Details
Blocker Description
Observed behavior:
Against trunk, using MRv1 with hadoop 1.0.4, r1393290, I am able to run MRv1 jobs (e.g. pi 2 4).
However, when I use it to run MR over HBase jobs, they fail with the stack trace below.
From the trace, the issue seems to be that it cannot find a class that the netty jar contains. This would make sense, given that the dependency jars that we use for the MapReduce job are hard-coded, and that the netty jar is not one of them.
Strangely, this is only an issue in trunk, not 0.95, even though the code hasn't changed.
Command:
/bin/hbase org.apache.hadoop.hbase.mapreduce.RowCounter sampletable
TT logs (attached)
Output from console running job:
13/09/13 16:02:58 INFO mapred.JobClient: Task Id : attempt_201309131601_0002_m_000000_2, Status : FAILED
java.io.IOException: Cannot create a record reader because of a previous error. Please look at the previous logs lines from the task's full log for more details.
at org.apache.hadoop.hbase.mapreduce.TableInputFormatBase.createRecordReader(TableInputFormatBase.java:119)
at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.<init>(MapTask.java:489)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:731)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
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:1149)
at org.apache.hadoop.mapred.Child.main(Child.java:249)
13/09/13 16:03:09 INFO mapred.JobClient: Job complete: job_201309131601_0002
13/09/13 16:03:09 INFO mapred.JobClient: Counters: 7
13/09/13 16:03:09 INFO mapred.JobClient: Job Counters
13/09/13 16:03:09 INFO mapred.JobClient: SLOTS_MILLIS_MAPS=29913
13/09/13 16:03:09 INFO mapred.JobClient: Total time spent by all reduces waiting after reserving slots (ms)=0
13/09/13 16:03:09 INFO mapred.JobClient: Total time spent by all maps waiting after reserving slots (ms)=0
13/09/13 16:03:09 INFO mapred.JobClient: Launched map tasks=4
13/09/13 16:03:09 INFO mapred.JobClient: Data-local map tasks=4
13/09/13 16:03:09 INFO mapred.JobClient: SLOTS_MILLIS_REDUCES=0
13/09/13 16:03:09 INFO mapred.JobClient: Failed map tasks=1
Expected behavior:
As a stopgap, the netty jar should be included in that list. More generally, there should be a more elegant way to include the jars that are needed.