Ben Stopford created KAFKA-2908:
-----------------------------------
Summary: Instance of Gap in Consumption after Restart
Key: KAFKA-2908
URL: https://issues.apache.org/jira/browse/KAFKA-2908
Project: Kafka
Issue Type: Sub-task
Reporter: Ben Stopford
*Context:*
Instance of the rolling upgrade test. 10s sleeps have been put around node
restarts to ensure stability when subsequent nodes go down. Consumer timeout
has been set to 60s. Proudcer has been throttled to 100 messages per second.
Failure is rare: It occurred once in 60 executions (6 executions per run #276
-> #285 of the system_test_branch_builder)
*Reported Failure:*
At least one acked message did not appear in the consumed messages.
acked_minus_consumed: 16385, 16388, 16391, 16394, 16397, 16400, 16403, 16406,
16409, 16412, 16415, 16418, 16421, 16424, 16427, 16430, 16433, 16436, 16439,
16442, ...plus 1669 more
*Immediate Observations:*
* The list of messages not consumed are all in partition 1.
* The messages ARE present in the log file:
e.g.
{quote}
Examining missing value 16385. This was written to p1,offset:5453
=> there is an entry in all data files for partition 1 for this (presumably
meaning it was replicated correctly)
kafka/bin/kafka-run-class.sh kafka.tools.DumpLogSegments --files
worker10/kafka-data-logs/test_topic-1/00000000000000000000.log | grep 'offset:
5453'
worker10,9,8 repectively:
offset: 5453 position: 165346 isvalid: true payloadsize: 5 magic: 0
compresscodec: NoCompressionCodec crc: 1502953075
offset: 5453 position: 165346 isvalid: true payloadsize: 5 magic: 0
compresscodec: NoCompressionCodec crc: 1502953075
offset: 5453 position: 165346 isvalid: true payloadsize: 5 magic: 0
compresscodec: NoCompressionCodec crc: 1502953075
{quote}
These entries definitely do not appear in the consumer stdout file either.
*Timeline:*
{quote}
15:27:02,232 - Producer sends first message
..servers 1, 2 are restarted (clean shutdown)
15:29:42,718 - Server 3 shutdown complete
15:29:42,712 - (Controller fails over): Broker 2 starting become controller
state transition (kafka.controller.KafkaController)
15:29:42,743 - New leasder is 2 (LeaderChangeListner)
15:29:43,239 - WARN Broker 2 ignoring LeaderAndIsr request from controller 2
with correlation id 0 epoch 7 for partition (test_topic,1) since its associated
leader epoch 8 is old. Current leader epoch is 8 (state.change.logger)
15:29:45,642 - Producer starts writing messages that are never consumed
15:30:10,804 - Last message sent by producer
15:31:10,983 - Consumer times out after 60s wait without messages
{quote}
Logs for this run are attached
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