@Test
public void testRollback() throws IOException {
final int rowcount = TEST_UTIL.loadRegion(this.parent, CF);
assertTrue(rowcount > 0);
int parentRowCount = TEST_UTIL.countRows(this.parent);
assertEquals(rowcount, parentRowCount);
// Start transaction.
HRegion spiedRegion = spy(this.parent);
SplitTransactionImpl st = prepareGOOD_SPLIT_ROW(spiedRegion);
SplitTransactionImpl spiedUponSt = spy(st);
doNothing()
.when(spiedUponSt)
.assertReferenceFileCount(
anyInt(), eq(parent.getRegionFileSystem().getSplitsDir(st.getFirstDaughter())));
when(spiedRegion.createDaughterRegionFromSplits(spiedUponSt.getSecondDaughter()))
.thenThrow(new MockedFailedDaughterCreation());
// Run the execute. Look at what it returns.
boolean expectedException = false;
Server mockServer = Mockito.mock(Server.class);
when(mockServer.getConfiguration()).thenReturn(TEST_UTIL.getConfiguration());
try {
spiedUponSt.execute(mockServer, null);
} catch (MockedFailedDaughterCreation e) {
expectedException = true;
}
assertTrue(expectedException);
// Run rollback
assertTrue(spiedUponSt.rollback(null, null));
// Assert I can scan parent.
int parentRowCount2 = TEST_UTIL.countRows(this.parent);
assertEquals(parentRowCount, parentRowCount2);
// Assert rollback cleaned up stuff in fs
assertTrue(!this.fs.exists(HRegion.getRegionDir(this.testdir, st.getFirstDaughter())));
assertTrue(!this.fs.exists(HRegion.getRegionDir(this.testdir, st.getSecondDaughter())));
assertTrue(!this.parent.lock.writeLock().isHeldByCurrentThread());
// Now retry the split but do not throw an exception this time.
assertTrue(st.prepare());
PairOfSameType<Region> daughters = st.execute(mockServer, null);
// Count rows. daughters are already open
int daughtersRowCount = 0;
for (Region openRegion : daughters) {
try {
int count = TEST_UTIL.countRows(openRegion);
assertTrue(count > 0 && count != rowcount);
daughtersRowCount += count;
} finally {
HBaseTestingUtility.closeRegionAndWAL(openRegion);
}
}
assertEquals(rowcount, daughtersRowCount);
// Assert the write lock is no longer held on parent
assertTrue(!this.parent.lock.writeLock().isHeldByCurrentThread());
assertTrue("Rollback hooks should be called.", wasRollBackHookCalled());
}
@Test
public void testFailAfterPONR() throws IOException, KeeperException {
final int rowcount = TEST_UTIL.loadRegion(this.parent, CF);
assertTrue(rowcount > 0);
int parentRowCount = TEST_UTIL.countRows(this.parent);
assertEquals(rowcount, parentRowCount);
// Start transaction.
SplitTransactionImpl st = prepareGOOD_SPLIT_ROW();
SplitTransactionImpl spiedUponSt = spy(st);
Mockito.doThrow(new MockedFailedDaughterOpen())
.when(spiedUponSt)
.openDaughterRegion((Server) Mockito.anyObject(), (HRegion) Mockito.anyObject());
// Run the execute. Look at what it returns.
boolean expectedException = false;
Server mockServer = Mockito.mock(Server.class);
when(mockServer.getConfiguration()).thenReturn(TEST_UTIL.getConfiguration());
try {
spiedUponSt.execute(mockServer, null);
} catch (IOException e) {
if (e.getCause() != null && e.getCause() instanceof MockedFailedDaughterOpen) {
expectedException = true;
}
}
assertTrue(expectedException);
// Run rollback returns that we should restart.
assertFalse(spiedUponSt.rollback(null, null));
// Make sure that region a and region b are still in the filesystem, that
// they have not been removed; this is supposed to be the case if we go
// past point of no return.
Path tableDir = this.parent.getRegionFileSystem().getTableDir();
Path daughterADir = new Path(tableDir, spiedUponSt.getFirstDaughter().getEncodedName());
Path daughterBDir = new Path(tableDir, spiedUponSt.getSecondDaughter().getEncodedName());
assertTrue(TEST_UTIL.getTestFileSystem().exists(daughterADir));
assertTrue(TEST_UTIL.getTestFileSystem().exists(daughterBDir));
}
