hbase1.3.1 regionserver use bucketcache memory leak

hbase  use  bucketcache,   regionserver  process  have a large number of handles not deleted。 keep  Growing,  and   memory is  growing 。

  $ ll|grep deleted
lr-x------ 1 data data 64 Jan 28 14:28 1026 -> /block7/hadoop/dfs/data/current/BP-1101579887-10.50.64.23-1497104043858/current/finalized/subdir247/subdir97/blk_3036111274 (deleted)
lr-x------ 1 data data 64 Jan 28 14:28 1048 -> /block4/hadoop/dfs/data/current/BP-1101579887-10.50.64.23-1497104043858/current/finalized/subdir247/subdir216/blk_3036141819 (deleted)
lr-x------ 1 data data 64 Jan 28 14:28 1050 -> /block4/hadoop/dfs/data/current/BP-1101579887-10.50.64.23-1497104043858/current/finalized/subdir247/subdir216/blk_3036141819_1962457009.meta (deleted)
lr-x------ 1 data data 64 Jan 28 14:28 1063 -> /block10/hadoop/dfs/data/current/BP-1101579887-10.50.64.23-1497104043858/current/finalized/subdir247/subdir96/blk_3036111055 (deleted)
lr-x------ 1 data data 64 Jan 28 14:28 1066 -> /block8/hadoop/dfs/data/current/BP-1101579887-10.50.64.23-1497104043858/current/finalized/subdir247/subdir93/blk_3036110132 (deleted)
lr-x------ 1 data data 64 Jan 28 14:28 1078 -> /block5/hadoop/dfs/data/current/BP-1101579887-10.50.64.23-1497104043858/current/finalized/subdir247/subdir62/blk_3036102314 (deleted)
lr-x------ 1 data data 64 Jan 28 14:28 1079 -> /block7/hadoop/dfs/data/current/BP-1101579887-10.50.64.23-1497104043858/current/finalized/subdir247/subdir95/blk_3036110832 (deleted)
lr-x------ 1 data data 64 Jan 28 14:28 1080 -> /block8/hadoop/dfs/data/current/BP-1101579887-10.50.64.23-1497104043858/current/finalized/subdir247/subdir93/blk_3036110132_1962425322.meta (deleted)
lr-x------ 1 data data 64 Jan 28 14:28 1084 -> /block10/hadoop/dfs/data/current/BP-1101579887-10.50.64.23-1497104043858/current/finalized/subdir247/subdir96/blk_3036111055_1962426245.meta (deleted)
lr-x------ 1 data data 64 Jan 28 14:28 1091 -> /block3/hadoop/dfs/data/current/BP-1101579887-10.50.64.23-1497104043858/current/finalized/subdir245/subdir53/blk_3035968976_1962284166.meta (deleted)
lr-x------ 1 data data 64 Jan 28 14:28 1092 -> /block9/hadoop/dfs/data/current/BP-1101579887-10.50.64.23-1497104043858/current/finalized/subdir247/subdir97/blk_3036111332 (deleted)
lr-x------ 1 data data 64 Jan 28 14:28 1093 -> /block9/hadoop/dfs/data/current/BP-1101579887-10.50.64.23-1497104043858/current/finalized/subdir247/subdir97/blk_3036111332_1962426522.meta (deleted)
lr-x------ 1 data data 64 Jan 28 14:28 1096 -> /block5/hadoop/dfs/data/current/BP-1101579887-10.50.64.23-1497104043858/current/finalized/subdir247/subdir62/blk_3036102314_1962417504.meta (deleted)