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HADOOP-8208. Disallow self failover. Contributed by Eli Collins

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git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1306935 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Eli Collins 2012-03-29 15:48:58 +00:00
parent f11a5dc5f6
commit 978404d1a8
3 changed files with 38 additions and 2 deletions
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2
hadoop-common-project/hadoop-common/CHANGES.txt
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@ -445,6 +445,8 @@ Release 0.23.2 - UNRELEASED
HADOOP-8088. User-group mapping cache incorrectly does negative caching on
transient failures (Khiwal Lee via bobby)
HADOOP-8208. Disallow self failover. (eli)
Release 0.23.1 - 2012-02-17
INCOMPATIBLE CHANGES

11
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ha/FailoverController.java
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@ -54,16 +54,23 @@ public class FailoverController {
* allow it to become active, eg because it triggers a log roll
* so the standby can learn about new blocks and leave safemode.
*
* @param from currently active service
* @param target service to make active
* @param forceActive ignore toSvc if it reports that it is not ready
* @throws FailoverFailedException if we should avoid failover
*/
private static void preFailoverChecks(HAServiceTarget target,
private static void preFailoverChecks(HAServiceTarget from,
HAServiceTarget target,
boolean forceActive)
throws FailoverFailedException {
HAServiceStatus toSvcStatus;
HAServiceProtocol toSvc;
if (from.getAddress().equals(target.getAddress())) {
throw new FailoverFailedException(
"Can't failover a service to itself");
}
try {
toSvc = target.getProxy();
toSvcStatus = toSvc.getServiceStatus();
@ -146,7 +153,7 @@ public static void failover(HAServiceTarget fromSvc,
throws FailoverFailedException {
Preconditions.checkArgument(fromSvc.getFencer() != null,
"failover requires a fencer");
preFailoverChecks(toSvc, forceActive);
preFailoverChecks(fromSvc, toSvc, forceActive);
// Try to make fromSvc standby
boolean tryFence = true;

27
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ha/TestFailoverController.java
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@ -377,4 +377,31 @@ public void testFailbackToFaultyServiceFails() throws Exception {
assertEquals(HAServiceState.STANDBY, svc1.state);
assertEquals(HAServiceState.STANDBY, svc2.state);
}
@Test
public void testSelfFailoverFails() throws Exception {
DummyHAService svc1 = new DummyHAService(HAServiceState.ACTIVE, svc1Addr);
DummyHAService svc2 = new DummyHAService(HAServiceState.STANDBY, svc2Addr);
svc1.fencer = svc2.fencer = setupFencer(AlwaysSucceedFencer.class.getName());
AlwaysSucceedFencer.fenceCalled = 0;
try {
FailoverController.failover(svc1, svc1, false, false);
fail("Can't failover to yourself");
} catch (FailoverFailedException ffe) {
// Expected
}
assertEquals(0, TestNodeFencer.AlwaysSucceedFencer.fenceCalled);
assertEquals(HAServiceState.ACTIVE, svc1.state);
try {
FailoverController.failover(svc2, svc2, false, false);
fail("Can't failover to yourself");
} catch (FailoverFailedException ffe) {
// Expected
}
assertEquals(0, TestNodeFencer.AlwaysSucceedFencer.fenceCalled);
assertEquals(HAServiceState.STANDBY, svc2.state);
}
}