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HDFS-16157. Support configuring DNS record to get list of journal nodes contributed by Leon Gao. (#3284)

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* Add DNS resolution for QJM

* Add log

* Resolve comments

* checkstyle

* typo
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LeonGao 2021-08-25 17:40:12 -07:00 committed by GitHub
parent ad54f5195c
commit b53cae0ffb
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9 changed files with 113 additions and 14 deletions
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11
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
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@ -645,6 +645,17 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
public static final String DFS_NAMENODE_EDITS_PLUGIN_PREFIX = "dfs.namenode.edits.journal-plugin";
public static final String DFS_NAMENODE_EDITS_DIR_REQUIRED_KEY = "dfs.namenode.edits.dir.required";
public static final String DFS_NAMENODE_EDITS_DIR_DEFAULT = "file:///tmp/hadoop/dfs/name";
public static final String
DFS_NAMENODE_EDITS_QJOURNALS_RESOLUTION_ENABLED =
"dfs.namenode.edits.qjournals.resolution-enabled";
public static final boolean
DFS_NAMENODE_EDITS_QJOURNALS_RESOLUTION_ENABLED_DEFAULT = false;
public static final String
DFS_NAMENODE_EDITS_QJOURNALS_RESOLUTION_RESOLVER_IMPL =
"dfs.namenode.edits.qjournals.resolver.impl";
public static final String DFS_METRICS_SESSION_ID_KEY =
HdfsClientConfigKeys.DeprecatedKeys.DFS_METRICS_SESSION_ID_KEY;
public static final String DFS_METRICS_PERCENTILES_INTERVALS_KEY = "dfs.metrics.percentiles.intervals";

6
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSUtil.java
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@ -490,7 +490,7 @@ public static Set<String> getJournalNodeAddresses(
" to append it with namenodeId");
URI uri = new URI(journalsUri);
List<InetSocketAddress> socketAddresses = Util.
getAddressesList(uri);
getAddressesList(uri, conf);
for (InetSocketAddress is : socketAddresses) {
journalNodeList.add(is.getHostName());
}
@ -501,7 +501,7 @@ public static Set<String> getJournalNodeAddresses(
} else {
URI uri = new URI(journalsUri);
List<InetSocketAddress> socketAddresses = Util.
getAddressesList(uri);
getAddressesList(uri, conf);
for (InetSocketAddress is : socketAddresses) {
journalNodeList.add(is.getHostName());
}
@ -512,7 +512,7 @@ public static Set<String> getJournalNodeAddresses(
return journalNodeList;
} else {
URI uri = new URI(journalsUri);
List<InetSocketAddress> socketAddresses = Util.getAddressesList(uri);
List<InetSocketAddress> socketAddresses = Util.getAddressesList(uri, conf);
for (InetSocketAddress is : socketAddresses) {
journalNodeList.add(is.getHostName());
}

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/qjournal/client/QuorumJournalManager.java
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@ -414,7 +414,7 @@ static List<AsyncLogger> createLoggers(Configuration conf,
String nameServiceId)
throws IOException {
List<AsyncLogger> ret = Lists.newArrayList();
List<InetSocketAddress> addrs = Util.getAddressesList(uri);
List<InetSocketAddress> addrs = Util.getAddressesList(uri, conf);
if (addrs.size() % 2 == 0) {
LOG.warn("Quorum journal URI '" + uri + "' has an even number " +
"of Journal Nodes specified. This is not recommended!");

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/qjournal/server/JournalNodeSyncer.java
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@ -315,7 +315,7 @@ private List<InetSocketAddress> getJournalAddrList(String uriStr) throws
IOException {
URI uri = new URI(uriStr);
return Util.getLoggerAddresses(uri,
Sets.newHashSet(jn.getBoundIpcAddress()));
Sets.newHashSet(jn.getBoundIpcAddress()), conf);
}
private void getMissingLogSegments(List<RemoteEditLog> thisJournalEditLogs,

