[GitHub] [tomcat-connectors] gjaekel commented on pull request #7: Possible issue in ajp_read_fully_from_server()

["gjaekel (via GitHub)" <gi...@apache.org>]

gjaekel commented on PR #7:
URL: https://github.com/apache/tomcat-connectors/pull/7#issuecomment-1476084475

   Dear Mark,
   
   first let my thank you for quick reply. I understand you in a way that this is already a "death code path" that can't rise issues anymore.
   
   I actually "staring at the code" because I have to solve an Issue that appeared for us with the transition from Apache httpd-2.4.53 to 2.4.54 (and also 2.4.56). It's related to transmitting bigger amounts of data via POST requests using the httpd as a (ssl) reverse proxy for our Wildfly farm. Using the newer one, the ongoing request will fail after some seconds. At about ~512M, the usecase becomes unstable (, .i.e. breaks some time) and at about ~1GB, it fails virtually all the time.
   
   I yet don't have any idea, what's happening and what's the reason. In the *mod_jk* log, I found:
   ```
   20230316-101703.162 [37588:139628162045632] [info] ajp_read_into_msg_buff::jk_ajp_common.c (1549): (test-flyA) receiving data from client failed. Connection aborted or network problems
   20230316-101703.162 [37588:139628162045632] [info] ajp_process_callback::jk_ajp_common.c (2101): (test-flyA) Reading from client aborted or client network problems
   20230316-101703.162 [37588:139628162045632] [info] ajp_service::jk_ajp_common.c (2774): (test-flyA) sending request to tomcat failed (unrecoverable), because of client read error (attempt=1)
   20230316-101703.162 [37588:139628162045632] [info] service::jk_lb_worker.c (1600): service failed, worker test-flyA is in local error state
   20230316-101703.162 [37588:139628162045632] [info] service::jk_lb_worker.c (1619): unrecoverable error 400, request failed. Client failed in the middle of request, we can't recover to another instance.
   20230316-101703.162 [37588:139628162045632] [info] jk_handler::mod_jk.c (2991): Aborting connection for worker=test-flyAB
   20230316-101703.162 test-flyA 7.334024 400 http://etc.dnb.de.test/aras/access/repositories/dma/artifacts/1235459136/unpackStream?pathfilter=content
   ```
   The version is mod_jk-1.2.48 and it's hold while switching the http versions. I don't understand what may trigger an issue in *mod_jk* while using the updated httpd.
   
   Do you have any hints for me?


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