[HADOOP-4434] Improve log rotation and reduce communication between agent and logging process, make agent more fault tolerant

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Duplicate

Environment

Redhat Enterprise Linux 4.5, Java 6

• Hadoop Flags: Incompatible change, Reviewed

Release Note

- Added returning of adaptor id when processing a command.
- Added test case to make sure adaptor can be started correctly.
- Added test case for Start streaming data in the middle of the file.
- Changed adaptor interface to remember stream name.
- Added logic to check for existing data stream and prevent the same data stream being added twice.
- Increased maximum post size to 2MB.

• Assignee: Eric Yang
• Reporter: Eric Yang
• Created: 16/Oct/08 21:45
• Updated: 02/May/13 02:29
• Resolved: 30/Nov/08 08:22

Description

• Chukwa Agent does not handle rotated log correctly. The current design requires the logging process to pause the agent, rotate the log, then resume the log streaming. The three communication between the running process and chukwa agent could become a problem when either or one of the process is down. The implementation should be able to detect log rotation in the chukwa agent.
• Chukwa Agent should detect and prevent the same log being streamed more than once.
• Chukwa Agent should synchronize data streaming addition when picking up the check point file.

Issue Links

• depends upon: HADOOP-4529 Support CHUKWA_CONF_DIR environment property for configuration storage
• is duplicated by: HADOOP-4527 Add detection to duplicated data stream
• is part of: HADOOP-4709 Update chukwa source code and develop chukwa from public repository