HBASE-15456 CreateTableProcedure/ModifyTableProcedure needs to fail when there is no family in table descriptor (huaxiang sun)

This commit is contained in:
tedyu 2016-03-15 16:15:03 -07:00
parent 51259fe4a5
commit f120602f1e
7 changed files with 98 additions and 2 deletions

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@ -31,6 +31,7 @@ import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.classification.InterfaceAudience; import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.fs.FileSystem; import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path; import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.DoNotRetryIOException;
import org.apache.hadoop.hbase.HRegionInfo; import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.HTableDescriptor; import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.MetaTableAccessor; import org.apache.hadoop.hbase.MetaTableAccessor;
@ -283,6 +284,14 @@ public class CreateTableProcedure
setFailure("master-create-table", new TableExistsException(getTableName())); setFailure("master-create-table", new TableExistsException(getTableName()));
return false; return false;
} }
// check that we have at least 1 CF
if (hTableDescriptor.getColumnFamilies().length == 0) {
setFailure("master-create-table", new DoNotRetryIOException("Table " +
getTableName().toString() + " should have at least one column family."));
return false;
}
return true; return true;
} }

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@ -29,6 +29,7 @@ import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.commons.logging.Log; import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory; import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.DoNotRetryIOException;
import org.apache.hadoop.hbase.HConstants; import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.HRegionInfo; import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.HTableDescriptor; import org.apache.hadoop.hbase.HTableDescriptor;
@ -285,6 +286,12 @@ public class ModifyTableProcedure
throw new TableNotFoundException(getTableName()); throw new TableNotFoundException(getTableName());
} }
// check that we have at least 1 CF
if (modifiedHTableDescriptor.getColumnFamilies().length == 0) {
throw new DoNotRetryIOException("Table " + getTableName().toString() +
" should have at least one column family.");
}
// In order to update the descriptor, we need to retrieve the old descriptor for comparison. // In order to update the descriptor, we need to retrieve the old descriptor for comparison.
this.unmodifiedHTableDescriptor = this.unmodifiedHTableDescriptor =
env.getMasterServices().getTableDescriptors().get(getTableName()); env.getMasterServices().getTableDescriptors().get(getTableName());

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@ -785,6 +785,13 @@ public class HRegion implements HeapSize, PropagatingConfigurationObserver, Regi
* @throws IOException e * @throws IOException e
*/ */
private long initialize(final CancelableProgressable reporter) throws IOException { private long initialize(final CancelableProgressable reporter) throws IOException {
//Refuse to open the region if there is no column family in the table
if (htableDescriptor.getColumnFamilies().length == 0) {
throw new DoNotRetryIOException("Table " + htableDescriptor.getNameAsString() +
" should have at least one column family.");
}
MonitoredTask status = TaskMonitor.get().createStatus("Initializing region " + this); MonitoredTask status = TaskMonitor.get().createStatus("Initializing region " + this);
