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YARN-8333. Load balance YARN services using RegistryDNS multiple A records. Contributed by Eric Yang

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This commit is contained in:
Billie Rinaldi 2018-05-31 06:46:34 -07:00
parent 6468071f13
commit 6bc92e304f
4 changed files with 84 additions and 15 deletions
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20
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-registry/src/main/java/org/apache/hadoop/registry/server/dns/BaseServiceRecordProcessor.java
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@ -290,6 +290,26 @@ protected Name getContainerName()
domain));
}
/**
* Return the DNS name constructed from the component name.
*
* @return the DNS naem.
* @throws PathNotFoundException
* @throws TextParseException
*/
protected Name getComponentName()
throws PathNotFoundException, TextParseException {
String service = RegistryPathUtils.lastPathEntry(
RegistryPathUtils.parentOf(RegistryPathUtils.parentOf(getPath())));
String component = getRecord().get("yarn:component").toLowerCase();
String user = RegistryPathUtils.getUsername(getPath());
return Name.fromString(MessageFormat.format("{0}.{1}.{2}.{3}",
component,
service,
user,
domain));
}
}
/**

3
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-registry/src/main/java/org/apache/hadoop/registry/server/dns/ContainerServiceRecordProcessor.java
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@ -242,7 +242,8 @@ public AContainerRecordDescriptor(String path,
}
try {
this.setTarget(InetAddress.getByName(ip));
this.setNames(new Name[] {getContainerName(), getContainerIDName()});
this.setNames(new Name[] {getContainerName(), getContainerIDName(),
getComponentName()});
} catch (Exception e) {
throw new IllegalStateException(e);
}

