This is Hadoop 2.0, but using the separate MR1 package
(hadoop-2.0.0-mr1-cdh4.1.3), not yarn. I formatted the namenode ("./bin/hadoop
namenode -format") and saw no errors in the shell or in the logs/[namenode].log
file (in fact, simply formatting the namenode doesn't even create the log file
yet). I believe that merely formatting the namenode shouldn't leave any
persistent java processes running, so I wouldn't expect "ps aux | grep java" to
show anything, which of course it doesn't.
I then started the namenode with "./bin/hadoop-daemon.sh start namenode". This
produces the log file and still shows no errors. The final entry in the log is:
2013-02-19 19:15:19,477 INFO org.apache.hadoop.ipc.Server: Starting Socket
Reader #1 for port 9000
Curiously, I still don't see any java processes running and netstat doesn't
show any obvious 9000 listeners. I get this:
$ netstat -a -t --numeric-ports -p
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address
State PID/Program name
tcp 0 0 localhost:25 *:*
LISTEN -
tcp 0 0 *:22 *:*
LISTEN -
tcp 0 0 ip-13-0-177-11:60765 ec2-50-19-38-112.compute:22
ESTABLISHED 23591/ssh
tcp 0 0 ip-13-0-177-11:22 13.0.177.165:56984
ESTABLISHED -
tcp 0 0 ip-13-0-177-11:22 13.0.177.165:38081
ESTABLISHED -
tcp 0 0 *:22 *:*
LISTEN -
Note that ip-13-0-177-11 is the current machine (it is also specified as the
master in /etc/hosts and is indicated via localhost in fs.default.name on port
9000 (fs.default.name = "hdfs://localhost:9000")). So, at this point, I'm
beginning to get confused because I don't see a java namenode process and I
don't see a port 9000 listener...but still haven't seen any blatant error
messages.
Next, I try "hadoop fs -ls /". I then get the shell error I have been
wrestling with recently:
ls: Call From ip-13-0-177-11/127.0.0.1 to localhost:9000 failed on connection
exception: java.net.ConnectException: Connection refused; For more details see:
http://wiki.apache.org/hadoop/ConnectionRefused
Furthermore, this last step adds the following entry to the namenode log file:
2013-02-19 19:15:20,434 WARN
org.apache.hadoop.hdfs.server.blockmanagement.BlockManager: ReplicationMonitor
thread received InterruptedException.
java.lang.InterruptedException: sleep interrupted
at java.lang.Thread.sleep(Native Method)
at
org.apache.hadoop.hdfs.server.blockmanagement.BlockManager$ReplicationMonitor.run(BlockManager.java:3025)
at java.lang.Thread.run(Thread.java:679)
2013-02-19 19:15:20,438 WARN
org.apache.hadoop.hdfs.server.blockmanagement.DecommissionManager: Monitor
interrupted: java.lang.InterruptedException: sleep interrupted
2013-02-19 19:15:20,442 INFO
org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Stopping services started
for active state
2013-02-19 19:15:20,442 INFO
org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Stopping services started
for standby state
2013-02-19 19:15:20,442 INFO org.apache.hadoop.ipc.Server: Stopping server on
9000
2013-02-19 19:15:20,444 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl:
Stopping NameNode metrics system...
2013-02-19 19:15:20,444 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl:
NameNode metrics system stopped.
2013-02-19 19:15:20,445 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl:
NameNode metrics system shutdown complete.
2013-02-19 19:15:20,445 FATAL org.apache.hadoop.hdfs.server.namenode.NameNode:
Exception in namenode join
java.io.FileNotFoundException: webapps/hdfs not found in CLASSPATH
at org.apache.hadoop.http.HttpServer.getWebAppsPath(HttpServer.java:560)
at org.apache.hadoop.http.HttpServer.<init>(HttpServer.java:247)
at org.apache.hadoop.http.HttpServer.<init>(HttpServer.java:171)
at
org.apache.hadoop.hdfs.server.namenode.NameNodeHttpServer$1.<init>(NameNodeHttpServer.java:89)
at
org.apache.hadoop.hdfs.server.namenode.NameNodeHttpServer.start(NameNodeHttpServer.java:87)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.startHttpServer(NameNode.java:547)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.startCommonServices(NameNode.java:480)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:443)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:608)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:589)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1140)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1204)
2013-02-19 19:15:20,447 INFO org.apache.hadoop.util.ExitUtil: Exiting with
status 1
2013-02-19 19:15:20,474 INFO org.apache.hadoop.hdfs.server.namenode.NameNode:
SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at ip-13-0-177-11/127.0.0.1
************************************************************/
This is particularly confusing because, while the hadoop-2.0.0-mr1-cdh4.1.3/
dir does have a webapps/ dir, there is no "hdfs" file or dir in that webapps/.
It contains job/, static/, and task/.
If I start over from a freshly formatted namenode and take a slightly different
approach -- if I try to start the datanode immediately after starting the
namenode -- once again it fails, and in a very similar way. This time the
command to start the datanode has two effects: the namenode log still can't
find webapps/hdfs, just as shown above, and also, there is now a datanode log
file, and it likewise can't find webapps/datanode
("java.io.FileNotFoundException: webapps/datanode not found in CLASSPATH") so I
get two very similar errors at once, one on the namenode and one on the
datanode.
This webapps/ dir business makes no sense since the files (or directories) the
logs claim to be looking for inside webapps/ ("hdfs" and "datanode") don't
exist!
Thoughts?
________________________________________________________________________________
Keith Wiley [email protected] keithwiley.com music.keithwiley.com
"It's a fine line between meticulous and obsessive-compulsive and a slippery
rope between obsessive-compulsive and debilitatingly slow."
-- Keith Wiley
________________________________________________________________________________
