???????????

????1. Flash/SSD???cache??á?

???????濼?????????????????????????Facebook??HBase?????Node??15??100MB/s?????10ms??????????Figure 9??????a)???????????е???;b)????????????????;c)??????????????á?

??????????????????????????????????????????cache?????80%???????????????????????????I/O?????????????????hot data?????cache?????????????洢??????cache???Figure 11?????????????Flash?????????棬cache?????????????????cache???????????С?????????

?????????????Flash/SSD??cache??????ο?HBase BucketBlockCache(HBASE-7404)

???????????????????Flash/SSD????????????????Flash??shuffling????????????????????????????У??????????????????????Flash?????????????????????????????????????????????С??