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From Samir Kumar Das Mohapatra <dasmo...@adobe.com>
Subject RE: error while running reduce
Date Mon, 11 Mar 2013 11:31:13 GMT
<property>
  <name>mapred.reduce.child.java.opts</name>
  <value>-Xmx1024M</value>
</property>

Above parameter you have to increase the memory. Bcz it is showing only 1GB , Again VM will
 comsume more memory as compared with real physical system.

Just try to increase the VM Memory first. Then increase the reduce memory.



From: Arindam Choudhury [mailto:arindamchoudhury0@gmail.com]
Sent: 07 March 2013 18:01
To: user@hadoop.apache.org
Subject: error while running reduce

Hi,
I am trying to do a performance analysis of hadoop on virtual machine. When I try to run terasort
with 2GB of input data with 1 map and 1 reduce, the map finishes properly, but reduce gives
error. I can not understand why? any help?

I have a single node hadoop deployment in a virtual machine. The F18 virtual machine have
1 core and 2 GB of memory.
my configuration:
core-site.xml
<configuration>
<property>
  <name>fs.default.name<http://fs.default.name></name>
  <value>hdfs://hadoopa.arindam.com:54310<http://hadoopa.arindam.com:54310></value>
</property>
<property>
  <name>hadoop.tmp.dir</name>
  <value>/tmp/${user.name<http://user.name>}</value>
</property>
<property>
  <name>fs.inmemory.size.mb</name>
  <value>20</value>
</property>
<property>
  <name>io.file.buffer.size</name>
  <value>131072</value>
</property>
</configuration>

hdfs-site.xml
<configuration>
<property>
  <name>dfs.name.dir</name>
  <value>/home/hadoop/hadoop-dir/name-dir</value>
</property>
<property>
  <name>dfs.data.dir</name>
  <value>/home/hadoop/hadoop-dir/data-dir</value>
</property>
<property>
  <name>dfs.block.size</name>
  <value>2048000000<tel:2048000000></value>
  <final>true</final>
</property>
<property>
  <name>dfs.replication</name>
  <value>1</value>
</property>
</configuration>


mapred-site.xml
<configuration>
<property>
  <name>mapred.job.tracker</name>
  <value>hadoopa.arindam.com:54311<http://hadoopa.arindam.com:54311></value>
</property>
<property>
  <name>mapred.system.dir</name>
  <value>/home/hadoop/hadoop-dir/system-dir</value>
</property>
<property>
  <name>mapred.local.dir</name>
  <value>/home/hadoop/hadoop-dir/local-dir</value>
</property>
<property>
  <name>mapred.map.child.java.opts</name>
  <value>-Xmx1024M</value>
</property>
<property>
  <name>mapred.reduce.child.java.opts</name>
  <value>-Xmx1024M</value>
</property>
</configuration>
I created 2GB of data to run tera sort.

hadoop dfsadmin -report
Configured Capacity: 21606146048 (20.12 GB)
Present Capacity: 14480427242 (13.49 GB)
DFS Remaining: 12416368640 (11.56 GB)
DFS Used: 2064058602<tel:2064058602> (1.92 GB)
DFS Used%: 14.25%
Under replicated blocks: 0
Blocks with corrupt replicas: 0
Missing blocks: 0

-------------------------------------------------
Datanodes available: 1 (1 total, 0 dead)

Name: 192.168.122.32:50010<http://192.168.122.32:50010>
Decommission Status : Normal
Configured Capacity: 21606146048 (20.12 GB)
DFS Used: 2064058602<tel:2064058602> (1.92 GB)
Non DFS Used: 7125718806<tel:7125718806> (6.64 GB)
DFS Remaining: 12416368640(11.56 GB)
DFS Used%: 9.55%
DFS Remaining%: 57.47%

But when I run the terasort, i am getting the following error:

13/03/04 17:56:16 INFO mapred.JobClient: Task Id : attempt_201303041741_0002_r_000000_0, Status
: FAILED
org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/hadoop/output/_temporary/_attempt_201303041741_0002_r_000000_0/part-00000
could only be replicated to 0 nodes, instead of 1

hadoop dfsadmin -report
Configured Capacity: 21606146048 (20.12 GB)
Present Capacity: 10582014209 (9.86 GB)
DFS Remaining: 8517738496 (7.93 GB)
DFS Used: 2064275713<tel:2064275713> (1.92 GB)
DFS Used%: 19.51%
Under replicated blocks: 2
Blocks with corrupt replicas: 0
Missing blocks: 0

-------------------------------------------------
Datanodes available: 1 (1 total, 0 dead)

Name: 192.168.122.32:50010<http://192.168.122.32:50010>
Decommission Status : Normal
Configured Capacity: 21606146048 (20.12 GB)
DFS Used: 2064275713<tel:2064275713> (1.92 GB)
Non DFS Used: 11024131839 (10.27 GB)
DFS Remaining: 8517738496(7.93 GB)
DFS Used%: 9.55%
DFS Remaining%: 39.42%


Thanks,

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