branch-0.23 does not seem to build for me after applying the patch. I am using RHEL 5, mvn 3.0.3, the sun JDK 1.6.0_26.
I get some classpath errors like
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.5.1:compile (default-compile) on project hadoop-hdfs: Compilation failure: Compilation failure:
[ERROR] branch-0.23/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java:[105,63] package org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos does not exist
Radim, did you see anything like this?