when to release the raft_entry_data_t buf resource

[kevin-gjm]

Hi:
Thank you for this wonderful project!
I have a few questions about the entry log I don't quite understand.

typedef struct
{
    void *buf;

    unsigned int len;
} raft_entry_data_t;

int the raft.h use raft_entry_data_t store entry.when to release the buf ? ?
when to call the log_pop and log_poll (not have conflicting entries) ??
And if we use variable-length entry how to handle it ??