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## `FLUSH_BLOCK_SECONDS`

Option | `FLUSH_BLOCK_SECONDS`
Description | How long a mini-segment can stay open
Default | `900 seconds`

How long a mini-segment can stay open. How much data needs replay from Kafka when a fail-over happens. More flushing means minisegments are likely to be smaller. Less frequent flushing means more replay in the event of a crash. See `BLOCKS_PER_SEGMENT` for an example of this variable and more information.

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