[root@test log]# tail -f 100 /var/log/mysqld.log
2020-09-08T09:00:46.639970Z 244 [Warning] InnoDB: Difficult to find free blocks in the buffer pool (1186065 search iterations)! 1186065 failed attempts to flush a page! Consider increasing the buffer pool size. It is also possible that in your Unix version fsync is very slow, or completely frozen inside the OS kernel. Then upgrading to a newer version of your operating system may help. Look at the number of fsyncs in diagnostic info below. Pending flushes (fsync) log: 0; buffer pool: 0. 99134549 OS file reads, 3547773 OS file writes, 687230 OS fsyncs. Starting InnoDB Monitor to print further diagnostics to the standard output.
2020-09-08T09:00:46.641107Z 248 [Warning] InnoDB: Difficult to find free blocks in the buffer pool (1166575 search iterations)! 1166575 failed attempts to flush a page! Consider increasing the buffer pool size. It is also possible that in your Unix version fsync is very slow, or completely frozen inside the OS kernel. Then upgrading to a newer version of your operating system may help. Look at the number of fsyncs in diagnostic info below. Pending flushes (fsync) log: 0; buffer pool: 0. 99134549 OS file reads, 3547773 OS file writes, 687230 OS fsyncs. Starting InnoDB Monitor to print further diagnostics to the standard output.