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HBASE-17187 DoNotRetryExceptions from coprocessors should bubble up to the application

This commit is contained in:
Enis Soztutar 2017-02-06 12:00:05 -08:00
parent 7a6518f05d
commit 4d730244a9
3 changed files with 112 additions and 12 deletions
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31
hbase-client/src/main/java/org/apache/hadoop/hbase/client/ClientScanner.java
View File

@ -21,8 +21,6 @@ import static org.apache.hadoop.hbase.client.ConnectionUtils.calcEstimatedSize;
import static org.apache.hadoop.hbase.client.ConnectionUtils.createClosestRowAfter;
import static org.apache.hadoop.hbase.client.ConnectionUtils.createClosestRowBefore;
import com.google.common.annotations.VisibleForTesting;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.util.ArrayList;
@ -55,6 +53,8 @@ import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil;
import org.apache.hadoop.hbase.shaded.protobuf.generated.MapReduceProtos;
import org.apache.hadoop.hbase.util.Bytes;
import com.google.common.annotations.VisibleForTesting;
/**
* Implements the scanner interface for the HBase client. If there are multiple regions in a table,
* this scanner will iterate through them all.
@ -395,22 +395,33 @@ public abstract class ClientScanner extends AbstractClientScanner {
}
private Result[] nextScannerWithRetries(int nbRows) throws IOException {
int retriesLeft = getRetries();
for (;;) {
try {
return nextScanner(nbRows);
} catch (DoNotRetryIOException e) {
handleScanError(e, null);
handleScanError(e, null, retriesLeft--);
}
}
}
private void handleScanError(DoNotRetryIOException e,
MutableBoolean retryAfterOutOfOrderException) throws DoNotRetryIOException {
MutableBoolean retryAfterOutOfOrderException, int retriesLeft) throws DoNotRetryIOException {
// An exception was thrown which makes any partial results that we were collecting
// invalid. The scanner will need to be reset to the beginning of a row.
clearPartialResults();
// DNRIOEs are thrown to make us break out of retries. Some types of DNRIOEs want us
// to reset the scanner and come back in again.
// Unfortunately, DNRIOE is used in two different semantics.
// (1) The first is to close the client scanner and bubble up the exception all the way
// to the application. This is preferred when the exception is really un-recoverable
// (like CorruptHFileException, etc). Plain DoNotRetryIOException also falls into this
// bucket usually.
// (2) Second semantics is to close the current region scanner only, but continue the
// client scanner by overriding the exception. This is usually UnknownScannerException,
// OutOfOrderScannerNextException, etc where the region scanner has to be closed, but the
// application-level ClientScanner has to continue without bubbling up the exception to
// the client. See RSRpcServices to see how it throws DNRIOE's.
// See also: HBASE-16604, HBASE-17187
// If exception is any but the list below throw it back to the client; else setup
// the scanner and retry.
@ -421,6 +432,9 @@ public abstract class ClientScanner extends AbstractClientScanner {
e instanceof ScannerResetException) {
// Pass. It is easier writing the if loop test as list of what is allowed rather than
// as a list of what is not allowed... so if in here, it means we do not throw.
if (retriesLeft <= 0) {
throw e; // no more retries
}
} else {
throw e;
}
@ -483,6 +497,9 @@ public abstract class ClientScanner extends AbstractClientScanner {
// This flag is set when we want to skip the result returned. We do
// this when we reset scanner because it split under us.
MutableBoolean retryAfterOutOfOrderException = new MutableBoolean(true);
// Even if we are retrying due to UnknownScannerException, ScannerResetException, etc. we should
// make sure that we are not retrying indefinitely.
int retriesLeft = getRetries();
for (;;) {
try {
// Server returns a null values if scanning is to stop. Else,
@ -511,7 +528,7 @@ public abstract class ClientScanner extends AbstractClientScanner {
}
retryAfterOutOfOrderException.setValue(true);
} catch (DoNotRetryIOException e) {
handleScanError(e, retryAfterOutOfOrderException);
handleScanError(e, retryAfterOutOfOrderException, retriesLeft--);
// reopen the scanner
values = nextScannerWithRetries(countdown);
if (values == null) {

12
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RSRpcServices.java
View File

@ -3090,7 +3090,17 @@ public class RSRpcServices implements HBaseRPCErrorHandler,
// row that the client has last seen.
closeScanner(region, scanner, scannerName, context);
// rethrow DoNotRetryIOException. This can avoid the retry in ClientScanner.
// If it is a DoNotRetryIOException already, throw as it is. Unfortunately, DNRIOE is
// used in two different semantics.
// (1) The first is to close the client scanner and bubble up the exception all the way
// to the application. This is preferred when the exception is really un-recoverable
// (like CorruptHFileException, etc). Plain DoNotRetryIOException also falls into this
// bucket usually.
// (2) Second semantics is to close the current region scanner only, but continue the
// client scanner by overriding the exception. This is usually UnknownScannerException,
// OutOfOrderScannerNextException, etc where the region scanner has to be closed, but the
// application-level ClientScanner has to continue without bubbling up the exception to
// the client. See ClientScanner code to see how it deals with these special exceptions.
if (e instanceof DoNotRetryIOException) {
throw e;
}

77
hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestFromClientSide.java
View File

