chore: skip the internal retry if last_statement is set

olavloite · olavloite · commit 19dc55912d6e · 2025-10-31T10:11:31.000+01:00
If the first statement in a transaction carries an InlineBeginTransaction option,
the transaction will be retried if the statement fails, as the RPC did not return
a transaction ID. This retry can be skipped if the statement also carried the
last_statement flag, as no more statements are allowed after that statement.
diff --git a/google-cloud-spanner/src/main/java/com/google/cloud/spanner/AbstractReadContext.java b/google-cloud-spanner/src/main/java/com/google/cloud/spanner/AbstractReadContext.java
@@ -818,7 +818,11 @@ CloseableIterator<PartialResultSet> startStream(
               @Nullable ByteString resumeToken,
               AsyncResultSet.StreamMessageListener streamListener) {
             GrpcStreamIterator stream =
-                new GrpcStreamIterator(statement, prefetchChunks, cancelQueryWhenClientIsClosed);
+                new GrpcStreamIterator(
+                    statement,
+                    request.getLastStatement(),
+                    prefetchChunks,
+                    cancelQueryWhenClientIsClosed);
             if (streamListener != null) {
               stream.registerListener(streamListener);
             }
@@ -935,7 +939,8 @@ String getTransactionTag() {
   public void onTransactionMetadata(Transaction transaction, boolean shouldIncludeId) {}
 
   @Override
-  public SpannerException onError(SpannerException e, boolean withBeginTransaction) {
+  public SpannerException onError(
+      SpannerException e, boolean withBeginTransaction, boolean lastStatement) {
     this.session.onError(e);
     return e;
   }
@@ -1009,6 +1014,8 @@ ResultSet readInternalWithOptions(
     }
     final int prefetchChunks =
         readOptions.hasPrefetchChunks() ? readOptions.prefetchChunks() : defaultPrefetchChunks;
+    final boolean lastStatement =
+        readOptions.hasLastStatement() ? readOptions.isLastStatement() : false;
     ResumableStreamIterator stream =
         new ResumableStreamIterator(
             MAX_BUFFERED_CHUNKS,
@@ -1025,7 +1032,8 @@ CloseableIterator<PartialResultSet> startStream(
               @Nullable ByteString resumeToken,
               AsyncResultSet.StreamMessageListener streamListener) {
             GrpcStreamIterator stream =
-                new GrpcStreamIterator(prefetchChunks, cancelQueryWhenClientIsClosed);
+                new GrpcStreamIterator(
+                    lastStatement, prefetchChunks, cancelQueryWhenClientIsClosed);
             if (streamListener != null) {
               stream.registerListener(streamListener);
             }
diff --git a/google-cloud-spanner/src/main/java/com/google/cloud/spanner/AbstractResultSet.java b/google-cloud-spanner/src/main/java/com/google/cloud/spanner/AbstractResultSet.java
@@ -56,7 +56,8 @@ void onTransactionMetadata(Transaction transaction, boolean shouldIncludeId)
         throws SpannerException;
 
     /** Called when the read finishes with an error. Returns the error that should be thrown. */
-    SpannerException onError(SpannerException e, boolean withBeginTransaction);
+    SpannerException onError(
+        SpannerException e, boolean withBeginTransaction, boolean lastStatement);
 
     /** Called when the read finishes normally. */
     void onDone(boolean withBeginTransaction);
@@ -153,6 +154,8 @@ interface CloseableIterator<T> extends Iterator<T> {
 
     boolean isWithBeginTransaction();
 
+    boolean isLastStatement();
+
     /**
      * @param streamMessageListener A class object which implements StreamMessageListener
      * @return true if streaming is supported by the iterator, otherwise false
diff --git a/google-cloud-spanner/src/main/java/com/google/cloud/spanner/GrpcResultSet.java b/google-cloud-spanner/src/main/java/com/google/cloud/spanner/GrpcResultSet.java
@@ -109,7 +109,8 @@ public boolean next() throws SpannerException {
     } catch (Throwable t) {
       throw yieldError(
           SpannerExceptionFactory.asSpannerException(t),
-          iterator.isWithBeginTransaction() && currRow == null);
+          iterator.isWithBeginTransaction() && currRow == null,
+          iterator.isLastStatement());
     }
   }
 
