KPL Native Process Memory Leak

[kaaphi]

It appears that 0.14.3 introduced a memory leak in the native process.

See this graph of the KPL native process memory usage:

The top two lines are 0.14.3 and 0.15.6. The bottom (flat) line is 0.14.2. These graphs are from three application instances that are identical except for the version of KPL they are using. This a test application whose only operation is to publish to a Kinesis stream in a loop. Eventually, the OS kills the native process and KPL has to restart it. In all three applications, the outstandingRecordsCount stays below 5000, so this does not appear to be back-pressure related.

These are running in ECS with the amazoncorretto docker image on arm64.

It's possible that this is the same issue reported in #447 and #485.

[kaaphi]

This is looking much better in 0.15.7 (top line is 0.15.6, bottom line is 0.15.7):

I'm guessing this is due to the changes in PR #498.