Alexey Serbin created KUDU-3334:
-----------------------------------
Summary: Clarify whether it's possible to hide libprotobuf symbols
exported from libkudu_client
Key: KUDU-3334
URL: https://issues.apache.org/jira/browse/KUDU-3334
Project: Kudu
Issue Type: Task
Reporter: Alexey Serbin
Assignee: Alexey Serbin
As it turned out, there are conflicts during static initialization of symbols
related to protobuf extensions in Impala which links in {{libkudu_client}}
while dynamically linking in {{libprotobuf}} on itself. It seems the issue
might be caused by the fact of having two separate registries of for protobuf
types descriptors, so eventually impala complains about that in run-time:
{noformat}
[libprotobuf ERROR google/protobuf/descriptor.cc:3620] Invalid proto descriptor
for file "kudu/rpc/rpc_header.proto":
[libprotobuf ERROR google/protobuf/descriptor.cc:3623]
kudu.rpc.track_rpc_result: ".google.protobuf.MethodOptions" is not defined.
[libprotobuf ERROR google/protobuf/descriptor.cc:3623] kudu.rpc.authz_method:
".google.protobuf.MethodOptions" is not defined.
[libprotobuf ERROR google/protobuf/descriptor.cc:3623]
kudu.rpc.default_authz_method: ".google.protobuf.ServiceOptions" is not defined.
{noformat}
>From examining the libkudu_client, it turns out some related protobuf symbols
>are discoverable:
{noformat}
$ nm -g libkudu_client.so | grep protobuf | grep desc
00000000006469a0 R _ZN50TableStruct_google_2fprotobuf_2fdescriptor_2eproto7offse
tsE
0000000000751a20 D descriptor_table_google_2fprotobuf_2fany_2eproto
0000000000751580 D descriptor_table_google_2fprotobuf_2fdescriptor_2eproto
0000000000751ac0 D
descriptor_table_google_2fprotobuf_2fsource_5fcontext_2eproto0000000000751b60 D
descriptor_table_google_2fprotobuf_2ftype_2eproto
0000000000751cc0 D descriptor_table_google_2fprotobuf_2fwrappers_2eproto
0000000000751900 D scc_info_DescriptorProto_ExtensionRange_google_2fprotobuf_2fd
escriptor_2eproto
00000000007519f0 D scc_info_DescriptorProto_ReservedRange_google_2fprotobuf_2fde
scriptor_2eproto
0000000000751920 D scc_info_DescriptorProto_google_2fprotobuf_2fdescriptor_2epro
to
00000000007519d0 D scc_info_EnumDescriptorProto_EnumReservedRange_google_2fproto
buf_2fdescriptor_2eproto
00000000007518c0 D scc_info_EnumDescriptorProto_google_2fprotobuf_2fdescriptor_2
eproto
00000000007518a0 D scc_info_EnumOptions_google_2fprotobuf_2fdescriptor_2eproto
0000000000751880 D scc_info_EnumValueDescriptorProto_google_2fprotobuf_2fdescrip
tor_2eproto
0000000000751860 D scc_info_EnumValueOptions_google_2fprotobuf_2fdescriptor_2epr
oto
0000000000751840 D scc_info_ExtensionRangeOptions_google_2fprotobuf_2fdescriptor
_2eproto
0000000000751820 D scc_info_FieldDescriptorProto_google_2fprotobuf_2fdescriptor_
2eproto
0000000000751800 D scc_info_FieldOptions_google_2fprotobuf_2fdescriptor_2eproto
00000000007517a0 D scc_info_FileDescriptorProto_google_2fprotobuf_2fdescriptor_2
eproto
0000000000751780 D scc_info_FileDescriptorSet_google_2fprotobuf_2fdescriptor_2ep
roto
0000000000751760 D scc_info_FileOptions_google_2fprotobuf_2fdescriptor_2eproto
00000000007519b0 D scc_info_GeneratedCodeInfo_Annotation_google_2fprotobuf_2fdes
criptor_2eproto
0000000000751740 D scc_info_GeneratedCodeInfo_google_2fprotobuf_2fdescriptor_2ep
roto
0000000000751720 D scc_info_MessageOptions_google_2fprotobuf_2fdescriptor_2eprot
o
0000000000751700 D scc_info_MethodDescriptorProto_google_2fprotobuf_2fdescriptor
_2eproto
00000000007516e0 D scc_info_MethodOptions_google_2fprotobuf_2fdescriptor_2eproto
00000000007516c0 D scc_info_OneofDescriptorProto_google_2fprotobuf_2fdescriptor_
2eproto
00000000007516a0 D scc_info_OneofOptions_google_2fprotobuf_2fdescriptor_2eproto
0000000000751660 D scc_info_ServiceDescriptorProto_google_2fprotobuf_2fdescripto
r_2eproto
0000000000751640 D scc_info_ServiceOptions_google_2fprotobuf_2fdescriptor_2eprot
o
0000000000751990 D scc_info_SourceCodeInfo_Location_google_2fprotobuf_2fdescript
or_2eproto
0000000000751620 D scc_info_SourceCodeInfo_google_2fprotobuf_2fdescriptor_2eprot
o
0000000000751970 D scc_info_UninterpretedOption_NamePart_google_2fprotobuf_2fdes
criptor_2eproto
0000000000751600 D scc_info_UninterpretedOption_google_2fprotobuf_2fdescriptor_2
eproto
{noformat}
So, it seems the issue might be addressed by hiding the symbols from the
libprotobuf library linked in statically by libkudu_client.
I found this article which seems to be relevant:
https://stackoverflow.com/questions/2222162/how-to-apply-fvisibility-option-to-symbols-in-static-libraries
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