Hitting the /logText/progressiveText API of a completed build with very large log file ( XXX MB or X GB or more) exhaust the heap memory.
The Jetty thread handling it looks like this:
"Handling GET /job/testLog/5//logText/progressiveText from 127.0.0.1 : Jetty (winstone)-19" id=19 state=RUNNABLE
at java.base@17.0.8/java.util.zip.Deflater.deflateBufferBytes(Native Method)
at java.base@17.0.8/java.util.zip.Deflater.deflate(Deflater.java:751)
at Jenkins Main ClassLoader//org.eclipse.jetty.server.handler.gzip.GzipResponseAndCallback$GzipBufferCB.compressing(GzipResponseAndCallback.java:410)
at Jenkins Main ClassLoader//org.eclipse.jetty.server.handler.gzip.GzipResponseAndCallback$GzipBufferCB.process(GzipResponseAndCallback.java:370)
at Jenkins Main ClassLoader//org.eclipse.jetty.util.IteratingCallback.processing(IteratingCallback.java:262)
at Jenkins Main ClassLoader//org.eclipse.jetty.util.IteratingCallback.iterate(IteratingCallback.java:243)
at Jenkins Main ClassLoader//org.eclipse.jetty.server.handler.gzip.GzipResponseAndCallback.gzip(GzipResponseAndCallback.java:157)
at Jenkins Main ClassLoader//org.eclipse.jetty.server.handler.gzip.GzipResponseAndCallback.write(GzipResponseAndCallback.java:135)
at Jenkins Main ClassLoader//org.eclipse.jetty.server.Response$Wrapper.write(Response.java:768)
at Jenkins Main ClassLoader//org.eclipse.jetty.server.handler.ContextResponse.write(ContextResponse.java:56)
at Jenkins Main ClassLoader//org.eclipse.jetty.ee9.nested.HttpChannel.send(HttpChannel.java:1044)
at Jenkins Main ClassLoader//org.eclipse.jetty.ee9.nested.HttpChannel.sendResponse(HttpChannel.java:1028)
at Jenkins Main ClassLoader//org.eclipse.jetty.ee9.nested.HttpChannel.write(HttpChannel.java:1110)
at Jenkins Main ClassLoader//org.eclipse.jetty.ee9.nested.HttpOutput.channelWrite(HttpOutput.java:277)
at Jenkins Main ClassLoader//org.eclipse.jetty.ee9.nested.HttpOutput.channelWrite(HttpOutput.java:261)
at Jenkins Main ClassLoader//org.eclipse.jetty.ee9.nested.HttpOutput.write(HttpOutput.java:876)
at java.base@17.0.8/java.io.ByteArrayOutputStream.writeTo(ByteArrayOutputStream.java:161)
- locked org.eclipse.jetty.util.ByteArrayOutputStream2@5ff96858
at Jenkins Main ClassLoader//org.eclipse.jetty.io.WriteThroughWriter$Utf8Writer.append(WriteThroughWriter.java:335)
at Jenkins Main ClassLoader//org.eclipse.jetty.io.WriteThroughWriter.write(WriteThroughWriter.java:138)
at Jenkins Main ClassLoader//org.eclipse.jetty.ee9.nested.ResponseWriter.write(ResponseWriter.java:209)
- locked org.eclipse.jetty.io.WriteThroughWriter$Utf8Writer@4cb1d7cd
at org.springframework.security.web.util.OnCommittedResponseWrapper$SaveContextPrintWriter.write(OnCommittedResponseWrapper.java:314)
at java.base@17.0.8/java.io.FilterWriter.write(FilterWriter.java:83)
at org.kohsuke.stapler.framework.io.LineEndNormalizingWriter.write(LineEndNormalizingWriter.java:78)
at org.kohsuke.stapler.framework.io.LineEndNormalizingWriter.write(LineEndNormalizingWriter.java:51)
at org.kohsuke.stapler.framework.io.CharSpool.writeTo(CharSpool.java:86)
at org.kohsuke.stapler.framework.io.LargeText.doProgressTextImpl(LargeText.java:319)
at org.kohsuke.stapler.framework.io.LargeText.doProgressText(LargeText.java:274)
at hudson.console.AnnotatedLargeText.doProgressiveText(AnnotatedLargeText.java:128)
at java.base@17.0.8/java.lang.invoke.LambdaForm$DMH/0x000000013e120400.invokeVirtual(LambdaForm$DMH)
at java.base@17.0.8/java.lang.invoke.LambdaForm$MH/0x000000013ece2800.invoke(LambdaForm$MH)
at java.base@17.0.8/java.lang.invoke.LambdaForm$MH/0x000000013ec9dc00.invoke(LambdaForm$MH)
at java.base@17.0.8/java.lang.invoke.LambdaForm$MH/0x000000013ec9c000.invokeExact_MT(LambdaForm$MH)
at java.base@17.0.8/java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:732)
at org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:484)
at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:497)
at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:218)
at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:140)
at org.kohsuke.stapler.MetaClass$12.doDispatch(MetaClass.java:686)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:61)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:800)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:938)
at org.kohsuke.stapler.MetaClass$2.doDispatch(MetaClass.java:244)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:61)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:800)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:938)
at org.kohsuke.stapler.MetaClass$10.dispatch(MetaClass.java:590)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:800)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:938)
at org.kohsuke.stapler.MetaClass$5.doDispatch(MetaClass.java:369)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:61)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:800)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:938)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:721)
at org.kohsuke.stapler.Stapler.service(Stapler.java:253)
at Jenkins Main ClassLoader//jakarta.servlet.http.HttpServlet.service(HttpServlet.java:587)
at Jenkins Main ClassLoader//org.eclipse.jetty.ee9.servlet.ServletHolder.handle(ServletHolder.java:765)
On the other hand, the console output is not impacted by this and efficiently stream the logs.
The API documentation is not clear about how to stream the data should a REST Client want to do something similar:
Hi! from my debugging i found that the problem occurs in AnnotatedLargeText.java where the entire log content is loaded into memory at once.
i would like to propose these solution
Implement chunked processing with 16KB buffer size
Add memory threshold checks (100MB default)
Force flush after each chunk
Add garbage collection hints for large files
This maintains all existing functionality while preventing out-of-memory errors. I can submit a PR with implementation, tests, and documentation if this approach looks good to you.
kalinda
added a comment - Hi! from my debugging i found that the problem occurs in AnnotatedLargeText.java where the entire log content is loaded into memory at once.
i would like to propose these solution
Implement chunked processing with 16KB buffer size
Add memory threshold checks (100MB default)
Force flush after each chunk
Add garbage collection hints for large files
This maintains all existing functionality while preventing out-of-memory errors. I can submit a PR with implementation, tests, and documentation if this approach looks good to you.
kalinda
added a comment - Hi! allan_burdajewicz
Please take a look when you have time to this PR https://github.com/jenkinsci/jenkins/pull/10236 —your feedback would be greatly appreciated! 🙌
Thanks in advance! 🚀
Jesse Glick
Allan BURDAJEWICZ
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Hi! from my debugging i found that the problem occurs in AnnotatedLargeText.java where the entire log content is loaded into memory at once.
i would like to propose these solution
This maintains all existing functionality while preventing out-of-memory errors. I can submit a PR with implementation, tests, and documentation if this approach looks good to you.