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HDFS-5371. Let client retry the same NN when dfs.client.test.drop.namenode.response.number is enabled. Contributed by Jing Zhao. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1540197 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Jing Zhao 2013-11-08 21:39:58 +00:00
parent f2ad787a27
commit a4bc1a6218
3 changed files with 14 additions and 13 deletions
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4
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/retry/LossyRetryInvocationHandler.java
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@ -18,9 +18,9 @@
package org.apache.hadoop.io.retry;
import java.lang.reflect.Method;
import java.net.UnknownHostException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.ipc.RetriableException;
/**
* A dummy invocation handler extending RetryInvocationHandler. It drops the
@ -52,7 +52,7 @@ public class LossyRetryInvocationHandler<T> extends RetryInvocationHandler<T> {
if (retryCount < this.numToDrop) {
RetryCount.set(++retryCount);
LOG.info("Drop the response. Current retryCount == " + retryCount);
throw new UnknownHostException("Fake Exception");
throw new RetriableException("Fake Exception");
} else {
LOG.info("retryCount == " + retryCount
+ ". It's time to normally process the response");

20
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/retry/RetryPolicies.java
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@ -558,20 +558,20 @@ public class RetryPolicies {
isWrappedStandbyException(e)) {
return new RetryAction(RetryAction.RetryDecision.FAILOVER_AND_RETRY,
getFailoverOrRetrySleepTime(failovers));
} else if (e instanceof SocketException ||
(e instanceof IOException && !(e instanceof RemoteException))) {
} else if (e instanceof RetriableException
|| getWrappedRetriableException(e) != null) {
// RetriableException or RetriableException wrapped
return new RetryAction(RetryAction.RetryDecision.RETRY,
getFailoverOrRetrySleepTime(retries));
} else if (e instanceof SocketException
|| (e instanceof IOException && !(e instanceof RemoteException))) {
if (isIdempotentOrAtMostOnce) {
return RetryAction.FAILOVER_AND_RETRY;
} else {
return new RetryAction(RetryAction.RetryDecision.FAIL, 0,
"the invoked method is not idempotent, and unable to determine " +
"whether it was invoked");
"the invoked method is not idempotent, and unable to determine "
+ "whether it was invoked");
}
} else {
RetriableException re = getWrappedRetriableException(e);
if (re != null) {
return new RetryAction(RetryAction.RetryDecision.RETRY,
getFailoverOrRetrySleepTime(retries));
} else {
return fallbackPolicy.shouldRetry(e, retries, failovers,
isIdempotentOrAtMostOnce);
@ -579,8 +579,6 @@ public class RetryPolicies {
}
}
}
/**
* Return a value which is <code>time</code> increasing exponentially as a
* function of <code>retries</code>, +/- 0%-50% of that value, chosen

3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -457,6 +457,9 @@ Release 2.3.0 - UNRELEASED
HDFS-5436. Move HsFtpFileSystem and HFtpFileSystem into org.apache.hdfs.web
(Haohui Mai via Arpit Agarwal)
HDFS-5371. Let client retry the same NN when
"dfs.client.test.drop.namenode.response.number" is enabled. (jing9)
OPTIMIZATIONS
HDFS-5239. Allow FSNamesystem lock fairness to be configurable (daryn)