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HDFS-9290. DFSClient#callAppend() is not backward compatible for slightly older NameNodes. Contributed by Tony Wu. 

(cherry picked from commit b9e0417bdf)

Conflicts:
	hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java
This commit is contained in:
Kihwal Lee 2015-10-23 16:46:14 -05:00
parent 2b6ce20e1c
commit f2fd011cc1
2 changed files with 10 additions and 1 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -72,6 +72,9 @@ Release 2.7.2 - UNRELEASED
HDFS-9220. Reading small file (< 512 bytes) that is open for append fails
due to incorrect checksum (Jing Zhao via kihwal)
HDFS-9290. DFSClient#callAppend() is not backward compatible for slightly
older NameNodes. (Tony Wu via kihwal)
Release 2.7.1 - 2015-07-06
INCOMPATIBLE CHANGES

8
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java
View File

@ -1807,9 +1807,15 @@ public class DFSClient implements java.io.Closeable, RemotePeerFactory,
try {
LastBlockWithStatus blkWithStatus = namenode.append(src, clientName,
new EnumSetWritable<>(flag, CreateFlag.class));
HdfsFileStatus status = blkWithStatus.getFileStatus();
if (status == null) {
DFSClient.LOG.debug("NameNode is on an older version, request file " +
"info with additional RPC call for file: " + src);
status = getFileInfo(src);
}
return DFSOutputStream.newStreamForAppend(this, src, flag, buffersize,
progress, blkWithStatus.getLastBlock(),
blkWithStatus.getFileStatus(), dfsClientConf.createChecksum(),
status, dfsClientConf.createChecksum(),
favoredNodes);
} catch(RemoteException re) {
throw re.unwrapRemoteException(AccessControlException.class,