ImportTsv does not check for table existence
---------------------------------------------
Key: HBASE-5741
URL: https://issues.apache.org/jira/browse/HBASE-5741
Project: HBase
Issue Type: Bug
Components: mapreduce
Affects Versions: 0.90.4
Reporter: Clint Heath
The usage statement for the "importtsv" command to hbase claims this:
"Note: if you do not use this option, then the target table must already exist
in HBase" (in reference to the "importtsv.bulk.output" command-line option)
The truth is, the table must exist no matter what, importtsv cannot and will
not create it for you.
This is the case because the createSubmittableJob method of ImportTsv does not
even attempt to check if the table exists already, much less create it:
(From org.apache.hadoop.hbase.mapreduce.ImportTsv.java)
305 HTable table = new HTable(conf, tableName);
The HTable method signature in use there assumes the table exists and runs a
meta scan on it:
(From org.apache.hadoop.hbase.client.HTable.java)
142 * Creates an object to access a HBase table.
...
151 public HTable(Configuration conf, final String tableName)
What we should do inside of createSubmittableJob is something similar to what
the "completebulkloads" command would do:
(Taken from org.apache.hadoop.hbase.mapreduce.LoadIncrementalHFiles.java)
690 boolean tableExists = this.doesTableExist(tableName);
691 if (!tableExists) this.createTable(tableName,dirPath);
Currently the docs are misleading, the table in fact must exist prior to
running importtsv. We should check if it exists rather than assume it's already
there and throw the below exception:
12/03/14 17:15:42 WARN client.HConnectionManager$HConnectionImplementation:
Encountered problems when prefetch META table:
org.apache.hadoop.hbase.TableNotFoundException: Cannot find row in .META. for
table: myTable2, row=myTable2,,99999999999999
at
org.apache.hadoop.hbase.client.MetaScanner.metaScan(MetaScanner.java:150)
...
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