hbase-regionserver重启

hbase写入慢：

1.region在合并

2.gc时间

3.内存不足

regionserver重启后加载很慢

日志：

2018-12-18 11:22:03,817 INFO  [LruBlockCacheStatsExecutor] hfile.LruBlockCache: totalSize=19.24 MB, freeSize=18.31 GB, max=18.33 GB, blockCount=0, accesses=92919, hits=1, hitRatio=0.00%, , cachingAccesses=2, cachingHits=0, cachingHitsRatio=0,evictions=89, evicted=2, evictedPerRun=0.02247191034257412
2018-12-18 11:26:41,175 INFO  [HBase-Metrics2-1] impl.MetricsSystemImpl: Stopping HBase metrics system...
2018-12-18 11:26:41,179 INFO  [timeline] impl.MetricsSinkAdapter: timeline thread interrupted.
2018-12-18 11:26:41,182 INFO  [HBase-Metrics2-1] impl.MetricsSystemImpl: HBase metrics system stopped.
2018-12-18 11:26:41,182 INFO  [pool-493-thread-1] timeline.HadoopTimelineMetricsSink: Closing HadoopTimelineMetricSink. Flushing metrics to collector...
2018-12-18 11:26:41,683 INFO  [HBase-Metrics2-1] impl.MetricsConfig: loaded properties from hadoop-metrics2-hbase.properties
2018-12-18 11:26:41,690 INFO  [HBase-Metrics2-1] timeline.HadoopTimelineMetricsSink: Initializing Timeline metrics sink.

1.怀疑BlockBucket正在清理对象

2.过段时间后回复正常