long nextSeqId = -1; long nextSeqId = -1;
try { try {

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@ -23,10 +23,12 @@ import java.io.IOException;
import org.apache.commons.logging.Log; import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory; import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.DoNotRetryIOException;
import org.apache.hadoop.hbase.HBaseTestingUtility; import org.apache.hadoop.hbase.HBaseTestingUtility;
import org.apache.hadoop.hbase.HConstants; import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.HRegionInfo; import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.HTableDescriptor; import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.ProcedureInfo;
import org.apache.hadoop.hbase.TableExistsException; import org.apache.hadoop.hbase.TableExistsException;
import org.apache.hadoop.hbase.TableName; import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.procedure2.ProcedureExecutor; import org.apache.hadoop.hbase.procedure2.ProcedureExecutor;
@ -43,6 +45,7 @@ import org.junit.BeforeClass;
import org.junit.Test; import org.junit.Test;
import org.junit.experimental.categories.Category; import org.junit.experimental.categories.Category;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue; import static org.junit.Assert.assertTrue;
@Category({MasterTests.class, MediumTests.class}) @Category({MasterTests.class, MediumTests.class})
@ -119,6 +122,27 @@ public class TestCreateTableProcedure {
UTIL.getHBaseCluster().getMaster(), tableName, regions, "f1", "f2"); UTIL.getHBaseCluster().getMaster(), tableName, regions, "f1", "f2");
} }
@Test(timeout=60000)
public void testCreateWithoutColumnFamily() throws Exception {
final ProcedureExecutor<MasterProcedureEnv> procExec = getMasterProcedureExecutor();
final TableName tableName = TableName.valueOf("testCreateWithoutColumnFamily");
// create table with 0 families will fail
final HTableDescriptor htd = MasterProcedureTestingUtility.createHTD(tableName);
// disable sanity check
htd.setConfiguration("hbase.table.sanity.checks", Boolean.FALSE.toString());
final HRegionInfo[] regions = ModifyRegionUtils.createHRegionInfos(htd, null);
long procId =
ProcedureTestingUtility.submitAndWait(procExec,
new CreateTableProcedure(procExec.getEnvironment(), htd, regions));
final ProcedureInfo result = procExec.getResult(procId);
assertEquals(true, result.isFailed());
Throwable cause = ProcedureTestingUtility.getExceptionCause(result);
assertTrue("expected DoNotRetryIOException, got " + cause,
cause instanceof DoNotRetryIOException);
}
@Test(timeout=60000, expected=TableExistsException.class) @Test(timeout=60000, expected=TableExistsException.class)
public void testCreateExisting() throws Exception { public void testCreateExisting() throws Exception {
final TableName tableName = TableName.valueOf("testCreateExisting"); final TableName tableName = TableName.valueOf("testCreateExisting");

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@ -25,11 +25,13 @@ import static org.junit.Assert.assertTrue;
import org.apache.commons.logging.Log; import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory; import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.DoNotRetryIOException;
import org.apache.hadoop.hbase.HBaseTestingUtility; import org.apache.hadoop.hbase.HBaseTestingUtility;
