Flume rollback during restart possible?

[Robert B Hamilton <ro...@gm.com>]

Hello all. I have an interesting case where we lose data in the event of a flume crash, which is easily reproducible when we kill -9  the flume agent.

 I believe that this may be because the Flume Sink is issuing a commit before it actually completes the fs sync.  If this is the case then the last few commits just before the crash would have removed events from the queue even though those events will needed to perform a recovery.  My question is, are those events still possibly in the WAL? If so, is it possible so somehow roll back the queue to a point in time before the commits were processed, and restart from that state? How would I accomplish this?






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