diff --git a/extensions-contrib/opencensus-extensions/src/main/java/org/apache/druid/data/input/opencensus/protobuf/OpenCensusProtobufReader.java b/extensions-contrib/opencensus-extensions/src/main/java/org/apache/druid/data/input/opencensus/protobuf/OpenCensusProtobufReader.java
index 1ce97e587b3fe..249a5d096d96c 100644
--- a/extensions-contrib/opencensus-extensions/src/main/java/org/apache/druid/data/input/opencensus/protobuf/OpenCensusProtobufReader.java
+++ b/extensions-contrib/opencensus-extensions/src/main/java/org/apache/druid/data/input/opencensus/protobuf/OpenCensusProtobufReader.java
@@ -19,6 +19,8 @@
 
 package org.apache.druid.data.input.opencensus.protobuf;
 
+import com.google.common.base.Supplier;
+import com.google.common.base.Suppliers;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
@@ -42,6 +44,7 @@
 import java.time.Instant;
 import java.util.ArrayList;
 import java.util.HashSet;
+import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
@@ -80,7 +83,17 @@ private interface LabelContext
   @Override
   public CloseableIterator<InputRow> read()
   {
-    return CloseableIterators.withEmptyBaggage(readAsList().iterator());
+    Supplier<Iterator<InputRow>> supplier = Suppliers.memoize(() -> readAsList().iterator());
+    return CloseableIterators.withEmptyBaggage(new Iterator<InputRow>() {
+      @Override
+      public boolean hasNext() {
+        return supplier.get().hasNext();
+      }
+      @Override
+      public InputRow next() {
+        return supplier.get().next();
+      }
+    });
   }
 
   List<InputRow> readAsList()
diff --git a/extensions-contrib/opencensus-extensions/src/test/java/org/apache/druid/data/input/opencensus/protobuf/OpenTelemetryMetricsProtobufReaderTest.java b/extensions-contrib/opencensus-extensions/src/test/java/org/apache/druid/data/input/opencensus/protobuf/OpenCensusProtobufReaderTest.java
similarity index 93%
rename from extensions-contrib/opencensus-extensions/src/test/java/org/apache/druid/data/input/opencensus/protobuf/OpenTelemetryMetricsProtobufReaderTest.java
rename to extensions-contrib/opencensus-extensions/src/test/java/org/apache/druid/data/input/opencensus/protobuf/OpenCensusProtobufReaderTest.java
index 0c8902df560b6..43ef6d455d85a 100644
--- a/extensions-contrib/opencensus-extensions/src/test/java/org/apache/druid/data/input/opencensus/protobuf/OpenTelemetryMetricsProtobufReaderTest.java
+++ b/extensions-contrib/opencensus-extensions/src/test/java/org/apache/druid/data/input/opencensus/protobuf/OpenCensusProtobufReaderTest.java
@@ -32,6 +32,7 @@
 import org.apache.druid.data.input.impl.TimestampSpec;
 import org.apache.druid.data.input.kafka.KafkaRecordEntity;
 import org.apache.druid.java.util.common.parsers.CloseableIterator;
+import org.apache.druid.java.util.common.parsers.ParseException;
 import org.apache.kafka.clients.consumer.ConsumerRecord;
 import org.apache.kafka.common.header.Header;
 import org.apache.kafka.common.header.Headers;
@@ -52,7 +53,7 @@
 import java.util.List;
 import java.util.concurrent.TimeUnit;
 
-public class OpenTelemetryMetricsProtobufReaderTest
+public class OpenCensusProtobufReaderTest
 {
   private static final long TIMESTAMP = TimeUnit.MILLISECONDS.toNanos(Instant.parse("2019-07-12T09:30:01.123Z").toEpochMilli());
   public static final String RESOURCE_ATTRIBUTE_COUNTRY = "country";
@@ -325,6 +326,27 @@ public void testDimensionSpecExclusions() throws IOException
     Assert.assertFalse(row.getDimensions().contains("descriptor.color"));
   }
 
