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de1679b1b9
Previously, hinted handoff had a hardcoded concurrency limit - at most 128 hints could be sent from a single shard at once. This commit makes this limit configurable by adding a new configuration option: `max_hinted_handoff_concurrency_per_shard`. This option can be updated in runtime. Additionally, the default concurrency per shard is made lower and is now 8. The motivation for reducing the concurrency was to mitigate the negative impact hints may have on performance of the receiving node due to them not being properly isolated with respect to I/O. Tests: - unit(dev) - dtest(hintedhandoff_additional_test.py) Refs: #8624 Closes #8646