On 06/04/18 22:10, dharmon wrote: > environment: > tomcat 8.5.23 > CentOS 6.9 > jdk8u162 b12 > > I recently upgraded from tomcat 7.0.61/jdk8u92 to tomcat 8.5.23/jdk8u162. > Our application war file on tomcat7 has cpu >75% idle per vmstat several > hours after tomcat start. Same war file on same server with tomcat8.5.23 has > cpu 0% idle per vmstat several hours after restart. Same server with similar > request load. Server has 4 CPUs. War file processes https REST web service > requests. > > I used jvisualvm to perform CPU profiling and the method with most self time > is org.apache.tomcat.util.buf.Utf8Decoder.decodeHasArray. jstack shows there > are 12 https-jsse-nio-8443-exec-### threads always in runnable state[1]. > They have been in this state for several hours. It appears as if it's stuck > in infinite loop. Using the thread's nid and lsof, I believe the tcp/https > connection associated with these threads are no longer > connected/established. > > Any known issues that could be causing this problem? I also tried using the > NIO2 connector with same issue.
None I am aware of. I wouldn't expect the connector to make any difference. > I'm on a closed network, thus unable to show jvisualvm screen shots or > verbose stack traces. I've taken a good look at the relevant code and nothing immediately jumps out as a potential cause of this. It sounds as if this is fairly easy to reproduce so I would suggest configuring your Tomcat instance to support remote debugging and when it happens again step through the relevant code to see why /exactly where it is looping. The aim is to provide us with enough information to ideally reproduce it but - as a minimum - provide an explanation that can be used to support a change to fix it. Mark > > > [1] > java.lang.Thread.State: RUNNABLE > at > org.apache.tomcat.util.buf.Utf8Decoder.decodeHasArray(Utf8Decoder.java:159) > at org.apache.tomcat.util.buf.Utf8Decoder.decodeLoop(Utf8Decoder.java:78) > at java.nio.charset.CharsetDecoder.decode(CharsetDecoder.java:579) > at org.apache.tomcat.util.buf.B2CConverter.convert(B2CConverter.java:273) > at > org.apache.catalina.connector.InputBuffer.realReadChars(InputBuffer.java:426) > at > org.apache.catalina.connector.InputBuffer.checkCharBufferEof(InputBuffer.java:652) > at org.apache.catalina.connector.InputBuffer.read(InputBuffer.java:468) > at org.apache.catalina.connector.CoyoteReader.read(CoyoteReader.java:101) > <groovy classes> > <my application code with is attempting to read http request> > > > > > > > -- > Sent from: http://tomcat.10.x6.nabble.com/Tomcat-User-f1968778.html > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
