[
https://issues.apache.org/jira/browse/FLUME-3149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16144789#comment-16144789
]
will zhang commented on FLUME-3149:
-----------------------------------
Hi [~bessbd],
Thank you for your clarification.
Right now, I can't think of a way to separate them cause the key of my idea is
to let the channel inform the source when to actually commit. However, the
current design of flume to decouple them.
I can move the channel's part of "writePos" to source side but the source still
needs to know when the channel commits.
I'll keep working on it and update if any progress made.
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.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