@@ -149,8 +150,9 @@ public Type getType() {
     return currRow.getType();
   }
 
-  private SpannerException yieldError(SpannerException e, boolean beginTransaction) {
-    SpannerException toThrow = listener.onError(e, beginTransaction);
+  private SpannerException yieldError(
+      SpannerException e, boolean beginTransaction, boolean lastStatement) {
+    SpannerException toThrow = listener.onError(e, beginTransaction, lastStatement);
     close();
     throw toThrow;
   }
diff --git a/google-cloud-spanner/src/main/java/com/google/cloud/spanner/GrpcStreamIterator.java b/google-cloud-spanner/src/main/java/com/google/cloud/spanner/GrpcStreamIterator.java
@@ -49,20 +49,26 @@ class GrpcStreamIterator extends AbstractIterator<PartialResultSet>
 
   private SpannerRpc.StreamingCall call;
   private volatile boolean withBeginTransaction;
+  private final boolean lastStatement;
   private TimeUnit streamWaitTimeoutUnit;
   private long streamWaitTimeoutValue;
   private SpannerException error;
   private boolean done;
 
   @VisibleForTesting
-  GrpcStreamIterator(int prefetchChunks, boolean cancelQueryWhenClientIsClosed) {
-    this(null, prefetchChunks, cancelQueryWhenClientIsClosed);
+  GrpcStreamIterator(
+      boolean lastStatement, int prefetchChunks, boolean cancelQueryWhenClientIsClosed) {
+    this(null, lastStatement, prefetchChunks, cancelQueryWhenClientIsClosed);
   }
 
   @VisibleForTesting
   GrpcStreamIterator(
-      Statement statement, int prefetchChunks, boolean cancelQueryWhenClientIsClosed) {
+      Statement statement,
+      boolean lastStatement,
+      int prefetchChunks,
+      boolean cancelQueryWhenClientIsClosed) {
     this.statement = statement;
+    this.lastStatement = lastStatement;
     this.prefetchChunks = prefetchChunks;
     this.consumer = new ConsumerImpl(cancelQueryWhenClientIsClosed);
     // One extra to allow for END_OF_STREAM message.
@@ -118,6 +124,11 @@ public boolean isWithBeginTransaction() {
     return withBeginTransaction;
   }
 
+  @Override
+  public boolean isLastStatement() {
+    return lastStatement;
+  }
+
   @Override
   protected final PartialResultSet computeNext() {
     PartialResultSet next;
diff --git a/google-cloud-spanner/src/main/java/com/google/cloud/spanner/GrpcValueIterator.java b/google-cloud-spanner/src/main/java/com/google/cloud/spanner/GrpcValueIterator.java
@@ -183,6 +183,10 @@ boolean isWithBeginTransaction() {
     return stream.isWithBeginTransaction();
   }
 
+  boolean isLastStatement() {
+    return stream.isLastStatement();
+  }
+
   /**
    * @param a is a mutable list and b will be concatenated into a.
    */
diff --git a/google-cloud-spanner/src/main/java/com/google/cloud/spanner/ResumableStreamIterator.java b/google-cloud-spanner/src/main/java/com/google/cloud/spanner/ResumableStreamIterator.java
@@ -242,6 +242,11 @@ public boolean isWithBeginTransaction() {
     return stream != null && stream.isWithBeginTransaction();
   }
 
+  @Override
+  public boolean isLastStatement() {
+    return stream != null && stream.isLastStatement();
+  }
+
   @Override
   @InternalApi
   public boolean initiateStreaming(AsyncResultSet.StreamMessageListener streamMessageListener) {
diff --git a/google-cloud-spanner/src/main/java/com/google/cloud/spanner/TransactionRunnerImpl.java b/google-cloud-spanner/src/main/java/com/google/cloud/spanner/TransactionRunnerImpl.java
@@ -559,7 +559,11 @@ public void run() {
                     span.addAnnotation("Commit Failed", resultException);
                     opSpan.setStatus(resultException);
                     opSpan.end();
-                    res.setException(onError(resultException, false));
+                    res.setException(
+                        onError(
+                            resultException,
+                            /* withBeginTransaction= */ false,
+                            /* lastStatement= */ true));
                   } catch (Throwable unexpectedError) {
                     // This is a safety precaution to make sure that a result is always returned.
                     res.setException(unexpectedError);
@@ -759,8 +763,9 @@ MultiplexedSessionPrecommitToken getLatestPrecommitToken() {
     }
 
