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77a0f1a153
When there are hint files to be sent and the target endpoint is DOWN, end_point_hints_manager works in the following loop: - It reads the first hint file in the queue, - For each hint in the file it decides that it won't be sent because the target endpoint is DOWN, - After realizing that there are some unsent hints, it decides to retry this operation after sleeping 1 second. This causes the first segment to be wholly read over and over again, with 1 second pauses, until the target endpoint becomes UP or leaves the cluster. This causes unnecessary I/O load in the streaming scheduling group. This patch adds a check which prevents end_point_hints_manager from reading the first hint file at all when it is not allowed to send hints. First observed in #6964 Tests: - unit(dev) - hinted handoff dtests Closes #7407