will zhang created FLUME-3149:
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Summary: reduce cpu cost for file source transfer while still
maintaining reliability
Key: FLUME-3149
URL: https://issues.apache.org/jira/browse/FLUME-3149
Project: Flume
Issue Type: Improvement
Components: File Channel
Reporter: will zhang
File channel tracks transferred events and use transnational mechanism to make
transfer recoverable. However, it increases CPU cost due to frequent system
calls like write, read, etc. The Cpu cost could be very high if the transfer
rate is high. In contrast, Memory channel has no such issue which requires
only about 10% of CPU cost in the same environment but it's not recovered if
the system is down accidentally.
For sources like taildir/spooldir, I propose we could track offsets of file and
store them locally to achieve reliability while still using memory channel to
reduce CPU cost. Actually, I have already implemented this feature in our
production which reduces CPU cost by about 90 percent.
Please let me know if it's worthwhile to have this feature in community. Thank
you.
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