Not able to make standalone nebula graph work

[chiru-arh]

I have installed nebulagraph standalone for linux with the below mentioned installation steps. However I'm not able to make the client work.

Installation steps : Built from source

1. Nebulagraph (Standalone)
   $ git clone --branch release-3.3 https://github.com/vesoft-inc/nebula.git
   $ cd nebula
   $ mkdir build && cd build
   $ cmake -DCMAKE_INSTALL_PREFIX=/usr/local/nebula -DENABLE_TESTING=OFF -DENABLE_STANDALONE_VERSION=on -
   DCMAKE_BUILD_TYPE=Release ..
   $ make -j2
   $ sudo make install

2. Nebula cpp client
   $ git clone --branch release-3.3 https://github.com/vesoft-inc/nebula-cpp.git
   $ cd nebula-cpp
   $ mkdir build && cd build
   $ cmake -DCMAKE_BUILD_TYPE=Release ..
   $ make
   $ sudo make install
   $ sudo ldconfig

3. Start the nebula service
   $ sudo /usr/local/nebula/scripts/nebula.service start all

4. Compile example code (SessionExample.cpp)
   $ LIBRARY_PATH=/usr/local/nebula/lib:$LIBRARY_PATH g++ -std=c++11 SessionExample.cpp -I/usr/local/nebula/include -lnebula_graph_client -o session_example

5. Run session_example
   $ ./session_example

6. I get the below log after the above step and the program doesn't terminate (gets stuck in ConnectionPool init function)
   $ Current address : 127.0.0.1:9669

[SuperYoko]

Failed to reproduce the issue in release-3.3, can you please give more info? Like standalone info log or config. Or maybe use gcc to debug your code?

[chiru-arh]

Thank you for verifying. I tried on a different machine and I get the below logs for SessionExample.cpp

Current address: 192.168.0.101:9669
Host|Port|HTTP port|Status|Leader count|Leader distribution|Partition distribution|Version|
"127.0.0.1"|9779|19779|"ONLINE"|0|"No valid partition"|"No valid partition"|""|

Host|Port|HTTP port|Status|Leader count|Leader distribution|Partition distribution|Version|
"127.0.0.1"|9779|19779|"ONLINE"|0|"No valid partition"|"No valid partition"|""|

Additionally StorageClientExample.cpp gives below logs
E0203 15:10:55.648643 14699 MetaClient.cpp:42] Get space id for nba failed
scan edge...

[chiru-arh]

Additionally StorageClientExample.cpp gives below logs
E0203 15:10:55.648643 14699 MetaClient.cpp:42] Get space id for nba failed
scan edge...

How can I fix above error?
Also is there any more documentation for nebula cpp client usage to create space, executing nGQL commands etc similar to nebula console?

[wey-gu]

@chiru091096 could you try to do things with nebula-console or nebula-studio, looks like things are fine now.

With nebula-console, you could type:
:play basketballplayer
Then you will have the graph space named basketballplayer as it was mention the most in the docs.

[chiru-arh]

Hi @wey-gu ,
I'm able to execute mentioned commands with nebula console and it works fine. I'm even able to create new spaces, create verticies, edges etc. However, how can I do the same with the nebula cpp client?

[wey-gu]

Hi @wey-gu , I'm able to execute mentioned commands with nebula console and it works fine. I'm even able to create new spaces, create verticies, edges etc. However, how can I do the same with the nebula cpp client?

Yes, it should be equivalent, but one thing that may confuse you is DDL(schema-related queries, including space creation, tag creation, index creation, etc.) won't take effect after the query is executed, it's async and will need (up to) two heartbeats to take effect.

[chiru-arh]

okay, @wey-gut hanks for the information.
Additionally, @wey-gu, @SuperYoko is there any example code or documentation I can refer to for executing DDL(schema-related queries, including space creation, tag creation, index creation, etc.) operations with nebula cpp client? If you can share it, it'll be very helpful.

[chiru-arh]

Hi,
I added below code to create space in SessionExample.cpp file with nebula-cpp client

result = session.execute("CREATE SPACE basketballplayer(partition_num=15, replica_factor=1, vid_type=fixed_string(30));");
if (result.errorCode != nebula::ErrorCode::SUCCEEDED) {
std::cout << "Exit with error code: " << static_cast<int>(result.errorCode) << std::endl;
return static_cast<int>(result.errorCode);
}
std::cout << *result.data <<std::endl;

However, executing it results in segmentation fault with bellow logs

*** Aborted at 1675765960 (Unix time, try 'date -d @1675765960') ***
*** Signal 11 (SIGSEGV) (0x0) received by PID 21393 (pthread TID 0x7f898b685ac0) (linux TID 21393) (code: address not mapped to object), stack trace: ***
/usr/local/nebula/lib/libnebula_graph_client.so(+0x3c53e1)[0x7f898ab5d3e1]
/usr/local/nebula/lib/libnebula_graph_client.so(+0x3bc18b)[0x7f898ab5418b]
/usr/local/nebula/lib/libnebula_graph_client.so(+0x3ba4c7)[0x7f898ab524c7]
/lib/x86_64-linux-gnu/libc.so.6(+0x354bf)[0x7f8989e074bf]
./session_example[0x4033f5]
./session_example(_ZNK6nebula7DataSet8toStringB5cxx11Ev+0x54)[0x402a12]
./session_example[0x402cb7]
./session_example[0x401f57]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xef)[0x7f8989df283f]
./session_example[0x401978]
(safe mode, symbolizer not available)
Segmentation fault (core dumped)

However, the same query works fine with nebula-graph console. How can I fix this

[wey-gu]

@Shylock-Hg do you have more ideas on this, please?

[Shylock-Hg]

@Shylock-Hg do you have more ideas on this, please?

Create space is a DDL statement, its result has no data field.

[chiru-arh]

@Shylock-Hg thank you for the reply. I removed the statement accessing data field and that crash issue was resolved.
Further I'm able to create and use space. I'm also able to create Tag.

Thank you @wey-gu,@Shylock-Hg, @SuperYoko , @Sophie-Xie for the quick support.