import org.apache.hadoop.hbase.HColumnDescriptor; import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HConstants; import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.HRegionInfo; import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.HTableDescriptor; import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.ProcedureInfo;
import org.apache.hadoop.hbase.TableName; import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.procedure2.ProcedureExecutor; import org.apache.hadoop.hbase.procedure2.ProcedureExecutor;
import org.apache.hadoop.hbase.procedure2.ProcedureTestingUtility; import org.apache.hadoop.hbase.procedure2.ProcedureTestingUtility;
@ -168,12 +170,13 @@ public class TestModifyTableProcedure {
@Test(timeout = 60000) @Test(timeout = 60000)
public void testModifyTableDeleteCF() throws Exception { public void testModifyTableDeleteCF() throws Exception {
final TableName tableName = TableName.valueOf("testModifyTableAddCF"); final TableName tableName = TableName.valueOf("testModifyTableDeleteCF");
final String cf1 = "cf1";
final String cf2 = "cf2"; final String cf2 = "cf2";
final String cf3 = "cf3"; final String cf3 = "cf3";
final ProcedureExecutor<MasterProcedureEnv> procExec = getMasterProcedureExecutor(); final ProcedureExecutor<MasterProcedureEnv> procExec = getMasterProcedureExecutor();
MasterProcedureTestingUtility.createTable(procExec, tableName, null, "cf1", cf2, cf3); MasterProcedureTestingUtility.createTable(procExec, tableName, null, cf1, cf2, cf3);
HTableDescriptor currentHtd = UTIL.getHBaseAdmin().getTableDescriptor(tableName); HTableDescriptor currentHtd = UTIL.getHBaseAdmin().getTableDescriptor(tableName);
assertEquals(3, currentHtd.getFamiliesKeys().size()); assertEquals(3, currentHtd.getFamiliesKeys().size());
@ -196,6 +199,8 @@ public class TestModifyTableProcedure {
HTableDescriptor htd2 = HTableDescriptor htd2 =
new HTableDescriptor(UTIL.getHBaseAdmin().getTableDescriptor(tableName)); new HTableDescriptor(UTIL.getHBaseAdmin().getTableDescriptor(tableName));
htd2.removeFamily(cf3.getBytes()); htd2.removeFamily(cf3.getBytes());
// Disable Sanity check
htd2.setConfiguration("hbase.table.sanity.checks", Boolean.FALSE.toString());
long procId2 = long procId2 =
ProcedureTestingUtility.submitAndWait(procExec, ProcedureTestingUtility.submitAndWait(procExec,
@ -205,6 +210,21 @@ public class TestModifyTableProcedure {
currentHtd = UTIL.getHBaseAdmin().getTableDescriptor(tableName); currentHtd = UTIL.getHBaseAdmin().getTableDescriptor(tableName);
assertEquals(1, currentHtd.getFamiliesKeys().size()); assertEquals(1, currentHtd.getFamiliesKeys().size());
assertFalse(currentHtd.hasFamily(cf3.getBytes())); assertFalse(currentHtd.hasFamily(cf3.getBytes()));
//Removing the last family will fail
HTableDescriptor htd3 =
new HTableDescriptor(UTIL.getHBaseAdmin().getTableDescriptor(tableName));
htd3.removeFamily(cf1.getBytes());
long procId3 =
ProcedureTestingUtility.submitAndWait(procExec,
new ModifyTableProcedure(procExec.getEnvironment(), htd3));
final ProcedureInfo result = procExec.getResult(procId3);
assertEquals(true, result.isFailed());
Throwable cause = ProcedureTestingUtility.getExceptionCause(result);
assertTrue("expected DoNotRetryIOException, got " + cause,
cause instanceof DoNotRetryIOException);
assertEquals(1, currentHtd.getFamiliesKeys().size());
assertTrue(currentHtd.hasFamily(cf1.getBytes()));
} }
@Test(timeout=60000) @Test(timeout=60000)

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@ -148,12 +148,17 @@ public class TestNamespaceAuditor {
ADMIN.createNamespace(nspDesc); ADMIN.createNamespace(nspDesc);
