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HDFS-4269. Datanode rejects all datanode registrations from localhost in single-node developer setup on Windows. Contributed by Chris Nauroth. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1420492 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Suresh Srinivas 2012-12-12 00:14:26 +00:00
parent 8c2846510e
commit f31b8270db
2 changed files with 22 additions and 1 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -269,6 +269,9 @@ Trunk (Unreleased)
HDFS-4260 Fix HDFS tests to set test dir to a valid HDFS path as opposed
to the local build path (Chri Nauroth via Sanjay)
HDFS-4269. Datanode rejects all datanode registrations from localhost
in single-node developer setup on Windows. (Chris Nauroth via suresh)
Release 2.0.3-alpha - Unreleased
INCOMPATIBLE CHANGES

20
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java
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@ -633,7 +633,9 @@ public class DatanodeManager {
// Mostly called inside an RPC, update ip and peer hostname
String hostname = dnAddress.getHostName();
String ip = dnAddress.getHostAddress();
if (hostname.equals(ip)) {
if (!isNameResolved(dnAddress)) {
// Reject registration of unresolved datanode to prevent performance
// impact of repetitive DNS lookups later.
LOG.warn("Unresolved datanode registration from " + ip);
throw new DisallowedDatanodeException(nodeReg);
}
@ -1061,6 +1063,22 @@ public class DatanodeManager {
}
return names;
}
/**
* Checks if name resolution was successful for the given address. If IP
* address and host name are the same, then it means name resolution has
* failed. As a special case, the loopback address is also considered
* acceptable. This is particularly important on Windows, where 127.0.0.1 does
* not resolve to "localhost".
*
* @param address InetAddress to check
* @return boolean true if name resolution successful or address is loopback
*/
private static boolean isNameResolved(InetAddress address) {
String hostname = address.getHostName();
String ip = address.getHostAddress();
return !hostname.equals(ip) || address.isLoopbackAddress();
}
private void setDatanodeDead(DatanodeDescriptor node) {
node.setLastUpdate(0);