tldr; you have to run "rm -rf $IMPALA_TOOLCHAIN/orc-*" This change has just been submitted: https://gerrit.cloudera.org/#/c/10755/
It updates protobuf to version 3 and adds libunwind in preparation for rebasing our KRPC code and to enable porting of more RPCs to KRPC. The new toolchain build has orc built against protobuf version 3 and you will need to re-download orc. Otherwise you will see linker errors like this one: /opt/Impala-Toolchain/orc-1.4.3-p2/lib/liborc.a(orc-proto-wrapper.cc.o):orc-proto-wrapper.cc:function orc::proto::PostScript::ByteSizeLong() const: error: undefined reference to 'google::protobuf::internal::WireFormatLite::UInt32Size(google::protobuf::RepeatedField<unsigned int> const&)' To re-download orc you can simply remove it by running "rm -rf $IMPALA_TOOLCHAIN/orc-*" and rebuild. It will get downloaded automatically. Apologies for the inconvenience and the required manual step. The alternative would have been to create an empty patch for orc in our toolchain, but we've discarded it as too hacky in the past. Let me know if you have any questions. Cheers, Lars