Bugfixes

• Avoid multiple connection attempts when refreshing metadata (dpkp #1067)
• Catch socket.errors when sending / recving bytes on wake socketpair (dpkp #1069)
• Deal with brokers that reappear with different IP address (originsmike #1085)
• Fix join-time-max and sync-time-max metrics to use Max() measure function (billyevans #1146)
• Raise AssertionError when decompression unsupported (bts-webber #1159)
• Catch ssl.EOFErrors on Python3.3 so we close the failing conn (Ormod #1162)
• Select on sockets to avoid busy polling during bootstrap (dpkp #1175)
• Initialize metadata_snapshot in group coordinator to avoid unnecessary rebalance (dpkp #1174)

Client

• Timeout idle connections via connections_max_idle_ms (dpkp #1068)
• Warn, dont raise, on DNS lookup failures (dpkp #1091)
• Support exponential backoff for broker reconnections -- KIP-144 (dpkp #1124)
• Add gssapi support (Kerberos) for SASL (Harald-Berghoff #1152)
• Add private map of api key -> min/max versions to BrokerConnection (dpkp #1169)

Consumer

• Backoff on unavailable group coordinator retry (dpkp #1125)
• Only change_subscription on pattern subscription when topics change (Artimi #1132)
• Add offsets_for_times, beginning_offsets and end_offsets APIs (tvoinarovskyi #1161)

Producer

• Raise KafkaTimeoutError when flush times out (infecto)
• Set producer atexit timeout to 0 to match del (Ormod #1126)

Core / Protocol

• 0.11.0.0 protocol updates (only - no client support yet) (dpkp #1127)
• Make UnknownTopicOrPartitionError retriable error (tvoinarovskyi)

Test Infrastructure

• pylint 1.7.0+ supports python 3.6 and merge py36 into common testenv (jianbin-wei #1095)
• Add kafka 0.10.2.1 into integration testing version (jianbin-wei #1096)
• Disable automated tests for python 2.6 and kafka 0.8.0 and 0.8.1.1 (jianbin-wei #1096)
• Support manual py26 testing; dont advertise 3.3 support (dpkp)
• Add 0.11.0.0 server resources, fix tests for 0.11 brokers (dpkp)
• Use fixture hostname, dont assume localhost (dpkp)
• Add 0.11.0.0 to travis test matrix, remove 0.10.1.1; use scala 2.11 artifacts (dpkp #1176)

Logging / Error Messages

• Improve error message when expiring batches in KafkaProducer (dpkp #1077)
• Update producer.send docstring -- raises KafkaTimeoutError (infecto)
• Use logging's built-in string interpolation (jeffwidman)
• Fix produce timeout message (melor #1151)
• Fix producer batch expiry messages to use seconds (dnwe)

Documentation

• Fix typo in KafkaClient docstring (jeffwidman #1054)
• Update README: Prefer python-lz4 over lz4tools (kiri11 #1057)
• Fix poll() hyperlink in KafkaClient (jeffwidman)
• Update RTD links with https / .io (jeffwidman #1074)
• Describe consumer thread-safety (ecksun)
• Fix typo in consumer integration test (jeffwidman)
• Note max_in_flight_requests_per_connection > 1 may change order of messages (tvoinarovskyi #1149)