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From "ajay.gov" <agovindara...@yahoo.com>
Subject HTable.put hangs on bulk loading
Date Thu, 07 Apr 2011 02:10:09 GMT

I am doing a load test for which I need to load a table with many rows.  I
have a small java program that has a for loop and calls HTable.put.  I am
inserting a map of 2 items into a table that has one column family. The
limit of the for loop is currently 20000. However after 15876 rows the call
to Put hangs. I am using autoFlush on the HTable. Any ideas why this may

The table configuration:
DESCRIPTION                                          ENABLED                    
 {NAME => 'TABLE2', FAMILIES => [{NAME => 'TABLE2_CF true                       
 1', BLOOMFILTER => 'NONE', REPLICATION_SCOPE => '0'                            
 , COMPRESSION => 'NONE', VERSIONS => '3', TTL => '2                            
 147483647', BLOCKSIZE => '65536', IN_MEMORY => 'fal                            
 se', BLOCKCACHE => 'true'}]}

The HBase config on the client is the one in the hbase-default.xml. Some

If i use another client I am able to put items to the table. I am also able
to scan items from the table using the hbase shell.

I have attached the server configuratio
I don't see anything in the region server or master logs. I have them here.

The master server log:
2011-04-06 19:02:40,149 INFO org.apache.hadoop.hbase.master.BaseScanner:
RegionManager.rootScanner scanning meta region {server:, regionname: -ROOT-,,0.70236052, startKey: <>}
2011-04-06 19:02:40,152 INFO org.apache.hadoop.hbase.master.BaseScanner:
RegionManager.rootScanner scan of 1 row(s) of meta region {server:, regionname: -ROOT-,,0.70236052, startKey: <>} complete
2011-04-06 19:02:40,157 INFO org.apache.hadoop.hbase.master.ServerManager: 1
region servers, 0 dead, average load 42.0
2011-04-06 19:03:15,252 INFO org.apache.hadoop.hbase.master.BaseScanner:
RegionManager.metaScanner scanning meta region {server:, regionname: .META.,,1.1028785192, startKey: <>}
2011-04-06 19:03:15,265 INFO org.apache.hadoop.hbase.master.BaseScanner:
RegionManager.metaScanner scan of 40 row(s) of meta region {server:, regionname: .META.,,1.1028785192, startKey: <>}
2011-04-06 19:03:15,266 INFO org.apache.hadoop.hbase.master.BaseScanner: All
1 .META. region(s) scanned

The region server logs:
2011-04-06 19:02:21,294 DEBUG org.apache.hadoop.hbase.regionserver.HRegion:
Creating region TABLE2,,1302141740486.010a5ae704ed53f656cbddb8e489162a.
2011-04-06 19:02:21,295 INFO org.apache.hadoop.hbase.regionserver.HRegion:
Onlined TABLE2,,1302141740486.010a5ae704ed53f656cbddb8e489162a.; next

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