sohami closed pull request #1360: DRILL-6578: Handle query cancellation in
Parquet reader
URL: https://github.com/apache/drill/pull/1360
This is a PR merged from a forked repository.
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diff --git
a/common/src/main/java/org/apache/drill/common/exceptions/DrillRuntimeException.java
b/common/src/main/java/org/apache/drill/common/exceptions/DrillRuntimeException.java
index 98b1a9d0302..b6ced84d0aa 100644
---
a/common/src/main/java/org/apache/drill/common/exceptions/DrillRuntimeException.java
+++
b/common/src/main/java/org/apache/drill/common/exceptions/DrillRuntimeException.java
@@ -48,4 +48,22 @@ public static void format(String format, Object...args) {
public static void format(Throwable cause, String format, Object...args) {
throw new DrillRuntimeException(String.format(format, args), cause);
}
+
+ /**
+ * This method can be called within loops to check whether the current
thread has been
+ * interrupted; it ensures that operator implementation can respond to query
cancellation
+ * in a timely manner.
+ *
+ * <p>Calling this method will result in the following behavior:
+ * <ul>
+ * <li>Throws a runtime exception if current thread interrupt flag has been
set
+ * <li>Clears current thread interrupt flag
+ * </ul>
+ */
+ public static void checkInterrupted() {
+ if (Thread.interrupted()) {
+ // This exception will ensure the control layer will immediately get
back control
+ throw new DrillRuntimeException("Interrupt received; aborting current
operation");
+ }
+ }
}
diff --git a/exec/vector/src/main/codegen/templates/VariableLengthVectors.java
b/exec/vector/src/main/codegen/templates/VariableLengthVectors.java
index c35728ec2c6..8dd8eb19aae 100644
--- a/exec/vector/src/main/codegen/templates/VariableLengthVectors.java
+++ b/exec/vector/src/main/codegen/templates/VariableLengthVectors.java
@@ -19,7 +19,7 @@
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.Set;
-
+import org.apache.drill.common.exceptions.DrillRuntimeException;
import org.apache.drill.exec.exception.OutOfMemoryException;
import org.apache.drill.exec.memory.AllocationManager.BufferLedger;
import org.apache.drill.exec.vector.BaseDataValueVector;
@@ -641,6 +641,8 @@ public void setSafe(int index, byte[] bytes) {
if (callback != null) {
callback.onNewBulkEntry(entry);
}
+
+ DrillRuntimeException.checkInterrupted(); // Ensures fast handling of
query cancellation
}
// Flush any data not yet copied to this VL container
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