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YARN-2709. Made timeline client getDelegationToken API retry if ConnectException happens. Contributed by Li Lu.

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This commit is contained in:
Zhijie Shen 2014-10-21 16:06:39 -07:00
parent 4baca311ff
commit b2942762d7
3 changed files with 164 additions and 57 deletions
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3
hadoop-yarn-project/CHANGES.txt
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@ -382,6 +382,9 @@ Release 2.6.0 - UNRELEASED
YARN-90. NodeManager should identify failed disks becoming good again
(Varun Vasudev via jlowe)
YARN-2709. Made timeline client getDelegationToken API retry if ConnectException
happens. (Li Lu via zjshen)
OPTIMIZATIONS
BUG FIXES

125
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/client/api/impl/TimelineClientImpl.java
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@ -107,9 +107,23 @@ public class TimelineClientImpl extends TimelineClient {
private URI resURI;
private boolean isEnabled;
private TimelineJerseyRetryFilter retryFilter;
@Private
@VisibleForTesting
TimelineClientConnectionRetry connectionRetry;
static class TimelineJerseyRetryFilter extends ClientFilter {
// Abstract class for an operation that should be retried by timeline client
private static abstract class TimelineClientRetryOp {
// The operation that should be retried
public abstract Object run() throws IOException;
// The method to indicate if we should retry given the incoming exception
public abstract boolean shouldRetryOn(Exception e);
}
// Class to handle retry
// Outside this class, only visible to tests
@Private
@VisibleForTesting
static class TimelineClientConnectionRetry {
// maxRetries < 0 means keep trying
@Private
@VisibleForTesting
@ -119,14 +133,14 @@ static class TimelineJerseyRetryFilter extends ClientFilter {
@VisibleForTesting
public long retryInterval;
// Indicates if retries happened last time
// Indicates if retries happened last time. Only tests should read it.
// In unit tests, retryOn() calls should _not_ be concurrent.
@Private
@VisibleForTesting
public boolean retried = false;
// Constructor with default retry settings
public TimelineJerseyRetryFilter(Configuration conf) {
super();
public TimelineClientConnectionRetry(Configuration conf) {
maxRetries = conf.getInt(
YarnConfiguration.TIMELINE_SERVICE_CLIENT_MAX_RETRIES,
YarnConfiguration.DEFAULT_TIMELINE_SERVICE_CLIENT_MAX_RETRIES);
@ -135,32 +149,36 @@ public TimelineJerseyRetryFilter(Configuration conf) {
YarnConfiguration.DEFAULT_TIMELINE_SERVICE_CLIENT_RETRY_INTERVAL_MS);
}
@Override
public ClientResponse handle(ClientRequest cr)
throws ClientHandlerException {
public Object retryOn(TimelineClientRetryOp op)
throws RuntimeException, IOException {
int leftRetries = maxRetries;
retried = false;
// keep trying
while (true) {
try {
// try pass the request on, if fail, keep retrying
return getNext().handle(cr);
} catch (ClientHandlerException e) {
// try perform the op, if fail, keep retrying
return op.run();
} catch (IOException e) {
// We may only throw runtime and IO exceptions. After switching to
// Java 1.7, we can merge these two catch blocks into one.
// break if there's no retries left
if (leftRetries == 0) {
break;
}
if(e.getCause() instanceof ConnectException) {
if (leftRetries > 0) {
LOG.info("Connection Timeout (" + cr.getURI() + "), will try "
+ leftRetries + " more time(s).");
if (op.shouldRetryOn(e)) {
logException(e, leftRetries);
} else {
// note that maxRetries may be -1 at the very beginning
// maxRetries = -1 means keep trying
LOG.info("Connection Timeout (" + cr.getURI()
+ "), will keep retrying.");
throw e;
}
retried = true;
} catch (RuntimeException e) {
// break if there's no retries left
if (leftRetries == 0) {
break;
}
if (op.shouldRetryOn(e)) {
logException(e, leftRetries);
} else {
throw e;
}
@ -168,6 +186,7 @@ public ClientResponse handle(ClientRequest cr)
if (leftRetries > 0) {
leftRetries--;
}
retried = true;
try {
// sleep for the given time interval
Thread.sleep(retryInterval);
@ -175,10 +194,51 @@ public ClientResponse handle(ClientRequest cr)
LOG.warn("Client retry sleep interrupted! ");
}
}
throw new ClientHandlerException("Failed to connect to timeline server. "
throw new RuntimeException("Failed to connect to timeline server. "
+ "Connection retries limit exceeded. "
+ "The posted timeline event may be missing");
};
private void logException(Exception e, int leftRetries) {
if (leftRetries > 0) {
LOG.info("Exception caught by TimelineClientConnectionRetry,"
+ " will try " + leftRetries + " more time(s).\nMessage: "
+ e.getMessage());
} else {
// note that maxRetries may be -1 at the very beginning
LOG.info("ConnectionException caught by TimelineClientConnectionRetry,"
+ " will keep retrying.\nMessage: "
+ e.getMessage());
}
}
}
private class TimelineJerseyRetryFilter extends ClientFilter {
@Override
public ClientResponse handle(final ClientRequest cr)
throws ClientHandlerException {
// Set up the retry operation
TimelineClientRetryOp jerseyRetryOp = new TimelineClientRetryOp() {
@Override
public Object run() {
// Try pass the request, if fail, keep retrying
return getNext().handle(cr);
}
@Override
public boolean shouldRetryOn(Exception e) {
// Only retry on connection exceptions
return (e instanceof ClientHandlerException)
&& (e.getCause() instanceof ConnectException);
}
};
try {
return (ClientResponse) connectionRetry.retryOn(jerseyRetryOp);
} catch (IOException e) {
throw new ClientHandlerException("Jersey retry failed!\nMessage: "
+ e.getMessage());
}
}
}
public TimelineClientImpl() {
@ -201,10 +261,12 @@ protected void serviceInit(Configuration conf) throws Exception {
authenticator = new PseudoDelegationTokenAuthenticator();
}
authenticator.setConnectionConfigurator(connConfigurator);
token = new DelegationTokenAuthenticatedURL.Token();
connectionRetry = new TimelineClientConnectionRetry(conf);
client = new Client(new URLConnectionClientHandler(
new TimelineURLConnectionFactory()), cc);
token = new DelegationTokenAuthenticatedURL.Token();
retryFilter = new TimelineJerseyRetryFilter(conf);
TimelineJerseyRetryFilter retryFilter = new TimelineJerseyRetryFilter();
client.addFilter(retryFilter);
if (YarnConfiguration.useHttps(conf)) {
@ -282,6 +344,11 @@ private ClientResponse doPosting(Object obj, String path) throws IOException, Ya
@Override
public Token<TimelineDelegationTokenIdentifier> getDelegationToken(
final String renewer) throws IOException, YarnException {
// Set up the retry operation
TimelineClientRetryOp tokenRetryOp = new TimelineClientRetryOp() {
@Override
public Object run() throws IOException {
// Try pass the request, if fail, keep retrying
boolean isProxyAccess =
UserGroupInformation.getCurrentUser().getAuthenticationMethod()
== UserGroupInformation.AuthenticationMethod.PROXY;
@ -307,11 +374,15 @@ public Token<TimelineDelegationTokenIdentifier> run() throws Exception {
throw new IOException(e);
}
}
@Override
public boolean shouldRetryOn(Exception e) {
// Only retry on connection exceptions
return (e instanceof ConnectException);
}
};
@Private
@VisibleForTesting
public TimelineJerseyRetryFilter getRetryFilter() {
return retryFilter;
return (Token<TimelineDelegationTokenIdentifier>)
connectionRetry.retryOn(tokenRetryOp);
}
@Private