62
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-registry/src/test/java/org/apache/hadoop/registry/server/dns/TestRegistryDNS.java
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@ -115,32 +115,47 @@ public class TestRegistryDNS extends Assert {
+ "}\n";
static final String CONTAINER_RECORD = "{\n"
+ " \"type\" : \"JSONServiceRecord\",\n"
+ " \"description\" : \"COMP-NAME\",\n"
+ " \"description\" : \"httpd-1\",\n"
+ " \"external\" : [ ],\n"
+ " \"internal\" : [ ],\n"
+ " \"yarn:id\" : \"container_e50_1451931954322_0016_01_000002\",\n"
+ " \"yarn:persistence\" : \"container\",\n"
+ " \"yarn:ip\" : \"172.17.0.19\",\n"
+ " \"yarn:hostname\" : \"0a134d6329ba\"\n"
+ " \"yarn:hostname\" : \"host1\",\n"
+ " \"yarn:component\" : \"httpd\"\n"
+ "}\n";
static final String CONTAINER_RECORD2 = "{\n"
+ " \"type\" : \"JSONServiceRecord\",\n"
+ " \"description\" : \"httpd-2\",\n"
+ " \"external\" : [ ],\n"
+ " \"internal\" : [ ],\n"
+ " \"yarn:id\" : \"container_e50_1451931954322_0016_01_000003\",\n"
+ " \"yarn:persistence\" : \"container\",\n"
+ " \"yarn:ip\" : \"172.17.0.20\",\n"
+ " \"yarn:hostname\" : \"host2\",\n"
+ " \"yarn:component\" : \"httpd\"\n"
+ "}\n";
private static final String CONTAINER_RECORD_NO_IP = "{\n"
+ " \"type\" : \"JSONServiceRecord\",\n"
+ " \"description\" : \"COMP-NAME\",\n"
+ " \"description\" : \"httpd-1\",\n"
+ " \"external\" : [ ],\n"
+ " \"internal\" : [ ],\n"
+ " \"yarn:id\" : \"container_e50_1451931954322_0016_01_000002\",\n"
+ " \"yarn:persistence\" : \"container\"\n"
+ " \"yarn:persistence\" : \"container\",\n"
+ " \"yarn:component\" : \"httpd\"\n"
+ "}\n";
private static final String CONTAINER_RECORD_YARN_PERSISTANCE_ABSENT = "{\n"
+ " \"type\" : \"JSONServiceRecord\",\n"
+ " \"description\" : \"COMP-NAME\",\n"
+ " \"description\" : \"httpd-1\",\n"
+ " \"external\" : [ ],\n"
+ " \"internal\" : [ ],\n"
+ " \"yarn:id\" : \"container_e50_1451931954322_0016_01_000003\",\n"
+ " \"yarn:ip\" : \"172.17.0.19\",\n"
+ " \"yarn:hostname\" : \"0a134d6329bb\"\n"
+ " \"yarn:hostname\" : \"0a134d6329bb\",\n"
+ " \"yarn:component\" : \"httpd\""
+ "}\n";
@Before
@ -229,7 +244,7 @@ public void testContainerRegistration() throws Exception {
assertEquals("wrong result", "172.17.0.19",
((ARecord) recs[0]).getAddress().getHostAddress());
recs = assertDNSQuery("comp-name.test1.root.dev.test.", 1);
recs = assertDNSQuery("httpd-1.test1.root.dev.test.", 1);
assertTrue("not an ARecord", recs[0] instanceof ARecord);
}
@ -268,7 +283,7 @@ public void testRecordTTL() throws Exception {
((ARecord) recs[0]).getAddress().getHostAddress());
assertEquals("wrong ttl", 30L, recs[0].getTTL());
recs = assertDNSQuery("comp-name.test1.root.dev.test.", 1);
recs = assertDNSQuery("httpd-1.test1.root.dev.test.", 1);
assertTrue("not an ARecord", recs[0] instanceof ARecord);
assertEquals("wrong ttl", 30L, recs[0].getTTL());
@ -286,7 +301,7 @@ public void testReverseLookup() throws Exception {
// start assessing whether correct records are available
Record[] recs = assertDNSQuery("19.0.17.172.in-addr.arpa.", Type.PTR, 1);
assertEquals("wrong result",
"comp-name.test1.root.dev.test.",
"httpd-1.test1.root.dev.test.",
((PTRRecord) recs[0]).getTarget().toString());
}
@ -312,7 +327,7 @@ public void testReverseLookupInLargeNetwork() throws Exception {
// start assessing whether correct records are available
Record[] recs = assertDNSQuery("19.0.17.172.in-addr.arpa.", Type.PTR, 1);
assertEquals("wrong result",
"comp-name.test1.root.dev.test.",
"httpd-1.test1.root.dev.test.",
((PTRRecord) recs[0]).getTarget().toString());
}
@ -490,7 +505,7 @@ public void testAAAALookup() throws Exception {
assertEquals("wrong result", "172.17.0.19",
((AAAARecord) recs[0]).getAddress().getHostAddress());
recs = assertDNSQuery("comp-name.test1.root.dev.test.", Type.AAAA, 1);
recs = assertDNSQuery("httpd-1.test1.root.dev.test.", Type.AAAA, 1);
assertTrue("not an ARecord", recs[0] instanceof AAAARecord);
}
@ -565,13 +580,13 @@ public void testReadMasterFile() throws Exception {
assertEquals("wrong result", "172.17.0.19",
((ARecord) recs[0]).getAddress().getHostAddress());
recs = assertDNSQuery("comp-name.test1.root.dev.test.", 1);
recs = assertDNSQuery("httpd-1.test1.root.dev.test.", 1);
assertTrue("not an ARecord", recs[0] instanceof ARecord);
// lookup dyanmic reverse records
recs = assertDNSQuery("19.0.17.172.in-addr.arpa.", Type.PTR, 1);
assertEquals("wrong result",
"comp-name.test1.root.dev.test.",
"httpd-1.test1.root.dev.test.",
((PTRRecord) recs[0]).getTarget().toString());
// now lookup static reverse records
@ -649,6 +664,27 @@ public void testExternalCNAMERecord() throws Exception {
assertDNSQueryNotNull("mail.yahoo.com.", Type.CNAME);
}
@Test
public void testMultiARecord() throws Exception {
ServiceRecord record = getMarshal().fromBytes("somepath",
CONTAINER_RECORD.getBytes());
ServiceRecord record2 = getMarshal().fromBytes("somepath",
CONTAINER_RECORD2.getBytes());
getRegistryDNS().register(
"/registry/users/root/services/org-apache-slider/test1/components/"
+ "ctr-e50-1451931954322-0016-01-000002",
record);
getRegistryDNS().register(
"/registry/users/root/services/org-apache-slider/test1/components/"
+ "ctr-e50-1451931954322-0016-01-000003",
record2);
// start assessing whether correct records are available
Record[] recs =
assertDNSQuery("httpd.test1.root.dev.test.", 2);
assertTrue("not an ARecord", recs[0] instanceof ARecord);
assertTrue("not an ARecord", recs[1] instanceof ARecord);
}
public RegistryDNS getRegistryDNS() {
return registryDNS;
}

14
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/yarn-service/ServiceDiscovery.md
View File

@ -65,6 +65,18 @@ Note that YARN service framework assigns `COMPONENT_INSTANCE_NAME` for each cont
assigned `0` since it is the first and only instance for the `hbasemaster` component. In case of `regionserver` component, it can have multiple containers
and so be named as such: `regionserver-0`, `regionserver-1`, `regionserver-2` ... etc
Each YARN service component also has Multi-A Records for container fault tolerance or load balancing via RegistryDNS. The naming format is defined as:
```
${COMPONENT_NAME}.${SERVICE_NAME}.${USER}.${DOMAIN}
```
For example, a component named www for application app launched by Chuck with 3 containers will have DNS records that look like:
```
www.app.chuck.example.com IN A 123.123.123.1
www.app.chuck.example.com IN A 123.123.123.1
www.app.chuck.example.com IN A 123.123.123.1
```
`Disclaimer`: The DNS implementation is still experimental. It should not be used as a fully-functional DNS.
@ -140,4 +152,4 @@ You can edit the `/etc/resolv.conf` to make your system use the registry DNS suc
```
nameserver 192.168.154.3
```
Alternatively, if you have a corporate DNS in your organization, you can configure zone forwarding so that the Registry DNS resolves hostnames for the domain used by the cluster.
Alternatively, if you have a corporate DNS in your organization, you can configure zone forwarding so that the Registry DNS resolves hostnames for the domain used by the cluster.