Hi All,
I am trying to set up a map-reduce job over my hbase installation and I am
running into an error that puzzles me:
MapAttempt TASK_TYPE="MAP" TASKID="task_201001061749_0006_m_000004"
TASK_ATTEMPT_ID="attempt_201001061749_0006_m_000004_2" TASK_STATUS="FAILED"
FINISH_TIME="1263318756976" HOSTNAME="compute-0-9\.local"
ERROR="java\.lang\.NullPointerException
at
org\.apache\.hadoop\.hbase\.mapreduce\.TableInputFormatBase$TableRecordReader\.restart(TableInputFormatBase\.java:110)
at
org\.apache\.hadoop\.hbase\.mapreduce\.TableInputFormatBase$TableRecordReader\.init(TableInputFormatBase\.java:119)
at
org\.apache\.hadoop\.hbase\.mapreduce\.TableInputFormatBase\.createRecordReader(TableInputFormatBase\.java:262)
at org\.apache\.hadoop\.mapred\.MapTask\.runNewMapper(MapTask\.java:551)
at org\.apache\.hadoop\.mapred\.MapTask\.run(MapTask\.java:305)
at org\.apache\.hadoop\.mapred\.Child\.main(Child\.java:170)
versions:
hadoop 0.20.1
hbase 0.20.2
zookeeper 3.2.1
Looking at the hbase source code suggests that for some reason the htable field
is not being initialized. However, according to my console, I get through
approximately 26% of the map tasks and 9% of the reduce tasks before it fails
[although I am not sure how accurate that is as I don't see any changes to my
hbase table].
I get this result with both my own code an running
org.apache.hadoop.hbase.mapreduce.RowCounter
Any suggestions?
Dave
