reach a server. It is possible, that the
- // one we are using is already dead and we need to clean-up, so
when we will create a new connection
- // then we will choose an other one, which is actually reachable
- senderWorkerMap.get(sid).asyncValidateIfSocketIsStillReachable();
+ if (electionAddr.size() > 1 &&
self.isMultiAddressReachabilityCheckEnabled()) {
+ // since ZOOKEEPER-3188 we can use multiple election addresses
to reach a server. It is possible, that the
+ // one we are using is already dead and we need to clean-up,
so when we will create a new connection
+ // then we will choose an other one, which is actually
reachable
+
senderWorkerMap.get(sid).asyncValidateIfSocketIsStillReachable();
+ }
return true;
}
@@ -653,7 +657,7 @@ public class QuorumCnxManager {
sock = new Socket();
}
setSockOpts(sock);
- sock.connect(electionAddr.getReachableAddress(), cnxTO);
+ sock.connect(electionAddr.getReachableOrOne(), cnxTO);
if (sock instanceof SSLSocket) {
SSLSocket sslSock = (SSLSocket) sock;
sslSock.startHandshake();
@@ -706,10 +710,12 @@ public class QuorumCnxManager {
synchronized void connectOne(long sid) {
if (senderWorkerMap.get(sid) != null) {
LOG.debug("There is a connection already for server {}", sid);
- // since ZOOKEEPER-3188 we can use multiple election addresses to
reach a server. It is possible, that the
- // one we are using is already dead and we need to clean-up, so
when we will create a new connection
- // then we will choose an other one, which is actually reachable
- senderWorkerMap.get(sid).asyncValidateIfSocketIsStillReachable();
+ if (self.isMultiAddressReachabilityCheckEnabled()) {
+ // since ZOOKEEPER-3188 we can use multiple election addresses
to reach a server. It is possible, that the
+ // one we are using is already dead and we need to clean-up,
so when we will create a new connection
+ // then we will choose an other one, which is actually
reachable
+
senderWorkerMap.get(sid).asyncValidateIfSocketIsStillReachable();
+ }
return;
}
synchronized (self.QV_LOCK) {
diff --git
a/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/QuorumPeer.java
b/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/QuorumPeer.java
index c6375cd..977f719 100644
---
a/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/QuorumPeer.java
+++
b/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/QuorumPeer.java
@@ -161,6 +161,28 @@ public class QuorumPeer extends ZooKeeperThread implements
QuorumStats.Provider
this.observerMasterPort = observerMasterPort;
}
+ private int multiAddressReachabilityCheckTimeoutMs = (int)
MultipleAddresses.DEFAULT_TIMEOUT.toMillis();
+
+ public int getMultiAddressReachabilityCheckTimeoutMs() {
+ return multiAddressReachabilityCheckTimeoutMs;
+ }
+
+ public void setMultiAddressReachabilityCheckTimeoutMs(int
multiAddressReachabilityCheckTimeoutMs) {
+ this.multiAddressReachabilityCheckTimeoutMs =
multiAddressReachabilityCheckTimeoutMs;
+ LOG.info("multiAddress.reachabilityCheckTimeoutMs set to {}",
multiAddressReachabilityCheckTimeoutMs);
+ }
+
+ private boolean multiAddressReachabilityCheckEnabled = true;
+
+ public boolean isMultiAddressReachabilityCheckEnabled() {
+ return multiAddressReachabilityCheckEnabled;
+ }
+
+ public void setMultiAddressReachabilityCheckEnabled(boolean
multiAddressReachabilityCheckEnabled) {
+ this.multiAddressReachabilityCheckEnabled =
multiAddressReachabilityCheckEnabled;
+ LOG.info("multiAddress.reachabilityCheckEnabled set to {}",
multiAddressReachabilityCheckEnabled);
+ }
+
public static class QuorumServer {
public MultipleAddresses addr = new MultipleAddresses();
diff --git
a/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/QuorumPeerConfig.java
b/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/QuorumPeerConfig.java
index 99fc2ed..102d699 100644
---
a/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/QuorumPeerConfig.java
+++
b/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/QuorumPeerConfig.java
@@ -120,6 +120,15 @@ public class QuorumPeerConfig {
protected String quorumServerLoginContext =
QuorumAuth.QUORUM_SERVER_SASL_LOGIN_CONTEXT_DFAULT_VALUE;
protected int quorumCnxnThreadsSize;
+ // multi address related configs
+ private boolean multiAddressReachabilityCheckEnabled =
+
Boolean.parseBoolean(System.getProperty("zookeeper.multiAddress.reachabilityCheckEnabled",
+ "true"));
+ private int multiAddressReachabilityCheckTimeoutMs =
+
Integer.parseInt(System.getProperty("zookeeper.multiAddress.reachabilityCheckTimeoutMs",
+
String.valueOf(MultipleAddresses.DEFAULT_TIMEOUT.toMillis())));
+
+
/**
* Minimum snapshot retain count.
