Mark Payne created NIFI-4775:
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Summary: Allow FlowFile Repository to optionally perform fsync
when writing CREATE events but not other events
Key: NIFI-4775
URL: https://issues.apache.org/jira/browse/NIFI-4775
Project: Apache NiFi
Issue Type: Improvement
Components: Core Framework
Reporter: Mark Payne
Currently, when a FlowFile is written to the FlowFile Repository, the repo can
either fsync or not, depending on nifi.properties. We should allow a third
option, of fsync only for CREATE events. In this case, if we receive new data
from a source we can fsync the update to the FlowFile Repository before ACK'ing
the data from the source. This allows us to guarantee data persistence without
the overhead of an fsync for every FlowFile Repository update.
It may make sense, though, to be a bit more selective about when do this. For
example if the source is a system that does not allow us to acknowledge the
receipt of data, such as a ListenUDP processor, this doesn't really buy us
much. In such a case, we could be smart about avoiding the high cost of an
fsync. However, for something like GetSFTP where we have to remove the file in
order to 'acknowledge receipt' we can ensure that we wait for the fsync before
proceeding.
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