YARN-8333. Load balance YARN services using RegistryDNS multiple A records. Contributed by Eric Yang
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6468071f13
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6bc92e304f
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@ -290,6 +290,26 @@ public abstract class BaseServiceRecordProcessor
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domain));
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}
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/**
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* Return the DNS name constructed from the component name.
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*
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* @return the DNS naem.
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* @throws PathNotFoundException
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* @throws TextParseException
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*/
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protected Name getComponentName()
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throws PathNotFoundException, TextParseException {
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String service = RegistryPathUtils.lastPathEntry(
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RegistryPathUtils.parentOf(RegistryPathUtils.parentOf(getPath())));
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String component = getRecord().get("yarn:component").toLowerCase();
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String user = RegistryPathUtils.getUsername(getPath());
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return Name.fromString(MessageFormat.format("{0}.{1}.{2}.{3}",
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component,
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service,
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user,
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domain));
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}
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}
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/**
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@ -242,7 +242,8 @@ public class ContainerServiceRecordProcessor extends
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}
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try {
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this.setTarget(InetAddress.getByName(ip));
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this.setNames(new Name[] {getContainerName(), getContainerIDName()});
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this.setNames(new Name[] {getContainerName(), getContainerIDName(),
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getComponentName()});
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} catch (Exception e) {
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throw new IllegalStateException(e);
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}
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@ -115,32 +115,47 @@ public class TestRegistryDNS extends Assert {
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+ "}\n";
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static final String CONTAINER_RECORD = "{\n"
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+ " \"type\" : \"JSONServiceRecord\",\n"
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+ " \"description\" : \"COMP-NAME\",\n"
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+ " \"description\" : \"httpd-1\",\n"
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+ " \"external\" : [ ],\n"
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+ " \"internal\" : [ ],\n"
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+ " \"yarn:id\" : \"container_e50_1451931954322_0016_01_000002\",\n"
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+ " \"yarn:persistence\" : \"container\",\n"
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+ " \"yarn:ip\" : \"172.17.0.19\",\n"
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+ " \"yarn:hostname\" : \"0a134d6329ba\"\n"
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+ " \"yarn:hostname\" : \"host1\",\n"
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+ " \"yarn:component\" : \"httpd\"\n"
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+ "}\n";
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static final String CONTAINER_RECORD2 = "{\n"
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+ " \"type\" : \"JSONServiceRecord\",\n"
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+ " \"description\" : \"httpd-2\",\n"
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+ " \"external\" : [ ],\n"
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+ " \"internal\" : [ ],\n"
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+ " \"yarn:id\" : \"container_e50_1451931954322_0016_01_000003\",\n"
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+ " \"yarn:persistence\" : \"container\",\n"
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+ " \"yarn:ip\" : \"172.17.0.20\",\n"
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+ " \"yarn:hostname\" : \"host2\",\n"
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+ " \"yarn:component\" : \"httpd\"\n"
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+ "}\n";
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private static final String CONTAINER_RECORD_NO_IP = "{\n"
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+ " \"type\" : \"JSONServiceRecord\",\n"
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+ " \"description\" : \"COMP-NAME\",\n"
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+ " \"description\" : \"httpd-1\",\n"
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+ " \"external\" : [ ],\n"
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+ " \"internal\" : [ ],\n"
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+ " \"yarn:id\" : \"container_e50_1451931954322_0016_01_000002\",\n"
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+ " \"yarn:persistence\" : \"container\"\n"
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+ " \"yarn:persistence\" : \"container\",\n"
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+ " \"yarn:component\" : \"httpd\"\n"
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+ "}\n";
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private static final String CONTAINER_RECORD_YARN_PERSISTANCE_ABSENT = "{\n"
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+ " \"type\" : \"JSONServiceRecord\",\n"
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+ " \"description\" : \"COMP-NAME\",\n"
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+ " \"description\" : \"httpd-1\",\n"
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+ " \"external\" : [ ],\n"
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+ " \"internal\" : [ ],\n"
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+ " \"yarn:id\" : \"container_e50_1451931954322_0016_01_000003\",\n"
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+ " \"yarn:ip\" : \"172.17.0.19\",\n"
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+ " \"yarn:hostname\" : \"0a134d6329bb\"\n"
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+ " \"yarn:hostname\" : \"0a134d6329bb\",\n"
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+ " \"yarn:component\" : \"httpd\""
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+ "}\n";
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@Before
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@ -229,7 +244,7 @@ public class TestRegistryDNS extends Assert {
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assertEquals("wrong result", "172.17.0.19",
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((ARecord) recs[0]).getAddress().getHostAddress());
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recs = assertDNSQuery("comp-name.test1.root.dev.test.", 1);
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recs = assertDNSQuery("httpd-1.test1.root.dev.test.", 1);
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assertTrue("not an ARecord", recs[0] instanceof ARecord);
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}