36
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/Util.java
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@ -43,6 +43,8 @@
import org.apache.hadoop.hdfs.server.namenode.ImageServlet;
import org.apache.hadoop.hdfs.util.DataTransferThrottler;
import org.apache.hadoop.io.MD5Hash;
import org.apache.hadoop.net.DomainNameResolver;
import org.apache.hadoop.net.DomainNameResolverFactory;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.security.authentication.client.AuthenticationException;
@ -361,7 +363,7 @@ private static MD5Hash parseMD5Header(HttpURLConnection connection) {
return (header != null) ? new MD5Hash(header) : null;
}
public static List<InetSocketAddress> getAddressesList(URI uri)
public static List<InetSocketAddress> getAddressesList(URI uri, Configuration conf)
throws IOException{
String authority = uri.getAuthority();
Preconditions.checkArgument(authority != null && !authority.isEmpty(),
@ -372,8 +374,35 @@ public static List<InetSocketAddress> getAddressesList(URI uri)
parts[i] = parts[i].trim();
}
boolean resolveNeeded = conf.getBoolean(
DFSConfigKeys.DFS_NAMENODE_EDITS_QJOURNALS_RESOLUTION_ENABLED,
DFSConfigKeys.DFS_NAMENODE_EDITS_QJOURNALS_RESOLUTION_ENABLED_DEFAULT);
DomainNameResolver dnr = DomainNameResolverFactory.newInstance(
conf,
DFSConfigKeys.DFS_NAMENODE_EDITS_QJOURNALS_RESOLUTION_RESOLVER_IMPL);
List<InetSocketAddress> addrs = Lists.newArrayList();
for (String addr : parts) {
if (resolveNeeded) {
LOG.info("Resolving journal address: " + addr);
InetSocketAddress isa = NetUtils.createSocketAddr(
addr, DFSConfigKeys.DFS_JOURNALNODE_RPC_PORT_DEFAULT);
// Get multiple hostnames from domain name if needed,
// for example multiple hosts behind a DNS entry.
int port = isa.getPort();
// QJM should just use FQDN
String[] hostnames = dnr
.getAllResolvedHostnameByDomainName(isa.getHostName(), true);
if (hostnames.length == 0) {
throw new UnknownHostException(addr);
}
for (String h : hostnames) {
addrs.add(NetUtils.createSocketAddr(
h + ":" + port,
DFSConfigKeys.DFS_JOURNALNODE_RPC_PORT_DEFAULT)
);
}
} else {
InetSocketAddress isa = NetUtils.createSocketAddr(
addr, DFSConfigKeys.DFS_JOURNALNODE_RPC_PORT_DEFAULT);
if (isa.isUnresolved()) {
@ -381,12 +410,13 @@ public static List<InetSocketAddress> getAddressesList(URI uri)
}
addrs.add(isa);
}
}
return addrs;
}
public static List<InetSocketAddress> getLoggerAddresses(URI uri,
Set<InetSocketAddress> addrsToExclude) throws IOException {
List<InetSocketAddress> addrsList = getAddressesList(uri);
Set<InetSocketAddress> addrsToExclude, Configuration conf) throws IOException {
List<InetSocketAddress> addrsList = getAddressesList(uri, conf);
addrsList.removeAll(addrsToExclude);
return addrsList;
}

19
hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
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@ -502,6 +502,25 @@
<value>org.apache.hadoop.hdfs.qjournal.client.QuorumJournalManager</value>
</property>
<property>
<name>dfs.namenode.edits.qjournals.resolution-enabled</name>
<value>false</value>
<description>
Determines if the given qjournals address is a domain name which needs to
be resolved.
This is used by namenode to resolve qjournals.
</description>
</property>
<property>
<name>dfs.namenode.edits.qjournals.resolver.impl</name>
<value></value>
<description>
Qjournals resolver implementation used by namenode.
Effective with dfs.namenode.edits.qjournals.resolution-enabled on.
</description>
</property>
<property>
<name>dfs.permissions.enabled</name>
<value>true</value>

9
hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSHighAvailabilityWithQJM.md
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@ -194,6 +194,15 @@ The order in which you set these configurations is unimportant, but the values y
<value>qjournal://node1.example.com:8485;node2.example.com:8485;node3.example.com:8485/mycluster</value>
</property>
You can also configure journal nodes by setting up dns round-robin record to avoid hardcoded names:
<property>
<name>dfs.namenode.edits.qjournals.resolution-enabled</name>
<value>true</value>
</property>
This will require you to configure multiple IPs behind one dns record on the host level, for example round robin DNS.
* **dfs.client.failover.proxy.provider.[nameservice ID]** - the Java class that HDFS clients use to contact the Active NameNode
Configure the name of the Java class which will be used by the DFS Client to

30
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/qjournal/client/TestQuorumJournalManager.java
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@ -33,13 +33,17 @@
import java.io.File;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.TimeoutException;
import org.apache.hadoop.hdfs.server.common.Util;
import org.apache.hadoop.net.MockDomainNameResolver;
import org.apache.hadoop.util.Lists;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@ -1124,6 +1128,32 @@ public void testSelectViaRpcAfterJNRestart() throws Exception {
}
}
@Test
public void testGetJournalAddressListWithResolution() throws Exception {
Configuration configuration = new Configuration();
configuration.setBoolean(
DFSConfigKeys.DFS_NAMENODE_EDITS_QJOURNALS_RESOLUTION_ENABLED, true);
configuration.set(
DFSConfigKeys.DFS_NAMENODE_EDITS_QJOURNALS_RESOLUTION_RESOLVER_IMPL,
MockDomainNameResolver.class.getName());
URI uriWithDomain = URI.create("qjournal://"
+ MockDomainNameResolver.DOMAIN + ":1234" + "/testns");
List<InetSocketAddress> result = Util.getAddressesList(uriWithDomain, configuration);
assertEquals(2, result.size());
assertEquals(new InetSocketAddress(MockDomainNameResolver.FQDN_1, 1234), result.get(0));
assertEquals(new InetSocketAddress(MockDomainNameResolver.FQDN_2, 1234), result.get(1));
uriWithDomain = URI.create("qjournal://"
+ MockDomainNameResolver.UNKNOW_DOMAIN + ":1234" + "/testns");
try{
Util.getAddressesList(uriWithDomain, configuration);
fail("Should throw unknown host exception.");
} catch (UnknownHostException e) {
// expected
}
}
private QuorumJournalManager createSpyingQJM()
throws IOException, URISyntaxException {
AsyncLogger.Factory spyFactory = new AsyncLogger.Factory() {