https://bz.apache.org/bugzilla/show_bug.cgi?id=64944
Bug ID: 64944
Summary: Incorrect bytesSent metric when compression is enabled
Product: Tomcat 9
Version: 9.0.39
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: dev@tomcat.apache.org
Reporter: chen...@gmail.com
Target Milestone: -----
I'm using Spring Boot 2.2.11 with Tomcat 9.0.39. I found when compression is
enabled, the bytesSent metric exposed by org.apache.coyote.RequestGroupInfo is
always 0. Those metrics are exposed in JMX as well.
I believe the issue is caused by
org.apache.coyote.http11.filters.GzipOutputFilter.doWrite(ByteBuffer)
implementation. It doesn't change the chunk parameter position in this code
branch:
if (chunk.hasArray()) {
compressionStream.write(chunk.array(), chunk.arrayOffset() +
chunk.position(), len);
}
So org.apache.coyote.Response.doWrite(ByteBuffer) method will not be able to
update contentWritten correctly:
contentWritten += len - chunk.remaining();
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