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HDFS-4210. Throw helpful exception when DNS entry for JournalNode cannot be resolved. Contributed by Charles Lamb and John Zhuge. 

(cherry picked from commit 046f6bf0f944311fc70de3a96fc6ab8211cbbbd8)
This commit is contained in:
Xiao Chen 2016-08-29 17:41:01 -07:00
parent 3b19bcb8f0
commit 72863f0049
2 changed files with 25 additions and 3 deletions
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9
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/qjournal/client/QuorumJournalManager.java
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@ -21,6 +21,7 @@ import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.URI;
import java.net.URL;
import java.net.UnknownHostException;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
@ -387,8 +388,12 @@ public class QuorumJournalManager implements JournalManager {
List<InetSocketAddress> addrs = Lists.newArrayList();
for (String addr : parts) {
addrs.add(NetUtils.createSocketAddr(
addr, DFSConfigKeys.DFS_JOURNALNODE_RPC_PORT_DEFAULT));
InetSocketAddress isa = NetUtils.createSocketAddr(
addr, DFSConfigKeys.DFS_JOURNALNODE_RPC_PORT_DEFAULT);
if (isa.isUnresolved()) {
throw new UnknownHostException(addr);
}
addrs.add(isa);
}
return addrs;
}

17
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/qjournal/client/TestQJMWithFaults.java
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@ -27,7 +27,9 @@ import java.io.Closeable;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.net.InetSocketAddress;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.UnknownHostException;
import java.util.List;
import java.util.Map;
import java.util.Random;
@ -52,7 +54,9 @@ import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.ipc.ProtobufRpcEngine;
import org.apache.hadoop.test.GenericTestUtils;
import org.apache.log4j.Level;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import org.mockito.Mockito;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;
@ -126,6 +130,9 @@ public class TestQJMWithFaults {
return ret;
}
@Rule
public ExpectedException expectedException = ExpectedException.none();
/**
* Sets up two of the nodes to each drop a single RPC, at all
* possible combinations of RPCs. This may result in the
@ -186,6 +193,16 @@ public class TestQJMWithFaults {
}
}
/**
* Expect {@link UnknownHostException} if a hostname can't be resolved.
*/
@Test
public void testUnresolvableHostName() throws Exception {
expectedException.expect(UnknownHostException.class);
new QuorumJournalManager(conf,
new URI("qjournal://" + "bogus:12345" + "/" + JID), FAKE_NSINFO);
}
/**
* Test case in which three JournalNodes randomly flip flop between
* up and down states every time they get an RPC.