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https://issues.apache.org/jira/browse/FLUME-3149?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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will zhang updated FLUME-3149:
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Description:
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 by storing
the offsets in event headers and passing it to my own "offsetMemoryChannel" and
store theses offsets in local disk 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
version. Thank you.
was:
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.
> 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
> by storing the offsets in event headers and passing it to my own
> "offsetMemoryChannel" and store theses offsets in local disk 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
> version. Thank you.
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