4215 The log was not truncated because records at the beginning of the log

备份时报错

The log was not truncated because records at the beginning of the log are pending replication. Ensure the Log Reader Agent is running or use sp_repldone to mark transactions as distributed.
查找了下问题
用了以下脚本解决
--run 
sp_replicationdboption 'datayesdb','publish','true'
--then run sp_repldone with the following parameter
EXEC sp_repldone @xactid = NULL, @xact_segno = NULL, @numtrans = 0,    @time = 0, @reset = 1
--then unpublish the database
sp_replicationdboption 'datayesdb','publish','false'
--Run
dbcc traceon(3604)
dbcc opentran --- against the database to ensure there are no replicated transactions.
--the following scripts will show the detail sql script for the session
use master
declare @spid int;
declare @sql_handle binary(20);
set @spid = 601
SELECT @sql_handle = sql_handle
FROM sysprocesses As A with (nolock)
where spid = @spid
select text
from ::fn_get_sql(@sql_handle)
 USE [datayesdb]
GO
DBCC SHRINKFILE (N'datayesdb_log' , 0)
GO

参考
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/c96f3cb4-5f4e-49a4-a84a-6e2cd46915a3/the-log-was-not-truncated-because-records-at-the-beginning-of-the-log-are-pending-replication?forum=sqlreplication
please notice the following related issue 
Another connection is already running 'sp_replcmds' for Change Data Capture in the current database.
will be occure if you not run the sp_replflush after you cleanup the log file and you need to enable the cdc captupre
for detail info you can refer the following website
http://www.midnightdba.com/DBARant/another-connection-is-already-running-sp_replcmds-for-change-data-capture-in-the-current-database/