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Decrease default flow control buffer size from 128 MB to 16 MB

Description

The current default of 128 MB can easily lead to OutOfMemoryErrors when there are multiple Couchbase nodes, since there's one buffer per DCP connection.
Let's dial this down to 16 MB, which should dramatically limit memory usage while still giving good performance.

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Instabug

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Zendesk Support

Created October 18, 2021 at 7:31 PM
Updated October 18, 2021 at 7:35 PM
Resolved October 18, 2021 at 7:35 PM
Instabug