We have a version mismatch problem which may be Hadoop related but may be due
to a third party product we are using that requires us to run Zookeeper and
Hadoop. This product is rumored to soon be an Apache incubator project. As I
am not sure what I can reveal about this third party program prior to its
release to Apache I will refer to it as XXX.
We are running Hadoop 0.20.203.0. We have no problems running Hadoop at all.
It runs our Hadoop programs and our Hadoop fs commands without any version
mismatch complaints. Localhost:50030 and 50070 both report we are running
0.20.203.0, r1099333.
But when we try to initialize XXX we get
"org.apache.hadoop.ipc.RPC$VersionMismatch: Protocol
org.apache.hadoop.hdfs.protocol.ClientProtocol version mismatch. (client = 60,
server = 61)
org.apache.hadoop.ipc.RPC$VersionMismatch: Protocol
org.apache.hadoop.hdfs.protocol.ClientProtocol version mismatch. (client = 60,
server = 61)". The developers of XXX tell me that this error is coming from
HDFS and is unrelated to their program. (XXX does not include any Hadoop or
Zookeeper jar files - as HBase does - but simply grabs these from HADOOP_HOME
which points to our 0.20.203.0 installation and ZOOKEEPER_HOME.)
1. What exactly does "client = 60" mean? Which Hadoop version is this
referring to?
2. What exactly does "server = 61" mean? Which Hadoop version is this
referring to?
3. Any ideas on whether this is a problem with my Hadoop configuration or
whether this is a problem with XXX?
17 15:20:56,564 [security.Groups] INFO : Group mapping
impl=org.apache.hadoop.security.ShellBasedUnixGroupsMapping; cacheTimeout=300000
17 15:20:56,704 [conf.Configuration] WARN : mapred.task.id is deprecated.
Instead, use mapreduce.task.attempt.id
17 15:20:56,771 [util.Initialize] FATAL:
org.apache.hadoop.ipc.RPC$VersionMismatch: Protocol
org.apache.hadoop.hdfs.protocol.ClientProtocol version mismatch. (client = 60,
server = 61)
org.apache.hadoop.ipc.RPC$VersionMismatch: Protocol
org.apache.hadoop.hdfs.protocol.ClientProtocol version mismatch. (client = 60,
server = 61)
at
org.apache.hadoop.ipc.WritableRpcEngine.getProxy(WritableRpcEngine.java:231)
at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:224)
at org.apache.hadoop.hdfs.DFSClient.createRPCNamenode(DFSClient.java:156)
at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:255)
at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:222)
at
org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:94)
at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:1734)
at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:74)
at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:1768)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1750)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:234)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:131)
Alan
