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Backport high disk utilization fix#9206

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jwilder merged 7 commits into1.4influxdata/influxdb:1.4from jw-14-backportinfluxdata/influxdb:jw-14-backportCopy head branch name to clipboardDec 7, 2017

+98-31

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Commits on Dec 7, 2017

• Switch O_SYNC to periodic fsync

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• Increase cache-snapshot-memory-size default

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• Cap concurrent compactions when large number of cores exists

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• Schedule compactions less aggressively

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• Use disk based TSM index more selectively

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• Update changelog

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• Fixup changelog

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