[Bug] auto_roll_logger memory leak

[yizhang2077]

Description

rocksdb/logging/auto_roll_logger.cc

Line 254 in 302254d

headers_.push_back(data);

Hi. In auto roll logger, I find there is no place to reset headers_ or pop headers_ elements which may cause memory leak and cause WriteHeaderInfo write larger and larger content as headers_ grows. I don't know if my understanding is correct.

Reproduction way

Create column family and drop this column family many times (like 3000 times), you may find LOG grow up very fast and consume most of bandwidth of disk and there are many useless information in LOG, which are caused by headers_