     @Override
-    public SpannerException onError(SpannerException e, boolean withBeginTransaction) {
-      e = super.onError(e, withBeginTransaction);
+    public SpannerException onError(
+        SpannerException e, boolean withBeginTransaction, boolean lastStatement) {
+      e = super.onError(e, withBeginTransaction, lastStatement);
 
       // If the statement that caused an error was the statement that included a BeginTransaction
       // option, we simulate an aborted transaction to force a retry of the entire transaction. This
@@ -770,13 +775,17 @@ public SpannerException onError(SpannerException e, boolean withBeginTransaction
       // statement are included in the transaction, even if the statement again causes an error
       // during the retry.
       if (withBeginTransaction) {
-        // Simulate an aborted transaction to force a retry with a new transaction.
-        this.transactionIdFuture.setException(
-            SpannerExceptionFactory.newSpannerException(
-                ErrorCode.ABORTED,
-                "Aborted due to failed initial statement",
-                SpannerExceptionFactory.createAbortedExceptionWithRetryDelay(
-                    "Aborted due to failed initial statement", e, 0, 1)));
+        if (lastStatement) {
+          this.transactionIdFuture.setException(e);
+        } else {
+          // Simulate an aborted transaction to force a retry with a new transaction.
+          this.transactionIdFuture.setException(
+              SpannerExceptionFactory.newSpannerException(
+                  ErrorCode.ABORTED,
+                  "Aborted due to failed initial statement",
+                  SpannerExceptionFactory.createAbortedExceptionWithRetryDelay(
+                      "Aborted due to failed initial statement", e, 0, 1)));
+        }
       }
       SpannerException exceptionToThrow;
       if (withBeginTransaction
@@ -950,7 +959,9 @@ private ResultSet internalExecuteUpdate(
         return resultSet;
       } catch (Throwable t) {
         throw onError(
-            SpannerExceptionFactory.asSpannerException(t), builder.getTransaction().hasBegin());
+            SpannerExceptionFactory.asSpannerException(t),
+            builder.getTransaction().hasBegin(),
+            builder.getLastStatement());
       }
     }
 
@@ -1008,7 +1019,7 @@ public ApiFuture<Long> executeUpdateAsync(Statement statement, UpdateOption... u
                 input -> {
                   SpannerException e = SpannerExceptionFactory.asSpannerException(input);
                   SpannerException exceptionToThrow =
-                      onError(e, builder.getTransaction().hasBegin());
+                      onError(e, builder.getTransaction().hasBegin(), builder.getLastStatement());
                   span.setStatus(exceptionToThrow);
                   throw exceptionToThrow;
                 },
@@ -1099,7 +1110,9 @@ public long[] batchUpdate(Iterable<Statement> statements, UpdateOption... update
           return results;
         } catch (Throwable e) {
           throw onError(
-              SpannerExceptionFactory.asSpannerException(e), builder.getTransaction().hasBegin());
+              SpannerExceptionFactory.asSpannerException(e),
+              builder.getTransaction().hasBegin(),
+              builder.getLastStatements());
         }
       } catch (Throwable throwable) {
         span.setStatus(throwable);
@@ -1178,7 +1191,7 @@ public ApiFuture<long[]> batchUpdateAsync(
                 input -> {
                   SpannerException e = SpannerExceptionFactory.asSpannerException(input);
                   SpannerException exceptionToThrow =
-                      onError(e, builder.getTransaction().hasBegin());
+                      onError(e, builder.getTransaction().hasBegin(), builder.getLastStatements());
                   span.setStatus(exceptionToThrow);
                   throw exceptionToThrow;
                 },
diff --git a/google-cloud-spanner/src/test/java/com/google/cloud/spanner/GrpcResultSetTest.java b/google-cloud-spanner/src/test/java/com/google/cloud/spanner/GrpcResultSetTest.java
@@ -75,7 +75,8 @@ public void onTransactionMetadata(Transaction transaction, boolean shouldInclude
         throws SpannerException {}
 