assertNotNull("Namespace descriptor found null.", ADMIN.getNamespaceDescriptor(nsp)); assertNotNull("Namespace descriptor found null.", ADMIN.getNamespaceDescriptor(nsp));
assertEquals(ADMIN.listNamespaceDescriptors().length, 3); assertEquals(ADMIN.listNamespaceDescriptors().length, 3);
HColumnDescriptor fam1 = new HColumnDescriptor("fam1");
HTableDescriptor tableDescOne = HTableDescriptor tableDescOne =
new HTableDescriptor(TableName.valueOf(nsp + TableName.NAMESPACE_DELIM + "table1")); new HTableDescriptor(TableName.valueOf(nsp + TableName.NAMESPACE_DELIM + "table1"));
tableDescOne.addFamily(fam1);
HTableDescriptor tableDescTwo = HTableDescriptor tableDescTwo =
new HTableDescriptor(TableName.valueOf(nsp + TableName.NAMESPACE_DELIM + "table2")); new HTableDescriptor(TableName.valueOf(nsp + TableName.NAMESPACE_DELIM + "table2"));
tableDescTwo.addFamily(fam1);
HTableDescriptor tableDescThree = HTableDescriptor tableDescThree =
new HTableDescriptor(TableName.valueOf(nsp + TableName.NAMESPACE_DELIM + "table3")); new HTableDescriptor(TableName.valueOf(nsp + TableName.NAMESPACE_DELIM + "table3"));
tableDescThree.addFamily(fam1);
ADMIN.createTable(tableDescOne); ADMIN.createTable(tableDescOne);
boolean constraintViolated = false; boolean constraintViolated = false;
try { try {
@ -252,10 +257,13 @@ public class TestNamespaceAuditor {
assertNotNull("Namespace descriptor found null.", ADMIN.getNamespaceDescriptor(namespace)); assertNotNull("Namespace descriptor found null.", ADMIN.getNamespaceDescriptor(namespace));
NamespaceTableAndRegionInfo stateInfo = getNamespaceState(nspDesc.getName()); NamespaceTableAndRegionInfo stateInfo = getNamespaceState(nspDesc.getName());
assertNotNull("Namespace state found null for " + namespace, stateInfo); assertNotNull("Namespace state found null for " + namespace, stateInfo);
HColumnDescriptor fam1 = new HColumnDescriptor("fam1");
HTableDescriptor tableDescOne = HTableDescriptor tableDescOne =
new HTableDescriptor(TableName.valueOf(namespace + TableName.NAMESPACE_DELIM + "table1")); new HTableDescriptor(TableName.valueOf(namespace + TableName.NAMESPACE_DELIM + "table1"));
tableDescOne.addFamily(fam1);
HTableDescriptor tableDescTwo = HTableDescriptor tableDescTwo =
new HTableDescriptor(TableName.valueOf(namespace + TableName.NAMESPACE_DELIM + "table2")); new HTableDescriptor(TableName.valueOf(namespace + TableName.NAMESPACE_DELIM + "table2"));
tableDescTwo.addFamily(fam1);
ADMIN.createTable(tableDescOne); ADMIN.createTable(tableDescOne);
ADMIN.createTable(tableDescTwo, Bytes.toBytes("AAA"), Bytes.toBytes("ZZZ"), 5); ADMIN.createTable(tableDescTwo, Bytes.toBytes("AAA"), Bytes.toBytes("ZZZ"), 5);
stateInfo = getNamespaceState(nspDesc.getName()); stateInfo = getNamespaceState(nspDesc.getName());
@ -598,9 +606,13 @@ public class TestNamespaceAuditor {
TableName tableOne = TableName.valueOf(nsp1 + TableName.NAMESPACE_DELIM + "table1"); TableName tableOne = TableName.valueOf(nsp1 + TableName.NAMESPACE_DELIM + "table1");
TableName tableTwo = TableName.valueOf(nsp1 + TableName.NAMESPACE_DELIM + "table2"); TableName tableTwo = TableName.valueOf(nsp1 + TableName.NAMESPACE_DELIM + "table2");
TableName tableThree = TableName.valueOf(nsp1 + TableName.NAMESPACE_DELIM + "table3"); TableName tableThree = TableName.valueOf(nsp1 + TableName.NAMESPACE_DELIM + "table3");
HColumnDescriptor fam1 = new HColumnDescriptor("fam1");
HTableDescriptor tableDescOne = new HTableDescriptor(tableOne); HTableDescriptor tableDescOne = new HTableDescriptor(tableOne);
tableDescOne.addFamily(fam1);
