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From Jayaseelan E <jayaseela...@ericsson.com>
Subject RE: Hadoop Debugging in LocalMode (Breakpoints not reached)
Date Tue, 22 May 2012 10:38:02 GMT


________________________________
From: Björn-Elmar Macek [mailto:macek@cs.uni-kassel.de]
Sent: Tuesday, May 22, 2012 3:12 PM
To: hdfs-user@hadoop.apache.org
Subject: Hadoop Debugging in LocalMode (Breakpoints not reached)

Hi there,


i am currently trying to get rid of bugs in my Hadoop program by debugging it. Everything
went fine til some point yesterday. I dont know what exactly happened, but my program does
not stop at breakpoints within the Reducer and also not within the RawComparator for the values
which i do use for sorting my inputs in the ReducerIterator.
(see the classes set for the conf below:)

conf.setOutputValueGroupingComparator(TwitterValueGroupingComparator.class);
conf.setReducerClass(RetweetReducer.class);

The log looks like this:

Warning: $HADOOP_HOME is deprecated.
Listening for transport dt_socket at address: 5002
12/05/21 19:24:20 INFO util.NativeCodeLoader: Loaded the native-hadoop library
12/05/21 19:24:20 WARN mapred.JobClient: Use GenericOptionsParser for parsing the arguments.
Applications should implement Tool for the same.
12/05/21 19:24:20 WARN snappy.LoadSnappy: Snappy native library not loaded
12/05/21 19:24:20 INFO mapred.FileInputFormat: Total input paths to process : 2
12/05/21 19:24:20 WARN conf.Configuration: file:/tmp/hadoop-ema/mapred/local/localRunner/job_local_0001.xml:a
attempt to override final parameter: fs.default.name;  Ignoring.
12/05/21 19:24:20 WARN conf.Configuration: file:/tmp/hadoop-ema/mapred/local/localRunner/job_local_0001.xml:a
attempt to override final parameter: mapred.job.tracker;  Ignoring.
12/05/21 19:24:20 INFO mapred.JobClient: Running job: job_local_0001
12/05/21 19:24:20 INFO util.ProcessTree: setsid exited with exit code 0
12/05/21 19:24:21 INFO mapred.Task:  Using ResourceCalculatorPlugin : org.apache.hadoop.util.LinuxResourceCalculatorPlugin@1c4ff2c
12/05/21 19:24:21 INFO mapred.MapTask: numReduceTasks: 1
12/05/21 19:24:21 INFO mapred.MapTask: io.sort.mb = 100
12/05/21 19:24:22 INFO mapred.JobClient:  map 0% reduce 0%
12/05/21 19:24:22 INFO mapred.MapTask: data buffer = 79691776/99614720
12/05/21 19:24:22 INFO mapred.MapTask: record buffer = 262144/327680
12/05/21 19:24:22 INFO mapred.MapTask: Starting flush of map output
12/05/21 19:24:22 INFO mapred.MapTask: Finished spill 0
12/05/21 19:24:22 INFO mapred.Task: Task:attempt_local_0001_m_000000_0 is done. And is in
the process of commiting
12/05/21 19:24:23 INFO mapred.LocalJobRunner: file:/home/ema/INPUT-H/tweets_ext:0+968
12/05/21 19:24:23 INFO mapred.Task: Task 'attempt_local_0001_m_000000_0' done.
12/05/21 19:24:23 INFO mapred.Task:  Using ResourceCalculatorPlugin : org.apache.hadoop.util.LinuxResourceCalculatorPlugin@1e8c585
12/05/21 19:24:23 INFO mapred.MapTask: numReduceTasks: 1
12/05/21 19:24:23 INFO mapred.MapTask: io.sort.mb = 100
12/05/21 19:24:24 INFO mapred.MapTask: data buffer = 79691776/99614720
12/05/21 19:24:24 INFO mapred.MapTask: record buffer = 262144/327680
12/05/21 19:24:24 INFO mapred.MapTask: Starting flush of map output
12/05/21 19:24:24 INFO mapred.Task: Task:attempt_local_0001_m_000001_0 is done. And is in
the process of commiting
12/05/21 19:24:24 INFO mapred.JobClient:  map 100% reduce 0%
12/05/21 19:24:26 INFO mapred.LocalJobRunner: file:/home/ema/INPUT-H/tweets~:0+0
12/05/21 19:24:26 INFO mapred.Task: Task 'attempt_local_0001_m_000001_0' done.
12/05/21 19:24:26 INFO mapred.Task:  Using ResourceCalculatorPlugin : org.apache.hadoop.util.LinuxResourceCalculatorPlugin@191e4c
12/05/21 19:24:26 INFO mapred.ReduceTask: ShuffleRamManager: MemoryLimit=709551680, MaxSingleShuffleLimit=177387920
12/05/21 19:24:27 INFO mapred.ReduceTask: attempt_local_0001_r_000000_0 Need another 2 map
output(s) where 0 is already in progress
12/05/21 19:24:27 INFO mapred.ReduceTask: attempt_local_0001_r_000000_0 Thread started: Thread
for merging on-disk files
12/05/21 19:24:27 INFO mapred.ReduceTask: attempt_local_0001_r_000000_0 Thread waiting: Thread
for merging on-disk files
12/05/21 19:24:27 INFO mapred.ReduceTask: attempt_local_0001_r_000000_0 Scheduled 0 outputs
(0 slow hosts and0 dup hosts)
12/05/21 19:24:27 INFO mapred.ReduceTask: attempt_local_0001_r_000000_0 Thread started: Thread
for merging in memory files
12/05/21 19:24:27 INFO mapred.ReduceTask: attempt_local_0001_r_000000_0 Thread started: Thread
for polling Map Completion Events
12/05/21 19:24:32 INFO mapred.LocalJobRunner: reduce > copy >
12/05/21 19:24:35 INFO mapred.LocalJobRunner: reduce > copy >
12/05/21 19:24:42 INFO mapred.LocalJobRunner: reduce > copy >
12/05/21 19:24:48 INFO mapred.LocalJobRunner: reduce > copy >
12/05/21 19:24:51 INFO mapred.LocalJobRunner: reduce > copy >
12/05/21 19:24:57 INFO mapred.LocalJobRunner: reduce > copy >
... etc ...

Is there something i have missed?

Thanks for your help in advance!

Best regards,
Björn-Elmar



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