     @Override
-    public SpannerException onError(SpannerException e, boolean withBeginTransaction) {
+    public SpannerException onError(
+        SpannerException e, boolean withBeginTransaction, boolean lastStatement) {
       return e;
     }
 
@@ -88,7 +89,9 @@ public void onPrecommitToken(MultiplexedSessionPrecommitToken token) {}
 
   @Before
   public void setUp() {
-    stream = new GrpcStreamIterator(10, /* cancelQueryWhenClientIsClosed= */ false);
+    stream =
+        new GrpcStreamIterator(
+            /* lastStatement= */ false, 10, /* cancelQueryWhenClientIsClosed= */ false);
     stream.setCall(
         new SpannerRpc.StreamingCall() {
           @Override
diff --git a/google-cloud-spanner/src/test/java/com/google/cloud/spanner/ReadFormatTestRunner.java b/google-cloud-spanner/src/test/java/com/google/cloud/spanner/ReadFormatTestRunner.java
@@ -51,7 +51,8 @@ public void onTransactionMetadata(Transaction transaction, boolean shouldInclude
         throws SpannerException {}
 
     @Override
-    public SpannerException onError(SpannerException e, boolean withBeginTransaction) {
+    public SpannerException onError(
+        SpannerException e, boolean withBeginTransaction, boolean lastStatement) {
       return e;
     }
 
@@ -118,7 +119,9 @@ private static class TestCaseRunner {
     }
 
     private void run() throws Exception {
-      stream = new GrpcStreamIterator(10, /* cancelQueryWhenClientIsClosed= */ false);
+      stream =
+          new GrpcStreamIterator(
+              /* lastStatement= */ false, 10, /* cancelQueryWhenClientIsClosed= */ false);
       stream.setCall(
           new SpannerRpc.StreamingCall() {
             @Override
diff --git a/google-cloud-spanner/src/test/java/com/google/cloud/spanner/ResultSetsHelper.java b/google-cloud-spanner/src/test/java/com/google/cloud/spanner/ResultSetsHelper.java
@@ -47,6 +47,11 @@ public boolean isWithBeginTransaction() {
             return false;
           }
 
+          @Override
+          public boolean isLastStatement() {
+            return false;
+          }
+
           @Override
           public boolean hasNext() {
             return first || iterator.hasNext();
@@ -77,7 +82,8 @@ public void onTransactionMetadata(Transaction transaction, boolean shouldInclude
               throws SpannerException {}
 
           @Override
-          public SpannerException onError(SpannerException e, boolean withBeginTransaction) {
+          public SpannerException onError(
+              SpannerException e, boolean withBeginTransaction, boolean isLastStatement) {
             return e;
           }
 
diff --git a/google-cloud-spanner/src/test/java/com/google/cloud/spanner/ResumableStreamIteratorTest.java b/google-cloud-spanner/src/test/java/com/google/cloud/spanner/ResumableStreamIteratorTest.java
@@ -140,6 +140,11 @@ public void close(@Nullable String message) {
     public boolean isWithBeginTransaction() {
       return false;
     }
+
+    @Override
+    public boolean isLastStatement() {
+      return false;
+    }
   }
 
   Starter starter = Mockito.mock(Starter.class);
diff --git a/google-cloud-spanner/src/test/java/com/google/cloud/spanner/connection/AutoCommitMockServerTest.java b/google-cloud-spanner/src/test/java/com/google/cloud/spanner/connection/AutoCommitMockServerTest.java
@@ -20,17 +20,23 @@
 import static com.google.cloud.spanner.connection.ConnectionProperties.READ_LOCK_MODE;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertThrows;
 import static org.junit.Assert.assertTrue;
 
