开启Bigtable的TTL功能后，发现存储使用量显著下降，并伴随着磁盘I/O异常升高及HBase健康状态不佳等问题。通过监控工具定位问题发生的时间范围并检查HBase日志，发现了一系列警告信息。
yesteday after we turn the big table TTL on, it have a big storage usage down
openfalcon disk monitor show the disk io is high at the unhealthy time range
hbase region log show the time that unhealty with log warnings
CDH diagnostic page show hbase healthy not normal
check the hbase storage which data time range it has
aws monitor shows that disk read not normal after we turn ttl on
just raise the number threshold
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