KWON BYUNGCHANG created HDFS-13138:
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Summary: webhdfs of federated namenode does not work properly
Key: HDFS-13138
URL: https://issues.apache.org/jira/browse/HDFS-13138
Project: Hadoop HDFS
Issue Type: Bug
Components: webhdfs
Affects Versions: 3.0.0, 2.7.1
Reporter: KWON BYUNGCHANG
my cluster has multiple namenodes using HDFS Federation.
webhdfs that is not defaultFS does not work properly.
when I uploaded to non defaultFS namenode using webhdfs.
uploaded file was founded at defaultFS namenode.
I think root cause is that
clientNamenodeAddress of non defaultFS namenode is always fs.defaultFS.
[https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNode.java#L462]
{code:java}
/**
* Set the namenode address that will be used by clients to access this
* namenode or name service. This needs to be called before the config
* is overriden.
*/
public void setClientNamenodeAddress(Configuration conf) {
String nnAddr = conf.get(FS_DEFAULT_NAME_KEY);
if (nnAddr == null) {
// default fs is not set.
clientNamenodeAddress = null;
return;
}
LOG.info("{} is {}", FS_DEFAULT_NAME_KEY, nnAddr);
URI nnUri = URI.create(nnAddr);
String nnHost = nnUri.getHost();
if (nnHost == null) {
clientNamenodeAddress = null;
return;
}
if (DFSUtilClient.getNameServiceIds(conf).contains(nnHost)) {
// host name is logical
clientNamenodeAddress = nnHost;
} else if (nnUri.getPort() > 0) {
// physical address with a valid port
clientNamenodeAddress = nnUri.getAuthority();
} else {
// the port is missing or 0. Figure out real bind address later.
clientNamenodeAddress = null;
return;
}
LOG.info("Clients are to use {} to access"
+ " this namenode/service.", clientNamenodeAddress );
}
{code}
so webhdfs is redirected to datanode having wrong namenoderpcaddress parameter
finally file was located namenode of fs,defaultFS
workaround is
configure fs.defaultFS of each namenode to its own nameservice.
e.g.
hdfs://ns1 has fs.defaultFS=hdfs://ns1
hdfs://ns2 has fs.defaultFS=hdfs://ns2
....
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