TCP backlog引起的Tomcat客户端connect timeout
生产环境的Tomcat在Full GC时，部分客户端请求会有connect timeout报错，然而我们客户端设置的连接超时是10s，FullGC最长不过2s，一番搜索后发现是backlog的锅，在此记录一下backlog的工作原理
El Psy Congroo
Safepoint学习笔记
safepointSafepoints: Meaning, Side Effects and OverheadsCounted/Uncounted loops, Safepoints and OSR CompilationJVM的Stop The World，安全点，黑暗的地底世界 When at a safepoint, the thread’s representation of it’s
AAT读书笔记
AAT Rule for letter o In a one-syllable word, o sounds like ä (unless the word ends in e) hot, lost, Tom, Bob, dot com In a stressed syllable, o also sounds like ä possible, Holland, philosophy
Kafka学习笔记
概述Kafka本质上是一个append-only的日志系统，消息就是日志，按顺序追加到log文件中。为了能快速定位到消息，每个log文件还对应一个index文件，稀疏记录log文件中消息的offset，因此单个log文件也不能太大，log文件对应segment这个概念。为了提高并发性能，那就需要同时提供多组log文件以供写入，这就是topic中的partition概念，消息会hash到固定的par
Spark学习笔记
SparkRDD (Resilient Distributed Datasets) What is RDD RDDs are immutable, fault tolerant, parallel data structures that let users explicitly persist intermediate results in memory, control their part