[HDFS] Wire-protocol compatibility between HDFS 2.10.2 server and 3.3.6 client

Hello HDFS Development Community, I hope you’re doing well. I have an HDFS HA cluster where the NameNode and DataNodes are currently running on version **2.10.2**, but I need to upgrade our HDFS client to **3.3.6** for compatibility with some newer tooling. **My main question**: Is there guarante

Apache Hadoop qbt Report: branch-2.10+JDK7 on Linux/x86_64

For more details, see https://ci-hadoop.apache.org/job/hadoop-qbt-branch-2.10-java7-linux-x86_64/1819/ No changes -1 overall The following subsystems voted -1: asflicense hadolint mvnsite pathlen unit The following subsystems voted -1 but were configured to be filtered/ignored: cc

Apache Hadoop qbt Report: trunk+JDK8 on Linux/x86_64

For more details, see https://ci-hadoop.apache.org/job/hadoop-qbt-trunk-java8-linux-x86_64/2003/ No changes -1 overall The following subsystems voted -1: blanks hadolint pathlen unit xml The following subsystems voted -1 but were configured to be filtered/ignored: cc checkstyle ja

Apache Hadoop qbt Report: trunk+JDK11 on Linux/x86_64

For more details, see https://ci-hadoop.apache.org/job/hadoop-qbt-trunk-java11-linux-x86_64/894/ [Jul 16, 2025, 3:52:40 PM] (github) HADOOP-19615. Upgrade os-maven-plugin to 1.7.1 to support riscv64 (#7796). Contributed by Lei Wen. -1 overall The following subsystems voted -1: blanks h

Apache Hadoop qbt Report: trunk+JDK8 on Linux/x86_64

For more details, see https://ci-hadoop.apache.org/job/hadoop-qbt-trunk-java8-linux-x86_64/2004/ [Jul 16, 2025, 3:52:40 PM] (github) HADOOP-19615. Upgrade os-maven-plugin to 1.7.1 to support riscv64 (#7796). Contributed by Lei Wen. -1 overall The following subsystems voted -1: blanks h