* @see org.apache.zookeeper.server.PurgeTxnLog#purge(File, File, int)
@@ -389,6 +398,10 @@ public class QuorumPeerConfig {
} else if (key.startsWith("metricsProvider.")) {
String keyForMetricsProvider = key.substring(16);
metricsProviderConfiguration.put(keyForMetricsProvider, value);
+ } else if (key.equals("multiAddress.reachabilityCheckTimeoutMs")) {
+ multiAddressReachabilityCheckTimeoutMs =
Integer.parseInt(value);
+ } else if (key.equals("multiAddress.reachabilityCheckEnabled")) {
+ multiAddressReachabilityCheckEnabled =
Boolean.parseBoolean(value);
} else {
System.setProperty("zookeeper." + key, value);
}
@@ -926,6 +939,14 @@ public class QuorumPeerConfig {
return quorumListenOnAllIPs;
}
+ public boolean isMultiAddressReachabilityCheckEnabled() {
+ return multiAddressReachabilityCheckEnabled;
+ }
+
+ public int getMultiAddressReachabilityCheckTimeoutMs() {
+ return multiAddressReachabilityCheckTimeoutMs;
+ }
+
public static boolean isStandaloneEnabled() {
return standaloneEnabled;
}
diff --git
a/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/QuorumPeerMain.java
b/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/QuorumPeerMain.java
index 054a47d..04aec05 100644
---
a/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/QuorumPeerMain.java
+++
b/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/QuorumPeerMain.java
@@ -204,6 +204,8 @@ public class QuorumPeerMain {
if (config.sslQuorumReloadCertFiles) {
quorumPeer.getX509Util().enableCertFileReloading();
}
+
quorumPeer.setMultiAddressReachabilityCheckEnabled(config.isMultiAddressReachabilityCheckEnabled());
+
quorumPeer.setMultiAddressReachabilityCheckTimeoutMs(config.getMultiAddressReachabilityCheckTimeoutMs());
// sets quorum sasl authentication configurations
quorumPeer.setQuorumSaslEnabled(config.quorumEnableSasl);
diff --git
a/zookeeper-server/src/test/java/org/apache/zookeeper/server/quorum/MultipleAddressesTest.java
b/zookeeper-server/src/test/java/org/apache/zookeeper/server/quorum/MultipleAddressesTest.java
index 9920320..e8f08c6 100644
---
a/zookeeper-server/src/test/java/org/apache/zookeeper/server/quorum/MultipleAddressesTest.java
+++
b/zookeeper-server/src/test/java/org/apache/zookeeper/server/quorum/MultipleAddressesTest.java
@@ -24,6 +24,7 @@ import java.net.NoRouteToHostException;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Arrays;
+import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
@@ -109,6 +110,26 @@ public class MultipleAddressesTest {
}
@Test
+ public void testGetReachableOrOneWithSingleReachableAddress() {
+ InetSocketAddress reachableAddress = new
InetSocketAddress("127.0.0.1", PortAssignment.unique());
+
+ MultipleAddresses multipleAddresses = new
MultipleAddresses(Collections.singletonList(reachableAddress));
+ InetSocketAddress actualReturnedAddress =
multipleAddresses.getReachableOrOne();
+
+ Assert.assertEquals(reachableAddress, actualReturnedAddress);
+ }
+
+ @Test
+ public void testGetReachableOrOneWithSingleUnreachableAddress() {
+ InetSocketAddress unreachableAddress = new
InetSocketAddress("unreachable.address.zookeeper.apache.com", 1234);
+
+ MultipleAddresses multipleAddresses = new
MultipleAddresses(Collections.singletonList(unreachableAddress));
+ InetSocketAddress actualReturnedAddress =
multipleAddresses.getReachableOrOne();
+
+ Assert.assertEquals(unreachableAddress, actualReturnedAddress);
+ }
+
+ @Test
public void testRecreateSocketAddresses() throws UnknownHostException {
List<InetSocketAddress> searchedAddresses =
Arrays.stream(InetAddress.getAllByName("google.com"))
.map(addr -> new InetSocketAddress(addr,
222)).collect(Collectors.toList());
@@ -180,6 +201,14 @@ public class MultipleAddressesTest {
Assert.assertNotEquals(multipleAddresses, multipleAddressesNotEquals);
}
+ @Test
+ public void testSize() {
+ List<InetSocketAddress> addresses = getAddressList();
+ MultipleAddresses multipleAddresses = new MultipleAddresses(addresses);
+
+ Assert.assertEquals(PORTS_AMOUNT, multipleAddresses.size());
+ }
+
public List<Integer> getPortList() {
return IntStream.range(0, PORTS_AMOUNT).mapToObj(i ->
PortAssignment.unique()).collect(Collectors.toList());
}
diff --git
a/zookeeper-server/src/test/java/org/apache/zookeeper/server/quorum/QuorumPeerMainTest.java
b/zookeeper-server/src/test/java/org/apache/zookeeper/server/quorum/QuorumPeerMainTest.java
index d9666e1..beb3bb9 100644
---
a/zookeeper-server/src/test/java/org/apache/zookeeper/server/quorum/QuorumPeerMainTest.java
+++
b/zookeeper-server/src/test/java/org/apache/zookeeper/server/quorum/QuorumPeerMainTest.java
@@ -470,7 +470,7 @@ public class QuorumPeerMainTest extends QuorumPeerTestBase {
LineNumberReader r = new LineNumberReader(new
StringReader(os.toString()));
String line;
boolean found = false;
- Pattern p = Pattern.compile(".*None of the addresses .* are reachable
for sid 2");
+ Pattern p = Pattern.compile(".*Cannot open channel to .* at election
address .*");
while ((line = r.readLine()) != null) {
found = p.matcher(line).matches();
if (found) {
