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Write Buffers

Sentry manages database row contention by buffering writes and flushing bulk changes to the database over a period of time. This is extremely helpful if you have high concurrency, especially if they’re frequently the same event.

For example, if you happen to receive 100,000 events/second, and 10% of those are reporting a connection issue to the database (where they’d get grouped together), enabling a buffer backend will change things so that each count update is actually put into a queue, and all updates are performed at the rate of how fast the queue can keep up.

Configuration

To specify a backend, simply modify the SENTRY_BUFFER and SENTRY_BUFFER_OPTIONS values in your configuration:

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SENTRY_BUFFER = 'sentry.buffer.base.Buffer'

Redis

Configuring the Redis backend requires the queue or you won’t see any gains (in fact you’ll just negatively impact your performance).

Configuration is straight forward:

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SENTRY_BUFFER = 'sentry.buffer.redis.RedisBuffer'

By default, this will use the default named Redis cluster. To use a different cluster, provide the cluster option, as such:

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SENTRY_BUFFER_OPTIONS = {
    'cluster': 'buffer',
}
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