Thanks. 在 2015年9月15日星期二 UTC+8上午4:17:40，Feng Xiao写道： > > On Mon, Sep 14, 2015 at 5:23 AM, sam sun <[email protected] <javascript:>> > wrote: > >> 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. >> > We will take this into consideration and see what we can do. Maintaining > full compatibility is hard though (especially when we already have > incompatible changes in v3.0.0 alpha/beta releases). > > >> 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] <javascript:>. >> To post to this group, send email to [email protected] >> <javascript:>. >> Visit this group at http://groups.google.com/group/protobuf. >> For more options, visit https://groups.google.com/d/optout. >> > >
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