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Apache doesn't return a Content-Length header for zero byte files. So we add a specific workaround for it. If it's not apache, we should still throw errors if that header is missing.
The original iteration value causes the rebalance test failure on some low level box.
Mogilefs only consider space balance when allocates new file. The behavior causes cpu and io hotspot on new add disks, and is significant for a busy cluster. This modification try to take a more acceptable balance between space and cpu/io utilization.
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Three improvements according to our production use experience: