[KAFKA-576] SimpleConsumer throws UnsupportedOperationException: empty.head

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.8.0
• Assignee: Yang Ye
• Reporter: John Fung
• Created: 16/Oct/12 17:54
• Updated: 24/Oct/12 14:21
• Resolved: 24/Oct/12 14:21

Description

• In this case, there are 15 log segment files in broker-1 data dir:

ls -l /tmp/kafka_server_1_logs/test_1-0/
total 240
rw-rr- 1 jfung eng 16 Oct 16 10:41 00000000000000000000.index
rw-rr- 1 jfung eng 10440 Oct 16 10:40 00000000000000000000.log
rw-rr- 1 jfung eng 8 Oct 16 10:41 00000000000000000020.index
rw-rr- 1 jfung eng 10440 Oct 16 10:40 00000000000000000020.log
. . .
rw-rr- 1 jfung eng 8 Oct 16 10:41 00000000000000000280.index
rw-rr- 1 jfung eng 10440 Oct 16 10:41 00000000000000000280.log

• The following are the dump log segment of the first log segment file

bin/kafka-run-class.sh kafka.tools.DumpLogSegments /tmp/kafka_server_1_logs/test_1-0/00000000000000000000.log
Dumping /tmp/kafka_server_1_logs/test_1-0/00000000000000000000.log
Starting offset: 0
offset: 0 isvalid: true payloadsize: 500 magic: 2 compresscodec: NoCompressionCodec crc: 1663889063
offset: 1 isvalid: true payloadsize: 500 magic: 2 compresscodec: NoCompressionCodec crc: 2803454828
offset: 2 isvalid: true payloadsize: 500 magic: 2 compresscodec: NoCompressionCodec crc: 683347625
. . .
offset: 18 isvalid: true payloadsize: 500 magic: 2 compresscodec: NoCompressionCodec crc: 1892511043
offset: 19 isvalid: true payloadsize: 500 magic: 2 compresscodec: NoCompressionCodec crc: 601297044

• Output of SimpleConsumerShell:
  . . .
  next offset = 16
  Topic:test_1:ThreadID:2:MessageID:0000000043:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  next offset = 17
  Topic:test_1:ThreadID:3:MessageID:0000000063:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  next offset = 18
  Topic:test_1:ThreadID:4:MessageID:0000000083:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  next offset = 19
  Topic:test_1:ThreadID:0:MessageID:0000000003:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  next offset = 19
  Topic:test_1:ThreadID:0:MessageID:0000000003:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  next offset = 19
  Topic:test_1:ThreadID:0:MessageID:0000000003:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  next offset = 19
  Topic:test_1:ThreadID:0:MessageID:0000000003:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  . . .

• It appears that SimpleConsumerShell doesn't advance to the next log segment file

• It should probably block inside the while loop to prevent infinite looping

Issue Links

• Is contained by: KAFKA-571 Add more test cases to System Test