+  @Test
+  public void testInvalidProtobuf() throws IOException {
+    byte[] invalidProtobuf = new byte[] { 0x00, 0x01 };
+    ConsumerRecord consumerRecord = new ConsumerRecord(TOPIC, PARTITION, OFFSET, TS, TSTYPE,
+        -1L, -1, -1, null, invalidProtobuf, HEADERS);
+    KafkaRecordEntity kafkaRecordEntity = new KafkaRecordEntity(consumerRecord);
+    OpenCensusProtobufInputFormat inputFormat = new OpenCensusProtobufInputFormat("metric.name",
+        null,
+        "descriptor.",
+        "custom.");
+
+    CloseableIterator<InputRow> rows = inputFormat.createReader(new InputRowSchema(
+        new TimestampSpec("timestamp", "iso", null),
+        dimensionsSpec,
+        ColumnsFilter.all()
+    ), kafkaRecordEntity, null).read();
+
+    Assert.assertThrows(ParseException.class, () -> rows.hasNext());
+    Assert.assertThrows(ParseException.class, () -> rows.next());
+  }
+
   private void assertDimensionEquals(InputRow row, String dimension, Object expected)
   {
     List<String> values = row.getDimension(dimension);
diff --git a/extensions-contrib/opentelemetry-extensions/src/main/java/org/apache/druid/data/input/opentelemetry/protobuf/OpenTelemetryMetricsProtobufReader.java b/extensions-contrib/opentelemetry-extensions/src/main/java/org/apache/druid/data/input/opentelemetry/protobuf/OpenTelemetryMetricsProtobufReader.java
index 20f9cb533891a..f5d191cbee372 100644
--- a/extensions-contrib/opentelemetry-extensions/src/main/java/org/apache/druid/data/input/opentelemetry/protobuf/OpenTelemetryMetricsProtobufReader.java
+++ b/extensions-contrib/opentelemetry-extensions/src/main/java/org/apache/druid/data/input/opentelemetry/protobuf/OpenTelemetryMetricsProtobufReader.java
@@ -19,6 +19,8 @@
 
 package org.apache.druid.data.input.opentelemetry.protobuf;
 
+import com.google.common.base.Supplier;
+import com.google.common.base.Suppliers;
 import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
 import com.google.protobuf.InvalidProtocolBufferException;
@@ -40,6 +42,7 @@
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.TimeUnit;
@@ -47,7 +50,6 @@
 
 public class OpenTelemetryMetricsProtobufReader implements InputEntityReader
 {
-
   private final ByteEntity source;
   private final String metricDimension;
   private final String valueDimension;
@@ -75,7 +77,17 @@ public OpenTelemetryMetricsProtobufReader(
   @Override
   public CloseableIterator<InputRow> read()
   {
-    return CloseableIterators.withEmptyBaggage(readAsList().iterator());
+    Supplier<Iterator<InputRow>> supplier = Suppliers.memoize(() -> readAsList().iterator());
+    return CloseableIterators.withEmptyBaggage(new Iterator<InputRow>() {
+      @Override
+      public boolean hasNext() {
+        return supplier.get().hasNext();
+      }
+      @Override
+      public InputRow next() {
+        return supplier.get().next();
+      }
+    });
   }
 
   List<InputRow> readAsList()
diff --git a/extensions-contrib/opentelemetry-extensions/src/test/java/org/apache/druid/data/input/opentelemetry/protobuf/OpenTelemetryMetricsProtobufReaderTest.java b/extensions-contrib/opentelemetry-extensions/src/test/java/org/apache/druid/data/input/opentelemetry/protobuf/OpenTelemetryMetricsProtobufReaderTest.java
index a4d85ece1d79d..8e36a0b4fc35e 100644
--- a/extensions-contrib/opentelemetry-extensions/src/test/java/org/apache/druid/data/input/opentelemetry/protobuf/OpenTelemetryMetricsProtobufReaderTest.java
+++ b/extensions-contrib/opentelemetry-extensions/src/test/java/org/apache/druid/data/input/opentelemetry/protobuf/OpenTelemetryMetricsProtobufReaderTest.java
@@ -30,6 +30,7 @@
 import org.apache.druid.data.input.impl.DimensionsSpec;
 import org.apache.druid.data.input.impl.StringDimensionSchema;
 import org.apache.druid.java.util.common.parsers.CloseableIterator;
+import org.apache.druid.java.util.common.parsers.ParseException;
 import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Rule;
@@ -342,6 +343,21 @@ public void testUnsupportedValueTypes()
     assertDimensionEquals(row, "raw.value", "6");
   }
 
+  @Test
+  public void testInvalidProtobuf() {
+    byte[] invalidProtobuf = new byte[] { 0x00, 0x01 };
+    CloseableIterator<InputRow> rows = new OpenTelemetryMetricsProtobufReader(
+        dimensionsSpec,
+        new ByteEntity(invalidProtobuf),
+        "metric.name",
+        "raw.value",
+        "descriptor.",
+        "custom."
+    ).read();
+    Assert.assertThrows(ParseException.class, () -> rows.hasNext());
+    Assert.assertThrows(ParseException.class, () -> rows.next());
+  }
+
   private void assertDimensionEquals(InputRow row, String dimension, Object expected)
   {
     List<String> values = row.getDimension(dimension);