是什么导致了许多打开的文件问题？
java.io.ioexception:got error，状态消息opreadblock bp-493425312-172.20.178.11-1399995954120:blk\u 1449181880\u 375614544 received exception java.io.filenotfoundexception:/hd\u data/disk4/hadoop/hdfs/data/current/bp-493425312-172.20.178.11-1399995954120/current/finalized/subdir96/subdir194/blk\u 1449181880（打开的文件太多），对于op\u read\u块，self=/172.20.178.55:39870，remote=am1plccmrhdd05.r1 core.r1.aig.net/172.20.178.105:1019，对于文件/consumer/lhd/americas/policy\ u admin/alip/inset/pending\ u workload/rd\ u ascii\ u print.tsv，对于池bp-493425312-172.20.178.11-1399995954120 block 1449181880\ u 375614544