KAFKA-3196: Add checksum and size to RecordMetadata and ConsumerRecord (#770 / #594)

kafka/consumer/fetcher.py

@@ -20,7 +20,8 @@ log = logging.getLogger(__name__)
 
 
 ConsumerRecord = collections.namedtuple("ConsumerRecord",
-    ["topic", "partition", "offset", "timestamp", "timestamp_type", "key", "value"])
+    ["topic", "partition", "offset", "timestamp", "timestamp_type",
+     "key", "value", "checksum", "serialized_key_size", "serialized_value_size"])
 
 
 class NoOffsetForPartitionError(Errors.KafkaError):
@@ -410,13 +411,17 @@ class Fetcher(six.Iterator):
                         key, value = self._deserialize(inner_msg)
                         yield ConsumerRecord(tp.topic, tp.partition, inner_offset,
                                              inner_timestamp, msg.timestamp_type,
-                                             key, value)
+                                             key, value, inner_msg.crc,
+                                             len(inner_msg.key) if inner_msg.key is not None else -1,
+                                             len(inner_msg.value) if inner_msg.value is not None else -1)
 
                 else:
                     key, value = self._deserialize(msg)
                     yield ConsumerRecord(tp.topic, tp.partition, offset,
                                          msg.timestamp, msg.timestamp_type,
-                                         key, value)
+                                         key, value, msg.crc,
+                                         len(msg.key) if msg.key is not None else -1,
+                                         len(msg.value) if msg.value is not None else -1)
 
         # If unpacking raises StopIteration, it is erroneously
         # caught by the generator. We want all exceptions to be raised

kafka/producer/buffer.py

@@ -59,7 +59,7 @@ class MessageSetBuffer(object):
         self._final_size = None
 
     def append(self, offset, message):
-        """Apend a Message to the MessageSet.
+        """Append a Message to the MessageSet.
 
         Arguments:
             offset (int): offset of the message

kafka/producer/future.py

@@ -29,22 +29,29 @@ class FutureProduceResult(Future):
 
 
 class FutureRecordMetadata(Future):
-    def __init__(self, produce_future, relative_offset, timestamp_ms):
+    def __init__(self, produce_future, relative_offset, timestamp_ms, checksum, serialized_key_size, serialized_value_size):
         super(FutureRecordMetadata, self).__init__()
         self._produce_future = produce_future
-        self.relative_offset = relative_offset
-        self.timestamp_ms = timestamp_ms
+        # packing args as a tuple is a minor speed optimization
+        self.args = (relative_offset, timestamp_ms, checksum, serialized_key_size, serialized_value_size)
         produce_future.add_callback(self._produce_success)
         produce_future.add_errback(self.failure)
 
     def _produce_success(self, offset_and_timestamp):
-        offset, timestamp_ms = offset_and_timestamp
-        if timestamp_ms is None:
-            timestamp_ms = self.timestamp_ms
-        if offset != -1 and self.relative_offset is not None:
-            offset += self.relative_offset
+        offset, produce_timestamp_ms = offset_and_timestamp
+
+        # Unpacking from args tuple is minor speed optimization
+        (relative_offset, timestamp_ms, checksum,
+         serialized_key_size, serialized_value_size) = self.args
+
+        if produce_timestamp_ms is not None:
+            timestamp_ms = produce_timestamp_ms
+        if offset != -1 and relative_offset is not None:
+            offset += relative_offset
         tp = self._produce_future.topic_partition
-        metadata = RecordMetadata(tp[0], tp[1], tp, offset, timestamp_ms)
+        metadata = RecordMetadata(tp[0], tp[1], tp, offset, timestamp_ms,
+                                  checksum, serialized_key_size,
+                                  serialized_value_size)
         self.success(metadata)
 
     def get(self, timeout=None):
@@ -57,4 +64,6 @@ class FutureRecordMetadata(Future):
         return self.value
 
 
-RecordMetadata = collections.namedtuple('RecordMetadata', 'topic partition topic_partition offset timestamp')
+RecordMetadata = collections.namedtuple(
+    'RecordMetadata', ['topic', 'partition', 'topic_partition', 'offset', 'timestamp',
+                       'checksum', 'serialized_key_size', 'serialized_value_size'])

kafka/producer/kafka.py

@@ -457,6 +457,7 @@ class KafkaProducer(object):
         assert value is not None or self.config['api_version'] >= (0, 8, 1), (
             'Null messages require kafka >= 0.8.1')
         assert not (value is None and key is None), 'Need at least one: key or value'
+        key_bytes = value_bytes = None
         try:
             # first make sure the metadata for the topic is
             # available
@@ -497,10 +498,11 @@ class KafkaProducer(object):
         except Exception as e:
             log.debug("Exception occurred during message send: %s", e)
             return FutureRecordMetadata(
-                FutureProduceResult(
-                    TopicPartition(topic, partition)),
-                    -1, None
-                ).failure(e)
+                FutureProduceResult(TopicPartition(topic, partition)),
+                -1, None, None,
+                len(key_bytes) if key_bytes is not None else -1,
+                len(value_bytes) if value_bytes is not None else -1
+            ).failure(e)
 
     def flush(self, timeout=None):
         """

kafka/producer/record_accumulator.py

@@ -57,10 +57,13 @@ class RecordBatch(object):
 
         msg = Message(value, key=key, magic=self.message_version)
         record_size = self.records.append(self.record_count, msg)
+        checksum = msg.crc # crc is recalculated during records.append()
         self.max_record_size = max(self.max_record_size, record_size)
         self.last_append = time.time()
         future = FutureRecordMetadata(self.produce_future, self.record_count,
-                                      timestamp_ms)
+                                      timestamp_ms, checksum,
+                                      len(key) if key is not None else -1,
+                                      len(value) if value is not None else -1)
         self.record_count += 1
         return future