HTableDescriptor tableDescTwo = new HTableDescriptor(tableTwo); HTableDescriptor tableDescTwo = new HTableDescriptor(tableTwo);
tableDescTwo.addFamily(fam1);
HTableDescriptor tableDescThree = new HTableDescriptor(tableThree); HTableDescriptor tableDescThree = new HTableDescriptor(tableThree);
tableDescThree.addFamily(fam1);
ADMIN.createTable(tableDescOne, Bytes.toBytes("1"), Bytes.toBytes("1000"), 3); ADMIN.createTable(tableDescOne, Bytes.toBytes("1"), Bytes.toBytes("1000"), 3);
ADMIN.createTable(tableDescTwo, Bytes.toBytes("1"), Bytes.toBytes("1000"), 3); ADMIN.createTable(tableDescTwo, Bytes.toBytes("1"), Bytes.toBytes("1000"), 3);
ADMIN.createTable(tableDescThree, Bytes.toBytes("1"), Bytes.toBytes("1000"), 4); ADMIN.createTable(tableDescThree, Bytes.toBytes("1"), Bytes.toBytes("1000"), 4);
@ -690,10 +702,13 @@ public class TestNamespaceAuditor {
ADMIN.createNamespace(nspDesc); ADMIN.createNamespace(nspDesc);
assertNotNull("Namespace descriptor found null.", ADMIN.getNamespaceDescriptor(nsp)); assertNotNull("Namespace descriptor found null.", ADMIN.getNamespaceDescriptor(nsp));
assertEquals(ADMIN.listNamespaceDescriptors().length, 3); assertEquals(ADMIN.listNamespaceDescriptors().length, 3);
HColumnDescriptor fam1 = new HColumnDescriptor("fam1");
HTableDescriptor tableDescOne = HTableDescriptor tableDescOne =
new HTableDescriptor(TableName.valueOf(nsp + TableName.NAMESPACE_DELIM + "table1")); new HTableDescriptor(TableName.valueOf(nsp + TableName.NAMESPACE_DELIM + "table1"));
tableDescOne.addFamily(fam1);
HTableDescriptor tableDescTwo = HTableDescriptor tableDescTwo =
new HTableDescriptor(TableName.valueOf(nsp + TableName.NAMESPACE_DELIM + "table2")); new HTableDescriptor(TableName.valueOf(nsp + TableName.NAMESPACE_DELIM + "table2"));
tableDescTwo.addFamily(fam1);
ADMIN.createTable(tableDescOne); ADMIN.createTable(tableDescOne);
ADMIN.createTable(tableDescTwo, Bytes.toBytes("AAA"), Bytes.toBytes("ZZZ"), 4); ADMIN.createTable(tableDescTwo, Bytes.toBytes("AAA"), Bytes.toBytes("ZZZ"), 4);
} }
@ -708,7 +723,9 @@ public class TestNamespaceAuditor {
assertNotNull("Namespace descriptor found null.", ADMIN.getNamespaceDescriptor(nsp)); assertNotNull("Namespace descriptor found null.", ADMIN.getNamespaceDescriptor(nsp));
TableName tableName = TableName.valueOf(nsp + TableName.NAMESPACE_DELIM + "table1"); TableName tableName = TableName.valueOf(nsp + TableName.NAMESPACE_DELIM + "table1");
TableName cloneTableName = TableName.valueOf(nsp + TableName.NAMESPACE_DELIM + "table2"); TableName cloneTableName = TableName.valueOf(nsp + TableName.NAMESPACE_DELIM + "table2");
HColumnDescriptor fam1 = new HColumnDescriptor("fam1");
HTableDescriptor tableDescOne = new HTableDescriptor(tableName); HTableDescriptor tableDescOne = new HTableDescriptor(tableName);
tableDescOne.addFamily(fam1);
ADMIN.createTable(tableDescOne); ADMIN.createTable(tableDescOne);
String snapshot = "snapshot_testTableQuotaExceedWithCloneSnapshot"; String snapshot = "snapshot_testTableQuotaExceedWithCloneSnapshot";
ADMIN.snapshot(snapshot, tableName); ADMIN.snapshot(snapshot, tableName);
@ -726,7 +743,10 @@ public class TestNamespaceAuditor {
assertNotNull("Namespace descriptor found null.", ADMIN.getNamespaceDescriptor(nsp)); assertNotNull("Namespace descriptor found null.", ADMIN.getNamespaceDescriptor(nsp));
TableName tableName = TableName.valueOf(nsp + TableName.NAMESPACE_DELIM + "table1"); TableName tableName = TableName.valueOf(nsp + TableName.NAMESPACE_DELIM + "table1");