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@ -268,7 +283,7 @@ public class TestRegistryDNS extends Assert {
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((ARecord) recs[0]).getAddress().getHostAddress());
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assertEquals("wrong ttl", 30L, recs[0].getTTL());
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recs = assertDNSQuery("comp-name.test1.root.dev.test.", 1);
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recs = assertDNSQuery("httpd-1.test1.root.dev.test.", 1);
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assertTrue("not an ARecord", recs[0] instanceof ARecord);
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assertEquals("wrong ttl", 30L, recs[0].getTTL());
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@ -286,7 +301,7 @@ public class TestRegistryDNS extends Assert {
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// start assessing whether correct records are available
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Record[] recs = assertDNSQuery("19.0.17.172.in-addr.arpa.", Type.PTR, 1);
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assertEquals("wrong result",
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"comp-name.test1.root.dev.test.",
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"httpd-1.test1.root.dev.test.",
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((PTRRecord) recs[0]).getTarget().toString());
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}
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@ -312,7 +327,7 @@ public class TestRegistryDNS extends Assert {
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// start assessing whether correct records are available
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Record[] recs = assertDNSQuery("19.0.17.172.in-addr.arpa.", Type.PTR, 1);
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assertEquals("wrong result",
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"comp-name.test1.root.dev.test.",
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"httpd-1.test1.root.dev.test.",
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((PTRRecord) recs[0]).getTarget().toString());
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}
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@ -490,7 +505,7 @@ public class TestRegistryDNS extends Assert {
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assertEquals("wrong result", "172.17.0.19",
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((AAAARecord) recs[0]).getAddress().getHostAddress());
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recs = assertDNSQuery("comp-name.test1.root.dev.test.", Type.AAAA, 1);
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recs = assertDNSQuery("httpd-1.test1.root.dev.test.", Type.AAAA, 1);
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assertTrue("not an ARecord", recs[0] instanceof AAAARecord);
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}
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@ -565,13 +580,13 @@ public class TestRegistryDNS extends Assert {
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assertEquals("wrong result", "172.17.0.19",
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((ARecord) recs[0]).getAddress().getHostAddress());
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recs = assertDNSQuery("comp-name.test1.root.dev.test.", 1);
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recs = assertDNSQuery("httpd-1.test1.root.dev.test.", 1);
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assertTrue("not an ARecord", recs[0] instanceof ARecord);
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// lookup dyanmic reverse records
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recs = assertDNSQuery("19.0.17.172.in-addr.arpa.", Type.PTR, 1);
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assertEquals("wrong result",
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"comp-name.test1.root.dev.test.",
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"httpd-1.test1.root.dev.test.",
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((PTRRecord) recs[0]).getTarget().toString());
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// now lookup static reverse records
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@ -649,6 +664,27 @@ public class TestRegistryDNS extends Assert {
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assertDNSQueryNotNull("mail.yahoo.com.", Type.CNAME);
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}
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@Test
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public void testMultiARecord() throws Exception {
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ServiceRecord record = getMarshal().fromBytes("somepath",
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CONTAINER_RECORD.getBytes());
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ServiceRecord record2 = getMarshal().fromBytes("somepath",
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CONTAINER_RECORD2.getBytes());
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getRegistryDNS().register(
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"/registry/users/root/services/org-apache-slider/test1/components/"
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+ "ctr-e50-1451931954322-0016-01-000002",
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record);
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getRegistryDNS().register(
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"/registry/users/root/services/org-apache-slider/test1/components/"
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+ "ctr-e50-1451931954322-0016-01-000003",
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record2);
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// start assessing whether correct records are available
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Record[] recs =
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assertDNSQuery("httpd.test1.root.dev.test.", 2);
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assertTrue("not an ARecord", recs[0] instanceof ARecord);
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assertTrue("not an ARecord", recs[1] instanceof ARecord);
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}
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public RegistryDNS getRegistryDNS() {
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return registryDNS;
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}
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@ -65,6 +65,18 @@ Note that YARN service framework assigns `COMPONENT_INSTANCE_NAME` for each cont
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assigned `0` since it is the first and only instance for the `hbasemaster` component. In case of `regionserver` component, it can have multiple containers
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and so be named as such: `regionserver-0`, `regionserver-1`, `regionserver-2` ... etc
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Each YARN service component also has Multi-A Records for container fault tolerance or load balancing via RegistryDNS. The naming format is defined as:
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```
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${COMPONENT_NAME}.${SERVICE_NAME}.${USER}.${DOMAIN}
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```
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For example, a component named www for application app launched by Chuck with 3 containers will have DNS records that look like:
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```
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www.app.chuck.example.com IN A 123.123.123.1
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www.app.chuck.example.com IN A 123.123.123.1
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www.app.chuck.example.com IN A 123.123.123.1
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```
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`Disclaimer`: The DNS implementation is still experimental. It should not be used as a fully-functional DNS.
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