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From "Azza Abouzeid (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-2615) M/R on bulk imported tables
Date Wed, 26 May 2010 16:40:40 GMT
M/R on bulk imported tables
---------------------------

                 Key: HBASE-2615
                 URL: https://issues.apache.org/jira/browse/HBASE-2615
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.20.4, 0.20.3
         Environment: os.arch=amd64; os.version=2.6.9-67.ELsmp; java.version=1.6.0_15; java.vendor=Sun
Microsystems Inc.

            Reporter: Azza Abouzeid


We are bulk importing using loadtable.rb and running M/R jobs using HBase as input.

We're taking the following steps:
1a. Load HBase with a M/R job using the normal API. 
OR
1b. Load HBase with bulk import.

THEN

2a. Using the shell, do a "count" over the table.
OR
2b. Run a M/R job that scans the whole HBase table (and nothing else).

Of the 4 combos, 3 are fine: 1a+2a, 1a+2b, 1b+2a.  We're having trouble with 1b+2b.  When
we run the M/R job, it doesn't seem to read in any records, but there are no explicit errors
in either the Hadoop or HBase logs.

Any ideas on what might be wrong with the bulk import to cause this problem?  We confirmed
this problem exists in both hbase-0.20.3 and hbase-0.20.4.

We have created dummy data for you test the issue. This is the test case:

After loading the data into HDFS. In hbase shell:
create 'tiny', 'values'

Execute: 
{HBASE-HOME}/bin/hbase org.jruby.Main {HBASE-HOME}/bin/loadtable.rb tiny tinytable

Then run the simple row counter
{HADOOP-HOME}/bin/hadoop jar {HBASE-HOME}/hbase-0.20.x.jar rowcounter tiny values

Notice that map input records read is always zero. We confirmed that other mapreduce jobs
do not execute the map function at all, always returning 0 records.

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