TableName cloneTableName = TableName.valueOf(nsp + TableName.NAMESPACE_DELIM + "table2"); TableName cloneTableName = TableName.valueOf(nsp + TableName.NAMESPACE_DELIM + "table2");
HColumnDescriptor fam1 = new HColumnDescriptor("fam1");
HTableDescriptor tableDescOne = new HTableDescriptor(tableName); HTableDescriptor tableDescOne = new HTableDescriptor(tableName);
tableDescOne.addFamily(fam1);
ADMIN.createTable(tableDescOne, Bytes.toBytes("AAA"), Bytes.toBytes("ZZZ"), 4); ADMIN.createTable(tableDescOne, Bytes.toBytes("AAA"), Bytes.toBytes("ZZZ"), 4);
String snapshot = "snapshot_testCloneSnapshot"; String snapshot = "snapshot_testCloneSnapshot";
@ -761,6 +781,8 @@ public class TestNamespaceAuditor {
assertNotNull("Namespace descriptor found null.", ADMIN.getNamespaceDescriptor(nsp)); assertNotNull("Namespace descriptor found null.", ADMIN.getNamespaceDescriptor(nsp));
TableName tableName1 = TableName.valueOf(nsp + TableName.NAMESPACE_DELIM + "table1"); TableName tableName1 = TableName.valueOf(nsp + TableName.NAMESPACE_DELIM + "table1");
HTableDescriptor tableDescOne = new HTableDescriptor(tableName1); HTableDescriptor tableDescOne = new HTableDescriptor(tableName1);
HColumnDescriptor fam1 = new HColumnDescriptor("fam1");
tableDescOne.addFamily(fam1);
ADMIN.createTable(tableDescOne, Bytes.toBytes("AAA"), Bytes.toBytes("ZZZ"), 4); ADMIN.createTable(tableDescOne, Bytes.toBytes("AAA"), Bytes.toBytes("ZZZ"), 4);
NamespaceTableAndRegionInfo nstate = getNamespaceState(nsp); NamespaceTableAndRegionInfo nstate = getNamespaceState(nsp);
@ -796,6 +818,9 @@ public class TestNamespaceAuditor {
assertNotNull("Namespace descriptor found null.", ndesc); assertNotNull("Namespace descriptor found null.", ndesc);
TableName tableName1 = TableName.valueOf(nsp + TableName.NAMESPACE_DELIM + "table1"); TableName tableName1 = TableName.valueOf(nsp + TableName.NAMESPACE_DELIM + "table1");
HTableDescriptor tableDescOne = new HTableDescriptor(tableName1); HTableDescriptor tableDescOne = new HTableDescriptor(tableName1);
HColumnDescriptor fam1 = new HColumnDescriptor("fam1");
tableDescOne.addFamily(fam1);
ADMIN.createTable(tableDescOne, Bytes.toBytes("AAA"), Bytes.toBytes("ZZZ"), 4); ADMIN.createTable(tableDescOne, Bytes.toBytes("AAA"), Bytes.toBytes("ZZZ"), 4);
NamespaceTableAndRegionInfo nstate = getNamespaceState(nsp); NamespaceTableAndRegionInfo nstate = getNamespaceState(nsp);

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@ -35,6 +35,7 @@ import org.apache.hadoop.hbase.client.Admin;
import org.apache.hadoop.hbase.regionserver.HRegionServer; import org.apache.hadoop.hbase.regionserver.HRegionServer;
import org.apache.hadoop.hbase.testclassification.MediumTests; import org.apache.hadoop.hbase.testclassification.MediumTests;
import org.apache.hadoop.hbase.util.RegionMover.RegionMoverBuilder; import org.apache.hadoop.hbase.util.RegionMover.RegionMoverBuilder;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.junit.AfterClass; import org.junit.AfterClass;
import org.junit.Before; import org.junit.Before;
import org.junit.BeforeClass; import org.junit.BeforeClass;
@ -70,6 +71,9 @@ public class TestRegionMover {
TEST_UTIL.deleteTable(tableName); TEST_UTIL.deleteTable(tableName);
} }
HTableDescriptor tableDesc = new HTableDescriptor(tableName); HTableDescriptor tableDesc = new HTableDescriptor(tableName);
HColumnDescriptor fam1 = new HColumnDescriptor("fam1");
tableDesc.addFamily(fam1);
try { try {
admin.setBalancerRunning(false, true); admin.setBalancerRunning(false, true);
String startKey = "a"; String startKey = "a";