[jira] [Created] (HBASE-11100) IntegrationTestTableSnapshotInputFormat fails due to empty regions

["Vandana Ayyalasomayajula (JIRA)" <ji...@apache.org>]

Vandana Ayyalasomayajula created HBASE-11100:
------------------------------------------------

             Summary: IntegrationTestTableSnapshotInputFormat fails due to empty regions
                 Key: HBASE-11100
                 URL: https://issues.apache.org/jira/browse/HBASE-11100
             Project: HBase
          Issue Type: Bug
          Components: snapshots
    Affects Versions: 0.98.1
            Reporter: Vandana Ayyalasomayajula
            Assignee: Vandana Ayyalasomayajula
            Priority: Minor


When IntegrationTestTableSnapshotInputFormat is ran on real cluster with command
{code}
hbase org.apache.hadoop.hbase.mapreduce.IntegrationTestTableSnapshotInputFormat
{code}
it fails with the following exception:

{code}
Exception in thread "main" java.lang.AssertionError: expected:<32> but was:<30>
	at org.junit.Assert.fail(Assert.java:88)
	at org.junit.Assert.failNotEquals(Assert.java:743)
	at org.junit.Assert.assertEquals(Assert.java:118)
	at org.junit.Assert.assertEquals(Assert.java:555)
	at org.junit.Assert.assertEquals(Assert.java:542)
	at org.apache.hadoop.hbase.snapshot.SnapshotTestingUtils.confirmSnapshotValid(SnapshotTestingUtils.java:244)
	at org.apache.hadoop.hbase.snapshot.SnapshotTestingUtils.createSnapshotAndValidate(SnapshotTestingUtils.java:399)
	at org.apache.hadoop.hbase.mapreduce.TestTableSnapshotInputFormat.createTableAndSnapshot(TestTableSnapshotInputFormat.java:193)
	at org.apache.hadoop.hbase.mapreduce.TestTableSnapshotInputFormat.doTestWithMapReduce(TestTableSnapshotInputFormat.java:363)
	at org.apache.hadoop.hbase.mapreduce.IntegrationTestTableSnapshotInputFormat.runTestFromCommandLine(IntegrationTestTableSnapshotInputFormat.java:132)
	at org.apache.hadoop.hbase.IntegrationTestBase.doWork(IntegrationTestBase.java:79)
	at org.apache.hadoop.hbase.util.AbstractHBaseTool.run(AbstractHBaseTool.java:112)
	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
	at org.apache.hadoop.hbase.mapreduce.IntegrationTestTableSnapshotInputFormat.main(IntegrationTestTableSnapshotInputFormat.java:151)

{code}

However when we specify less number of regions, say 6 like 
{code}
hbase org.apache.hadoop.hbase.mapreduce.IntegrationTestTableSnapshotInputFormat -DIntegrationTestTableSnapshotInputFormat.numRegions=6
{code}
the test passes.

The integration test internally uses HBaseTestingUtility's loadtable API to create and load data into the regions. But that API does not seem to generate enough data for 32 regions ( which is the default number of regions in the integration test).  As a result some regions end up with no keys.  When the SnapshotTestingUtils calls confirmSnapshotValid method to verify the snaphot process, it looks for store files. When some region are empty they are not counted and hence the test fails. 




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