kafka deleted old logs but not released

Hi,

We use kafka_2.10-0.8.1.1 in our server. Today we found disk space alert.

We find many kafka data files are deleted, but still opened by kafka.

such as:

_yellowpageV2-0/00000000000068170670.log (deleted)
java 8446 root 724u REG 253,2 536937911
26087362
/home/work/data/soft/kafka-0.8/data/_oakbay_v2_search_topic_ypgsearch_yellowpageV2-0/00000000000068818668.log
(deleted)
java 8446 root 725u REG 253,2 536910838
26087364
/home/work/data/soft/kafka-0.8/data/_oakbay_v2_search_topic_ypgsearch_yellowpageV2-0/00000000000069457098.log
(deleted)
java 8446 root 726u REG 253,2 536917902
26087368
/home/work/data/soft/kafka-0.8/data/_oakbay_v2_search_topic_ypgsearch_yellowpageV2-0/00000000000070104914.log
(deleted)

Is there anything wrong or wrong configed?