Change Consumer commit() to return True/False and log error; dont raise client exceptions

kafka/consumer/base.py

@@ -8,7 +8,7 @@ from threading import Lock
 import kafka.common
 from kafka.common import (
     OffsetRequest, OffsetCommitRequest, OffsetFetchRequest,
-    UnknownTopicOrPartitionError, check_error
+    UnknownTopicOrPartitionError, check_error, KafkaError
 )
 
 from kafka.util import kafka_bytestring, ReentrantTimer
@@ -114,12 +114,13 @@ class Consumer(object):
                 self.offsets[resp.partition] = resp.offset
 
     def commit(self, partitions=None):
-        """
-        Commit offsets for this consumer
+        """Commit stored offsets to Kafka via OffsetCommitRequest (v0)
 
         Keyword Arguments:
             partitions (list): list of partitions to commit, default is to commit
                 all of them
+
+        Returns: True on success, False on failure
         """
 
         # short circuit if nothing happened. This check is kept outside
@@ -135,22 +136,27 @@ class Consumer(object):
 
             reqs = []
             if partitions is None:  # commit all partitions
-                partitions = self.offsets.keys()
+                partitions = list(self.offsets.keys())
 
+            log.info('Committing new offsets for %s, partitions %s',
+                     self.topic, partitions)
             for partition in partitions:
                 offset = self.offsets[partition]
-                log.debug("Commit offset %d in SimpleConsumer: "
-                          "group=%s, topic=%s, partition=%s" %
-                          (offset, self.group, self.topic, partition))
+                log.debug('Commit offset %d in SimpleConsumer: '
+                          'group=%s, topic=%s, partition=%s',
+                          offset, self.group, self.topic, partition)
 
                 reqs.append(OffsetCommitRequest(self.topic, partition,
                                                 offset, None))
 
-            resps = self.client.send_offset_commit_request(self.group, reqs)
-            for resp in resps:
-                kafka.common.check_error(resp)
-
+            try:
+                self.client.send_offset_commit_request(self.group, reqs)
+            except KafkaError as e:
+                log.error('%s saving offsets: %s', e.__class__.__name__, e)
+                return False
+            else:
                 self.count_since_commit = 0
+                return True
 
     def _auto_commit(self):
         """