risdenk edited a comment on issue #553: SOLR-9515: Update to Hadoop 3 URL: https://github.com/apache/lucene-solr/pull/553#issuecomment-458633207 @uschindler sorry I definitely didn't explain it as well as I could have. Hadoop moved from old mortbay Jetty to Jetty 9.3. Solr is on Jetty 9.4. Session management changed between Jetty 9.3 and 9.4. For the integration tests with Hadoop, the classpath has Jetty 9.4. Adding Jetty 9.3 isn't possible since then the new HTTP2 tests don't work. The smallest change I could make was to copy HttpServer2 from Hadoop and fix the session management sections for Jetty 9.4. The changes are similar to https://issues.apache.org/jira/browse/HADOOP-14930 which looked at upgrading Hadoop to Jetty 9.4. So yes your understanding is correct in that we can't have both Jetty 9.3 and 9.4 on the Solr test classpath. The testing I have done shows that the Hadoop integration tests work with Jetty 9.4 with the copied/patched HttpServer2 code.
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