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HDFS-6648. Order of namenodes in ConfiguredFailoverProxyProvider is undefined. Contributed by Inigo Goiri 

(cherry picked from commit b104f3a282)
This commit is contained in:
Chris Douglas 2017-03-20 17:15:13 -07:00
parent 22930b09a0
commit 69f34e812e
3 changed files with 15 additions and 4 deletions
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2
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSUtilClient.java
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@ -351,7 +351,7 @@ public class DFSUtilClient {
static Map<String, InetSocketAddress> getAddressesForNameserviceId(
Configuration conf, String nsId, String defaultValue, String... keys) {
Collection<String> nnIds = getNameNodeIds(conf, nsId);
Map<String, InetSocketAddress> ret = Maps.newHashMap();
Map<String, InetSocketAddress> ret = Maps.newLinkedHashMap();
for (String nnId : emptyAsSingletonNull(nnIds)) {
String suffix = concatSuffixes(nsId, nnId);
String address = getConfValue(defaultValue, suffix, conf, keys);

2
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/HdfsClientConfigKeys.java
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@ -276,6 +276,8 @@ public interface HdfsClientConfigKeys {
String CONNECTION_RETRIES_ON_SOCKET_TIMEOUTS_KEY =
PREFIX + "connection.retries.on.timeouts";
int CONNECTION_RETRIES_ON_SOCKET_TIMEOUTS_DEFAULT = 0;
String RANDOM_ORDER = PREFIX + "random.order";
boolean RANDOM_ORDER_DEFAULT = false;
}
/** dfs.client.write configuration properties */

15
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/ConfiguredFailoverProxyProvider.java
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@ -23,6 +23,7 @@ import java.net.InetSocketAddress;
import java.net.URI;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicBoolean;
@ -43,9 +44,10 @@ import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
/**
* A FailoverProxyProvider implementation which allows one to configure two URIs
* to connect to during fail-over. The first configured address is tried first,
* and on a fail-over event the other address is tried.
* A FailoverProxyProvider implementation which allows one to configure
* multiple URIs to connect to during fail-over. A random configured address is
* tried first, and on a fail-over event the other addresses are tried
* sequentially in a random order.
*/
public class ConfiguredFailoverProxyProvider<T> extends
AbstractNNFailoverProxyProvider<T> {
@ -124,6 +126,13 @@ public class ConfiguredFailoverProxyProvider<T> extends
for (InetSocketAddress address : addressesOfNns) {
proxies.add(new AddressRpcProxyPair<T>(address));
}
// Randomize the list to prevent all clients pointing to the same one
boolean randomized = conf.getBoolean(
HdfsClientConfigKeys.Failover.RANDOM_ORDER,
HdfsClientConfigKeys.Failover.RANDOM_ORDER_DEFAULT);
if (randomized) {
Collections.shuffle(proxies);
}
// The client may have a delegation token set for the logical
// URI of the cluster. Clone this token to apply to each of the