Master binlog Dump hang with status: Finished reading one binlog; switching to next binlog NULL (1 reply)

we have 5.5.39-enterprise-commercial-advanced-log, running on redhat7, with SSD, and qps around 7000/s, and tps around 400/s, having 30 slaves pointing to same master.

As some peak time, we have all slave day for about 50minutes, and we check master show processlist, no out-standing locks, cpu/io/network are not very high, and just as normal. but we around 10 binlog generated in master, and waiting to transfer to slave, what's the reason?


77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12576308 Finished reading one binlog; switching to next binlog NULL
77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12576908 Finished reading one binlog; switching to next binlog NULL
77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12577508 Finished reading one binlog; switching to next binlog NULL
77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12578108 Finished reading one binlog; switching to next binlog NULL
77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12578708 Finished reading one binlog; switching to next binlog NULL
77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12579308 Finished reading one binlog; switching to next binlog NULL
77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12579908 Finished reading one binlog; switching to next binlog NULL
77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12580508 Finished reading one binlog; switching to next binlog NULL
77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12581108 Finished reading one binlog; switching to next binlog NULL
77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12581708 Finished reading one binlog; switching to next binlog NULL
77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12582308 Finished reading one binlog; switching to next binlog NULL
77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12582908 Finished reading one binlog; switching to next binlog NULL
77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12583508 Finished reading one binlog; switching to next binlog NULL
77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12584108 Finished reading one binlog; switching to next binlog NULL
77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12584708 Finished reading one binlog; switching to next binlog NULL
77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12585308 Finished reading one binlog; switching to next binlog NULL
77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12595508 Finished reading one binlog; switching to next binlog NULL
77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12596108 Finished reading one binlog; switching to next binlog NULL
77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12596708 Finished reading one binlog; switching to next binlog NULL
77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12597308 Finished reading one binlog; switching to next binlog NULL
77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12597908 Finished reading one binlog; switching to next binlog NULL
77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12599108 Finished reading one binlog; switching to next binlog NULL
77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12599708 Finished reading one binlog; switching to next binlog NULL
77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12604508 Finished reading one binlog; switching to next binlog NULL
77 slave Search02.xxxx.net:40527 NULL Binlog Dump 12606308 Finished reading one binlog; switching to next binlog NULL