Improve the file read after invoking seek method

Description

Seek method in FileInStream always will release file instance and destroy the mmap byte-buffer and reopen them when read data.We can keep the block file instance and check the boundary of mmap byte-buffer in packet when invoking seek method.

Environment

None

Status

Assignee

Sean

Reporter

Sean

Labels

None

Components

Fix versions

Affects versions

1.6.1

Priority

Minor
Configure