41
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/client/api/impl/TestTimelineClient.java
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@ -27,6 +27,8 @@
import java.net.ConnectException;
import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.yarn.api.records.timeline.TimelineEntities;
import org.apache.hadoop.yarn.api.records.timeline.TimelineEntity;
import org.apache.hadoop.yarn.api.records.timeline.TimelineEvent;
@ -183,8 +185,8 @@ public void testPutDomainConnectionRefused() throws Exception {
@Test
public void testCheckRetryCount() throws Exception {
int newMaxRetries = 1;
long newIntervalMs = 1500;
int newMaxRetries = 5;
long newIntervalMs = 500;
YarnConfiguration conf = new YarnConfiguration();
conf.setInt(YarnConfiguration.TIMELINE_SERVICE_CLIENT_MAX_RETRIES,
newMaxRetries);
@ -197,13 +199,44 @@ public void testCheckRetryCount() throws Exception {
client.putEntities(generateEntity());
Assert.fail("Exception expected!"
+ "Timeline server should be off to run this test. ");
} catch (ClientHandlerException ce) {
} catch (RuntimeException ce) {
Assert.assertTrue(
"Handler exception for reason other than retry: " + ce.getMessage(),
ce.getMessage().contains("Connection retries limit exceeded"));
// we would expect this exception here, check if the client has retried
Assert.assertTrue("Retry filter didn't perform any retries! ", client
.getRetryFilter().retried);
.connectionRetry.retried);
}
}
@Test
public void testTokenRetry() throws Exception {
int newMaxRetries = 5;
long newIntervalMs = 500;
YarnConfiguration conf = new YarnConfiguration();
conf.setInt(YarnConfiguration.TIMELINE_SERVICE_CLIENT_MAX_RETRIES,
newMaxRetries);
conf.setLong(YarnConfiguration.TIMELINE_SERVICE_CLIENT_RETRY_INTERVAL_MS,
newIntervalMs);
conf.setBoolean(YarnConfiguration.TIMELINE_SERVICE_ENABLED, true);
// use kerberos to bypass the issue in HADOOP-11215
conf.set(CommonConfigurationKeysPublic.HADOOP_SECURITY_AUTHENTICATION,
"kerberos");
UserGroupInformation.setConfiguration(conf);
TimelineClientImpl client = createTimelineClient(conf);
try {
// try getting a delegation token
client.getDelegationToken(
UserGroupInformation.getCurrentUser().getShortUserName());
Assert.fail("Exception expected!"
+ "Timeline server should be off to run this test. ");
} catch (RuntimeException ce) {
Assert.assertTrue(
"Handler exception for reason other than retry: " + ce.toString(), ce
.getMessage().contains("Connection retries limit exceeded"));
// we would expect this exception here, check if the client has retried
Assert.assertTrue("Retry filter didn't perform any retries! ",
client.connectionRetry.retried);
}
}