+import com.google.cloud.spanner.ErrorCode;
+import com.google.cloud.spanner.MockSpannerServiceImpl;
 import com.google.cloud.spanner.ResultSet;
+import com.google.cloud.spanner.SpannerException;
 import com.google.cloud.spanner.Statement;
 import com.google.cloud.spanner.connection.ITAbstractSpannerTest.ITConnection;
 import com.google.spanner.v1.BeginTransactionRequest;
 import com.google.spanner.v1.CommitRequest;
 import com.google.spanner.v1.ExecuteBatchDmlRequest;
 import com.google.spanner.v1.ExecuteSqlRequest;
+import com.google.spanner.v1.RollbackRequest;
 import com.google.spanner.v1.TransactionOptions.IsolationLevel;
 import com.google.spanner.v1.TransactionOptions.ReadWrite.ReadLockMode;
+import io.grpc.Status;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
@@ -106,6 +112,34 @@ public void testDml() {
     assertEquals(1, mockSpanner.countRequestsOfType(CommitRequest.class));
   }
 
+  @Test
+  public void testDmlFailed() {
+    Statement invalidInsert = Statement.of("insert into my_table (id, name) values (1, 'test')");
+    mockSpanner.putStatementResult(
+        MockSpannerServiceImpl.StatementResult.exception(
+            invalidInsert,
+            Status.ALREADY_EXISTS.withDescription("Row 1 already exists").asRuntimeException()));
+
+    try (Connection connection = createConnection()) {
+      connection.setAutocommit(true);
+      SpannerException exception =
+          assertThrows(SpannerException.class, () -> connection.executeUpdate(invalidInsert));
+      assertEquals(ErrorCode.ALREADY_EXISTS, exception.getErrorCode());
+    }
+    assertEquals(0, mockSpanner.countRequestsOfType(BeginTransactionRequest.class));
+    assertEquals(1, mockSpanner.countRequestsOfType(ExecuteSqlRequest.class));
+    ExecuteSqlRequest request = mockSpanner.getRequestsOfType(ExecuteSqlRequest.class).get(0);
+    assertTrue(request.getTransaction().hasBegin());
+    assertTrue(request.getTransaction().getBegin().hasReadWrite());
+    assertEquals(isolationLevel, request.getTransaction().getBegin().getIsolationLevel());
+    assertEquals(
+        readLockMode, request.getTransaction().getBegin().getReadWrite().getReadLockMode());
+    assertTrue(request.getLastStatement());
+    // There should be no rollback request on the server, as there was no transaction ID returned
+    // to the client.
+    assertEquals(0, mockSpanner.countRequestsOfType(RollbackRequest.class));
+  }
+
   @Test
   public void testDmlReturning() {
     try (Connection connection = createConnection()) {
diff --git a/google-cloud-spanner/src/test/java/com/google/cloud/spanner/connection/TransactionMockServerTest.java b/google-cloud-spanner/src/test/java/com/google/cloud/spanner/connection/TransactionMockServerTest.java

Original file line number	Diff line number	Diff line change
`@@ -109,7 +109,8 @@ public boolean next() throws SpannerException {`
`109`	`109`	`} catch (Throwable t) {`
`110`	`110`	`throw yieldError(`
`111`	`111`	`SpannerExceptionFactory.asSpannerException(t),`
`112`		`- iterator.isWithBeginTransaction() && currRow == null);`
	`112`	`+ iterator.isWithBeginTransaction() && currRow == null,`
	`113`	`+ iterator.isLastStatement());`
`113`	`114`	`}`
`114`	`115`	`}`
`115`	`116`
`@@ -149,8 +150,9 @@ public Type getType() {`
`149`	`150`	`return currRow.getType();`
`150`	`151`	`}`
`151`	`152`
`152`		`- private SpannerException yieldError(SpannerException e, boolean beginTransaction) {`
`153`		`- SpannerException toThrow = listener.onError(e, beginTransaction);`
	`153`	`+ private SpannerException yieldError(`
	`154`	`+ SpannerException e, boolean beginTransaction, boolean lastStatement) {`
	`155`	`+ SpannerException toThrow = listener.onError(e, beginTransaction, lastStatement);`
`154`	`156`	`close();`
`155`	`157`	`throw toThrow;`
`156`	`158`	`}`