core_output_filter：由於 FLUSH 儲存桶而刷新 - 為什麼我在 Apache 錯誤日誌中看到這個？

有誰知道為什麼我總是core_output_filter: flushing because of FLUSH bucket在我的 Apache 2.4.7 (Ubuntu) 錯誤日誌中看到它，這是什麼意思？

到目前為止我還沒有發現任何問題，但這確實使我對error.log. 日誌一直是這樣的：

   [Mon Apr 23 09:22:34.927673 2018] [core:trace6] [pid 6096] core_filters.c(527): [client 127.0.0.1:40876] core_output_filter: flushing because of FLUSH bucket
   [Mon Apr 23 09:22:34.927793 2018] [core:trace6] [pid 6159] core_filters.c(527): [client 127.0.0.1:40868] core_output_filter: flushing because of FLUSH bucket
   [Mon Apr 23 09:22:34.927892 2018] [core:trace6] [pid 6160] core_filters.c(527): [client 127.0.0.1:40870] core_output_filter: flushing because of FLUSH bucket
   [Mon Apr 23 09:22:35.160482 2018] [core:trace6] [pid 6092] core_filters.c(527): [client 127.0.0.1:40866] core_output_filter: flushing because of FLUSH bucket
   [Mon Apr 23 09:24:07.472559 2018] [core:trace5] [pid 6161] protocol.c(655): [client 127.0.0.1:40888] Request received from client: POST /index.php?module=000100 HTTP/1.1
   [Mon Apr 23 09:24:07.721570 2018] [core:trace6] [pid 6161] core_filters.c(527): [client 127.0.0.1:40888] core_output_filter: flushing because of FLUSH bucket
   [Mon Apr 23 09:24:12.725587 2018] [core:trace6] [pid 6161] core_filters.c(527): [client 127.0.0.1:40888] core_output_filter: flushing because of FLUSH bucket
   [Mon Apr 23 09:29:07.829907 2018] [core:trace5] [pid 6093] protocol.c(655): [client 127.0.0.1:41056] Request received from client: POST /index.php?module=000100 HTTP/1.1
   [Mon Apr 23 09:29:07.986466 2018] [core:trace6] [pid 6093] core_filters.c(527): [client 127.0.0.1:41056] core_output_filter: flushing because of FLUSH bucket
   [Mon Apr 23 09:29:12.990794 2018] [core:trace6] [pid 6093] core_filters.c(527): [client 127.0.0.1:41056] core_output_filter: flushing because of FLUSH bucket

所以，我正在回答我自己的問題，因為我發現了問題所在:)

Apache 虛擬主機配置LogLevel指令設置為trace6（實際上可以在日誌的每一行中看到：）[core:trace6]，這使得日誌非常詳細地說明了伺服器正在做什麼。

降低級別使錯誤日誌輸出變得更易讀。

有關 ApacheLogLevel指令的詳細資訊：Apache 2.4 LogLevel 文件

引用自：https://serverfault.com/questions/908961