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From Niels Basjes <Ni...@basjes.nl>
Subject Periodic flush sink?
Date Sat, 29 Apr 2017 14:32:38 GMT

I have a sink that writes my records into HBase.

The data stream is attached to measurements from an internal testing
instance of the website.
As a consequence there are periods of really high load (someone is doing a
load test) and really low load (only a hand full of people are testing

I read the records from Kafka and I want to write the records into HBase.
Because under high load it is more efficient to buffer the writes between
the client and the server and as indicated by HBase I use a BufferedMutator.

This BufferedMutator works with a 'fixed size' buffer and under high load
setting it to a few MiB improves the performance writing to HBase greatly.
However under low load you have to wait until the buffer is full and that
can be a LONG time (hours) when the load is really low.

I want to fire a periodic event into my sink to ensure I get a flush of the
buffers atleast every few seconds.

Simply implement a standard Java  TimerTask and fire that using a Timer?
Or is there a better way of doing that in Flink?

Best regards / Met vriendelijke groeten,

Niels Basjes

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