[NUTCH-937] When nutch is run on hadoop > 0.20.2 (or cdh) it will not find plugins because MapReduce will not unpack plugin/ directory from the job's pack (due to MAPREDUCE-967)

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.2
• Fix Version/s: 1.4, nutchgora
• Component/s: build

Environment

hadoop 0.21 or cloudera hadoop 0.20.2+737

• Patch Info: Patch Available
• Assignee: Julien Nioche
• Reporter: Claudio Martella
• Created: 23/Nov/10 15:56
• Updated: 20/Dec/11 11:30
• Resolved: 28/Sep/11 11:18

Description

Jobs running in on hadoop 0.21 or cloudera cdh 0.20.2+737 will fail because of missing plugins (i.e.):

10/10/28 12:22:21 WARN mapred.JobClient: Use GenericOptionsParser for
parsing the arguments. Applications should implement Tool for the same.
10/10/28 12:22:22 INFO mapred.FileInputFormat: Total input paths to
process : 1
10/10/28 12:22:23 INFO mapred.JobClient: Running job: job_201010271826_0002
10/10/28 12:22:24 INFO mapred.JobClient: map 0% reduce 0%
10/10/28 12:22:39 INFO mapred.JobClient: Task Id :
attempt_201010271826_0002_m_000000_0, Status : FAILED
java.lang.RuntimeException: Error in configuring object
at
org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:93)
at
org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:64)
at
org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:379)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:317)
at org.apache.hadoop.mapred.Child$4.run(Child.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1063)
at org.apache.hadoop.mapred.Child.main(Child.java:211)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:88)
... 9 more
Caused by: java.lang.RuntimeException: Error in configuring object
at
org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:93)
at
org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:64)
at
org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117)
at org.apache.hadoop.mapred.MapRunner.configure(MapRunner.java:34)
... 14 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:88)
... 17 more
Caused by: java.lang.RuntimeException: x point
org.apache.nutch.net.URLNormalizer not found.
at org.apache.nutch.net.URLNormalizers.<init>(URLNormalizers.java:122)
at
org.apache.nutch.crawl.Injector$InjectMapper.configure(Injector.java:70)
... 22 more
10/10/28 12:22:40 INFO mapred.JobClient: Task Id :
attempt_201010271826_0002_m_000001_0, Status : FAILED
java.lang.RuntimeException: Error in configuring object
at
org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:93)
at
org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:64)
at
org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:379)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:317)
at org.apache.hadoop.mapred.Child$4.run(Child.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1063)
at org.apache.hadoop.mapred.Child.main(Child.java:211)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:88)
... 9 more
Caused by: java.lang.RuntimeException: Error in configuring object
at
org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:93)
at
org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:64)
at
org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117)
at org.apache.hadoop.mapred.MapRunner.configure(MapRunner.java:34)
... 14 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:88)
... 17 more
Caused by: java.lang.RuntimeException: x point
org.apache.nutch.net.URLNormalizer not found.
at org.apache.nutch.net.URLNormalizers.<init>(URLNormalizers.java:122)
at
org.apache.nutch.crawl.Injector$InjectMapper.configure(Injector.java:70)
... 22 more

The bug is due to MAPREDUCE-967 (part of hadoop 0.21 and cdh 0.20.2+737) which modifies the way MapReduce unpacks the job's jar. The old way was to unpack the whole of it, now only classes/ and lib/ are unpacked. This way nutch is missing the plugins/ directory.

A workaround is to force unpacking of the plugin/ directory by setting 'mapreduce.job.jar.unpack.pattern' configuration to "(?:classes/|lib/|plugins/).*"

Issue Links

• is related to: NUTCH-993 NullPointerException at FetcherOutputFormat.checkOutputSpecs