@ -43,6 +43,7 @@ import java.util.UUID;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
@ -52,6 +53,7 @@ import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellUtil;
import org.apache.hadoop.hbase.DoNotRetryIOException;
import org.apache.hadoop.hbase.HBaseTestingUtility;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HConstants;
@ -71,6 +73,7 @@ import org.apache.hadoop.hbase.coprocessor.CoprocessorHost;
import org.apache.hadoop.hbase.coprocessor.MultiRowMutationEndpoint;
import org.apache.hadoop.hbase.coprocessor.ObserverContext;
import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;
import org.apache.hadoop.hbase.exceptions.ScannerResetException;
import org.apache.hadoop.hbase.filter.BinaryComparator;
import org.apache.hadoop.hbase.filter.CompareFilter;
import org.apache.hadoop.hbase.filter.CompareFilter.CompareOp;
@ -546,6 +549,15 @@ public class TestFromClientSide {
*/
public static class ExceptionInReseekRegionObserver extends BaseRegionObserver {
static AtomicLong reqCount = new AtomicLong(0);
static AtomicBoolean isDoNotRetry = new AtomicBoolean(false); // whether to throw DNRIOE
static AtomicBoolean throwOnce = new AtomicBoolean(true); // whether to only throw once
static void reset() {
reqCount.set(0);
isDoNotRetry.set(false);
throwOnce.set(true);
}
class MyStoreScanner extends StoreScanner {
public MyStoreScanner(Store store, ScanInfo scanInfo, Scan scan, NavigableSet<byte[]> columns,
long readPt) throws IOException {
@ -561,8 +573,13 @@ public class TestFromClientSide {
newScanners.add(new DelegatingKeyValueScanner(scanner) {
@Override
public boolean reseek(Cell key) throws IOException {
if (reqCount.incrementAndGet() == 1) {
throw new IOException("Injected exception");
reqCount.incrementAndGet();
if (!throwOnce.get()|| reqCount.get() == 1) {
if (isDoNotRetry.get()) {
throw new DoNotRetryIOException("Injected exception");
} else {
throw new IOException("Injected exception");
}
}
return super.reseek(key);
}
@ -596,6 +613,8 @@ public class TestFromClientSide {
HTableDescriptor htd = TEST_UTIL.createTableDescriptor(name, FAMILY);
htd.addCoprocessor(ExceptionInReseekRegionObserver.class.getName());
TEST_UTIL.getAdmin().createTable(htd);
ExceptionInReseekRegionObserver.reset();
ExceptionInReseekRegionObserver.throwOnce.set(true); // throw exceptions only once
try (Table t = TEST_UTIL.getConnection().getTable(name)) {
int rowCount = TEST_UTIL.loadTable(t, FAMILY, false);
TEST_UTIL.getAdmin().flush(name);
@ -605,6 +624,60 @@ public class TestFromClientSide {
assertTrue(ExceptionInReseekRegionObserver.reqCount.get() > 0);
}
/**
* Tests the case where a coprocessor throws a DoNotRetryIOException in the scan. The expectation
* is that the exception will bubble up to the client scanner instead of being retried.
*/
@Test (timeout = 180000)
public void testScannerThrowsExceptionWhenCoprocessorThrowsDNRIOE()
throws IOException, InterruptedException {
TEST_UTIL.getConfiguration().setBoolean("hbase.client.log.scanner.activity", true);
TableName name = TableName.valueOf("testClientScannerIsNotRetriedWhenCoprocessorThrowsDNRIOE");
HTableDescriptor htd = TEST_UTIL.createTableDescriptor(name, FAMILY);
htd.addCoprocessor(ExceptionInReseekRegionObserver.class.getName());
TEST_UTIL.getAdmin().createTable(htd);
ExceptionInReseekRegionObserver.reset();
ExceptionInReseekRegionObserver.isDoNotRetry.set(true);
try (Table t = TEST_UTIL.getConnection().getTable(name)) {
TEST_UTIL.loadTable(t, FAMILY, false);
TEST_UTIL.getAdmin().flush(name);
TEST_UTIL.countRows(t, new Scan().addColumn(FAMILY, FAMILY));
fail("Should have thrown an exception");
} catch (DoNotRetryIOException expected) {
// expected
}
assertTrue(ExceptionInReseekRegionObserver.reqCount.get() > 0);
}
/**
* Tests the case where a coprocessor throws a regular IOException in the scan. The expectation
* is that the we will keep on retrying, but fail after the retries are exhausted instead of
* retrying indefinitely.
*/
@Test (timeout = 180000)
public void testScannerFailsAfterRetriesWhenCoprocessorThrowsIOE()
throws IOException, InterruptedException {
TEST_UTIL.getConfiguration().setBoolean("hbase.client.log.scanner.activity", true);
TableName name = TableName.valueOf("testScannerFailsAfterRetriesWhenCoprocessorThrowsIOE");
TEST_UTIL.getConfiguration().setInt(HConstants.HBASE_CLIENT_RETRIES_NUMBER, 3);
HTableDescriptor htd = TEST_UTIL.createTableDescriptor(name, FAMILY);
htd.addCoprocessor(ExceptionInReseekRegionObserver.class.getName());
TEST_UTIL.getAdmin().createTable(htd);
ExceptionInReseekRegionObserver.reset();
ExceptionInReseekRegionObserver.throwOnce.set(false); // throw exceptions in every retry
try (Table t = TEST_UTIL.getConnection().getTable(name)) {
TEST_UTIL.loadTable(t, FAMILY, false);
TEST_UTIL.getAdmin().flush(name);
TEST_UTIL.countRows(t, new Scan().addColumn(FAMILY, FAMILY));
fail("Should have thrown an exception");
} catch (DoNotRetryIOException expected) {
assertTrue(expected instanceof ScannerResetException);
// expected
}
assertTrue(ExceptionInReseekRegionObserver.reqCount.get() >= 3);
}
/*
* @param key
* @return Scan with RowFilter that does LESS than passed key.