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Currently the max size of each WAL entry is hard coded as 10MB. If users set a value > 10MB for the flag --max-request-bytes, then etcd may run into a situation that it successfully processes a big request, but fails to decode it when replaying the WAL file on startup. On the other hand, we can't just remove the limitation, because if a WAL entry is somehow corrupted, and its recByte is a huge value, then etcd may run out of memory. So the solution is to restrict the max size of each WAL entry as a dynamic value, which is the remaining size of the WAL file. Signed-off-by: Benjamin Wang <wachao@vmware.com>