JVM - "JOURNAL_FLUSHER“警告是什么意思？

Question

我正在运行一个应用程序，一段时间后，日志将显示出来

15:31:41 [WARN] [15:31:41.002] [JOURNAL_FLUSHER] WARNING Journal flush operation took 3,678ms last 8 cycles average is 459ms
15:33:53 [WARN] [15:33:43.878] [JOURNAL_FLUSHER] WARNING Journal flush operation took 4,872ms last 8 cycles average is 609ms
15:34:48 [WARN] [15:34:40.084] [JOURNAL_FLUSHER] WARNING Journal flush operation took 4,941ms last 8 cycles average is 772ms
15:35:13 [WARN] [15:35:13.051] [JOURNAL_FLUSHER] WARNING Journal flush operation took 12,299ms last 8 cycles average is 2,306ms
15:38:19 [WARN] [15:38:13.718] [JOURNAL_FLUSHER] WARNING Journal flush operation took 2,366ms last 8 cycles average is 295ms
15:39:01 [WARN] [15:38:53.897] [JOURNAL_FLUSHER] WARNING Journal flush operation took 8,651ms last 8 cycles average is 1,377ms

这到底是什么意思？一段时间后，应用程序停止并抛出堆空间错误。这是否意味着我必须增加堆大小或permgen大小？我的应用程序在另一台计算机上运行得很好，但是在这台计算机上它会变得指数级的慢。我并不是在问如何解决这个问题，而是问这个警告意味着什么。

Answer 1

JOURNAL_FLUSHER线程负责将日志缓冲区写入磁盘。这些日志意味着磁盘性能可能存在问题。您的平台(OS)和JVM设置是什么？要完全解决您的问题，需要更详细的信息。