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From "Haijun Cao (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1634) UI and shell list throw NPE
Date Tue, 14 Jul 2009 06:17:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1634?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12730710#action_12730710
] 

Haijun Cao commented on HBASE-1634:
-----------------------------------

Stack, 

For 1638, here is how I get it:

setup:

hadoop-0.20.0 (distributed mode, 1 regionserver)
hbase trunk (distributed mode, 1 datanode)
zookeeper-3.2.0 (standalone mode)

everything run in one machine (linux ubuntu).

reproduce steps:

use PE program (nomapred) to populate TestTable with 10million records (10 client threads,
took 30 min, not bad).

run PE as MapReduce program to sequetialWrite 2million records, the map reduce program started,
then hbase crashed, the crash stack is pasted in the previous comment, here is the exact m/r
command:

bin/hadoop jar hbase-dev-test.jar --rows=1000000 sequentialWrite 2

here is the input.txt generated by the above PE M/R program:

bin/hadoop dfs -cat /user/bamboo/performance_evaluation/20090713163827/input.txt
startRow=1100000, perClientRunRows=100000, totalRows=2000000, clients=2
startRow=1400000, perClientRunRows=100000, totalRows=2000000, clients=2
startRow=800000, perClientRunRows=100000, totalRows=2000000, clients=2
startRow=700000, perClientRunRows=100000, totalRows=2000000, clients=2
startRow=400000, perClientRunRows=100000, totalRows=2000000, clients=2
startRow=1900000, perClientRunRows=100000, totalRows=2000000, clients=2
startRow=1000000, perClientRunRows=100000, totalRows=2000000, clients=2
startRow=1500000, perClientRunRows=100000, totalRows=2000000, clients=2
startRow=300000, perClientRunRows=100000, totalRows=2000000, clients=2
startRow=1700000, perClientRunRows=100000, totalRows=2000000, clients=2
startRow=600000, perClientRunRows=100000, totalRows=2000000, clients=2
startRow=1800000, perClientRunRows=100000, totalRows=2000000, clients=2
startRow=1300000, perClientRunRows=100000, totalRows=2000000, clients=2
startRow=1600000, perClientRunRows=100000, totalRows=2000000, clients=2
startRow=0, perClientRunRows=100000, totalRows=2000000, clients=2
startRow=100000, perClientRunRows=100000, totalRows=2000000, clients=2
startRow=500000, perClientRunRows=100000, totalRows=2000000, clients=2
startRow=200000, perClientRunRows=100000, totalRows=2000000, clients=2
startRow=900000, perClientRunRows=100000, totalRows=2000000, clients=2
startRow=1200000, perClientRunRows=100000, totalRows=2000000, clients=2









> UI and shell list throw NPE
> ---------------------------
>
>                 Key: HBASE-1634
>                 URL: https://issues.apache.org/jira/browse/HBASE-1634
>             Project: Hadoop HBase
>          Issue Type: Bug
>            Reporter: stack
>             Fix For: 0.20.0
>
>
> I have a .META. from bryan duxbury that has a row with only historian data.  List does
whole row, not just info, so if only historian entries, a row is returned.  We then try and
get a regioninfo from this row and NPE.
> As to why this happens, jd suggests that since we moved to async historian updates, row
may have been deleted already.  Confirm.

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