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From "Buttler, David" <buttl...@llnl.gov>
Subject NPE in TableInputFormatBase$TableRecordReader.restart() (line 110)
Date Tue, 12 Jan 2010 21:05:12 GMT
Hi All,
I am trying to set up a map-reduce job over my hbase installation and I am running into an
error that puzzles me:
MapAttempt TASK_TYPE="MAP" TASKID="task_201001061749_0006_m_000004" TASK_ATTEMPT_ID="attempt_201001061749_0006_m_000004_2"
TASK_STATUS="FAILED" FINISH_TIME="1263318756976" HOSTNAME="compute-0-9\.local" ERROR="java\.lang\.NullPointerException
        at org\.apache\.hadoop\.hbase\.mapreduce\.TableInputFormatBase$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

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