This is known and fixed in 5.2. On Thu, Sep 22, 2011 at 3:36 AM, Jens Breitenstein <mailingl...@j-b-s.de> wrote: > Hi All! > > It seems we encountered a serious concurrency bug in Tapestry 5.1> under > high load. > In our special case one thread was blocked and unable to respond and write > an asset output stream. > As virtual assets are shared and the same ByteArrayOutputStream is reused > for the same asset accross multiple threads, the one thread hanging causes > all other threads which use the same asset to be blocked too. This happens > because ByteArrayOutputStream.writeTo uses synchronized internally. To our > personal opinion we should only cache the data but not the > ByteArrayOutputStream instances. > > Any idea how to solve this or am I wrong? > > Jens > > > > Dump of the locking monitor: > "TP-Processor241" daemon prio=10 tid=0x00002aab15451000 nid=0x7a87 runnable > [0x000000004fd70000] > java.lang.Thread.State: RUNNABLE > at java.net.SocketOutputStream.socketWrite0(Native Method) > at > java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92) > at java.net.SocketOutputStream.write(SocketOutputStream.java:136) > at org.apache.jk.common.ChannelSocket.send(ChannelSocket.java:532) > at org.apache.jk.common.JkInputStream.doWrite(JkInputStream.java:162) > at org.apache.coyote.Response.doWrite(Response.java:560) > at > org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:353) > at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:354) > at > org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:381) > at > org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:370) > at > org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:89) > at > java.io.ByteArrayOutputStream.writeTo(ByteArrayOutputStream.java:109) > - locked<0x00002aaac0ab5e08> <monitor://%3C0x00002aaac0ab5e08%3E> > (a java.io.ByteArrayOutputStream) > at > org.apache.tapestry5.internal.services.VirtualAssetStreamerImpl.streamVirtualAsset(VirtualAssetStreamerImpl.java:96) > at > $VirtualAssetStreamer_132873471df.streamVirtualAsset($VirtualAssetStreamer_132873471df.java) > at > org.apache.tapestry5.internal.services.VirtualAssetDispatcher.dispatch(VirtualAssetDispatcher.java:49) > at $Dispatcher_132873471e5.dispatch($Dispatcher_132873471e5.java) > at $Dispatcher_132873471d7.dispatch($Dispatcher_132873471d7.java) > at > org.apache.tapestry5.services.TapestryModule$RequestHandlerTerminator.service(TapestryModule.java:245) > at > ae.sukar.client.http.services.ShopModule$3.service(ShopModule.java:175) > > Dump of one of the locked monitors: > "TP-Processor223" daemon prio=10 tid=0x00002aab157f0000 nid=0x7a11 waiting > for monitor entry [0x000000004eb5e000] > java.lang.Thread.State: BLOCKED (on object monitor) > at java.io.ByteArrayOutputStream.size(ByteArrayOutputStream.java:144) > - waiting to lock<0x00002aaac0ab5e08> > <monitor://%3C0x00002aaac0ab5e08%3E> (a java.io.ByteArrayOutputStream) > at > org.apache.tapestry5.internal.services.VirtualAssetStreamerImpl.streamVirtualAsset(VirtualAssetStreamerImpl.java:84) > at > $VirtualAssetStreamer_132873471df.streamVirtualAsset($VirtualAssetStreamer_132873471df.java) > at > org.apache.tapestry5.internal.services.VirtualAssetDispatcher.dispatch(VirtualAssetDispatcher.java:49) > at $Dispatcher_132873471e5.dispatch($Dispatcher_132873471e5.java) > at $Dispatcher_132873471d7.dispatch($Dispatcher_132873471d7.java) > at > org.apache.tapestry5.services.TapestryModule$RequestHandlerTerminator.service(TapestryModule.java:245) > at > ae.sukar.client.http.services.ShopModule$3.service(ShopModule.java:175) > at > $RequestHandler_132873471d8.service($RequestHandler_132873471d8.java) > at > nu.localhost.tapestry5.springsecurity.services.internal.RequestFilterWrapper$1.doFilter(RequestFilterWrapper.java:60) > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tapestry.apache.org > For additional commands, e-mail: users-h...@tapestry.apache.org > >
-- Howard M. Lewis Ship Creator of Apache Tapestry The source for Tapestry training, mentoring and support. Contact me to learn how I can get you up and productive in Tapestry fast! (971) 678-5210 http://howardlewisship.com --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tapestry.apache.org For additional commands, e-mail: users-h...@tapestry.apache.org
