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From "Edward J. Yoon" <edwardy...@apache.org>
Subject Re: Problems running Hama v0.7 on Yarn
Date Sun, 26 Jul 2015 23:55:04 GMT
Thanks for your report. I'll check!

On Sun, Jul 26, 2015 at 8:53 PM, Leonidas Fegaras <fegaras@cse.uta.edu> wrote:
> I wrote a very small Hama program to test it on a Yarn cluster running on my
> laptop to isolate the problem:
>
> final public class BSPTest extends BSP<LongWritable, Text, LongWritable,
> Text, Text> {
>
>     @Override
>     public final void bsp( BSPPeer<LongWritable, Text, LongWritable, Text,
> Text> peer)
>                   throws IOException, InterruptedException, SyncException {
>         LongWritable key = new LongWritable();
>         Text value = new Text();
>         peer.readNext(key,value);
>         peer.write(key,value);
>     }
>
>     public static void main ( String[] args ) throws Exception {
>         HamaConfiguration conf = new HamaConfiguration();
> conf.set("yarn.resourcemanager.address","localhost:8032");
>         YARNBSPJob job = new YARNBSPJob(conf);
>         job.setMemoryUsedPerTaskInMb(500);
>         job.setNumBspTask(4);
>         job.setJobName("test");
>         job.setBspClass(BSPTest.class);
>         job.setJarByClass(BSPTest.class);
>         job.setInputKeyClass(LongWritable.class);
>         job.setInputValueClass(Text.class);
>         job.setInputPath(new Path("in"));
>         job.setInputFormat(TextInputFormat.class);
> job.setPartitioner(org.apache.hama.bsp.HashPartitioner.class);
> job.set("bsp.min.split.size",Long.toString(1000));
>         job.setOutputPath(new Path("out"));
>         job.setOutputKeyClass(LongWritable.class);
>         job.setOutputValueClass(Text.class);
>         job.setOutputFormat(TextOutputFormat.class);
>         job.waitForCompletion(true);
>     }
> }
>
> where "in" is a small text file stored on HDFS. It does the file
> partitioning into 4 files but then it gives me the same error:
>
> 15/07/26 06:46:25 INFO ipc.Server: IPC Server handler 0 on 10000, call
> getTask(attempt_appattempt_1437858941768_0042_000001_0000_000004_4) from
> 127.0.0.1:54752: error: java.io.IOException:
> java.lang.ArrayIndexOutOfBoundsException: 4
> java.io.IOException: java.lang.ArrayIndexOutOfBoundsException: 4
>     at
> org.apache.hama.bsp.ApplicationMaster.getTask(ApplicationMaster.java:950)
>     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>     at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>     at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>     at java.lang.reflect.Method.invoke(Method.java:497)
>     at org.apache.hama.ipc.RPC$Server.call(RPC.java:615)
>     at org.apache.hama.ipc.Server$Handler$1.run(Server.java:1211)
>     at org.apache.hama.ipc.Server$Handler$1.run(Server.java:1207)
>     at java.security.AccessController.doPrivileged(Native Method)
>     at javax.security.auth.Subject.doAs(Subject.java:422)
>     at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1628)
>
> I get the same error even when I remove the partitioning and I use 1 task.
> Leonidas
>
>
> On 07/19/2015 06:55 PM, Edward J. Yoon wrote:
>>>
>>>      It seems that the reason is that I have 1 input block (1 split) but
>>> I
>>> use 4 tasks.
>>
>> Thanks for your report, it should be addressed.
>>
>>>     But the Application master shouldn't crash; it should have used 1
>>> task instead.
>>
>> Or, we can launch 1 task and 3 tasks without split. In this case, you
>> should distribute the input data yourself within your BSP program.
>> Graph package of 0.7.0 partitions vertices into empty tasks directly
>> using barrier sync if tasks num is greater than blocks num.
>>
>>> 2) If I use the PartitioningRunner using:
>>> job.setPartitioner(org.apache.hama.bsp.HashPartitioner.class);
>>>          job.setNumBspTask(4);
>>>          job.set("bsp.min.split.size","102");
>>>     it fails because it expects a Long key. Here is the log:
>>
>> By default, PartitioningRunner reads and re-writes key and value pairs
>> based on "bsp.input.key/value.class". I guess your input is Text file
>> and so key is automatically Long but you've set MRContainer as a input
>> key/value class. Can you provide information about job configuration?
>>
>> On Wed, Jul 15, 2015 at 4:12 PM, Leonidas Fegaras <fegaras@cse.uta.edu>
>> wrote:
>>>
>>> Hi,
>>> I am extending MRQL to support Hama v0.7 on Yarn (see
>>> https://issues.apache.org/jira/browse/MRQL-75 ).
>>> Currently, MRQL on Hama works fine on Mesos but I have problems running
>>> it
>>> on Yarn.
>>>
>>> 1) Without using the PartitioningRunner, the Yarn Application master
>>> crashes.
>>>      It seems that the reason is that I have 1 input block (1 split) but
>>> I
>>> use 4 tasks.
>>>      This may be caused by my input format.
>>>      But the Application master shouldn't crash; it should have used 1
>>> task
>>> instead.
>>>      The log is attached below.
>>>
>>> 2) If I use the PartitioningRunner using:
>>> job.setPartitioner(org.apache.hama.bsp.HashPartitioner.class);
>>>          job.setNumBspTask(4);
>>>          job.set("bsp.min.split.size","102");
>>>     it fails because it expects a Long key. Here is the log:
>>>
>>> 15/07/15 09:31:40 INFO bsp.BSPJobClient: Running job:
>>> job_localrunner_0001
>>> 15/07/15 09:31:42 INFO bsp.LocalBSPRunner: Setting up a new barrier for 4
>>> tasks!
>>> 15/07/15 09:31:42 ERROR bsp.LocalBSPRunner: Exception during BSP
>>> execution!
>>> java.io.IOException: wrong key class: org.apache.mrql.MRContainer is not
>>> class org.apache.hadoop.io.LongWritable
>>>      at
>>> org.apache.hadoop.io.SequenceFile$Writer.append(SequenceFile.java:1306)
>>>      at
>>> org.apache.hadoop.io.SequenceFile$Writer.append(SequenceFile.java:1298)
>>>      at
>>>
>>> org.apache.hama.bsp.SequenceFileRecordWriter.write(SequenceFileRecordWriter.java:47)
>>>      at
>>>
>>> org.apache.hama.bsp.SequenceFileRecordWriter.write(SequenceFileRecordWriter.java:31)
>>>      at org.apache.hama.bsp.BSPPeerImpl$1.collect(BSPPeerImpl.java:335)
>>>      at org.apache.hama.bsp.BSPPeerImpl.write(BSPPeerImpl.java:628)
>>>      at
>>> org.apache.hama.bsp.PartitioningRunner.bsp(PartitioningRunner.java:156)
>>>
>>> Thanks,
>>> Leonidas Fegaras
>>>
>>
>>
>



-- 
Best Regards, Edward J. Yoon

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