Since the map type is important to me, i decided to use proto3, so i moved hashLong method from com.google.protobuf.Internal.hashLong/hashEnum/xx to GeneratedMessage in proto3 source code and solved the problem, however, to maintain a special version by myself is really a bad idea. I do think it's very import to keep full backward compatibility with code generated by proto2 since so many widely used opensource libs depends on protobuf as i have mentioned before, especially protobuf2.5. Thanks
在 2015年9月7日星期一 UTC+8下午3:05:50，sam sun写道： > > I knew it, because yarn depends on proto2 but my lib depends on proto3. > The reason is that proto3 runtime doesn't keep backward compatibility. The > problem can be reproduced if set option java_generate_equals_and_hash = > true with proto2. > > I hope msg with proto2 still work with proto3 jar since proto2 has been > widely used in opensource system like yarn, hbase, etc. > > > > 在 2015年9月7日星期一 UTC+8下午2:31:04，Feng Xiao写道： >> >> On Sat, Sep 5, 2015 at 9:08 PM, sam sun <[email protected]> wrote: >> >>> I use proto3 to log user event and then run a mapreduce to stat same >>> metrics. But it reports an error: >>> >>> Exception in thread "Thread-2" java.lang.NoSuchMethodError: >>> org.apache.hadoop.yarn.proto.YarnProtos$LocalResourceProto.hashLong(J)I >>> at >>> org.apache.hadoop.yarn.proto.YarnProtos$LocalResourceProto.hashCode(YarnProtos.java:11555) >>> at >>> org.apache.hadoop.yarn.api.records.impl.pb.LocalResourcePBImpl.hashCode(LocalResourcePBImpl.java:62) >>> at java.util.HashMap.hash(HashMap.java:338) >>> at java.util.HashMap.put(HashMap.java:611) >>> >>> The problem is proto3 doesn't keep backward compatibility with proto2. >>> hashLong is no longer exists in generated code with proto3. Now I faced a >>> deed situation that neither proto2 nor proto3 can be loaded when i run a >>> mapreduce job. >>> >> It seems the problem is that your binary depends on both proto2 Java >> runtime and also proto3 Java runtime. One of them will be shadowed by the >> other and you will see such runtime errors. The suggestion is to stick with >> one version through out your project (including all your project's >> dependencies). >> >> >>> >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Protocol Buffers" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To post to this group, send email to [email protected]. >>> Visit this group at http://groups.google.com/group/protobuf. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- You received this message because you are subscribed to the Google Groups "Protocol Buffers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/protobuf. For more options, visit https://groups.google.com/d/optout.
