debugging the mongodb server

[Ananya]

Hi,
I wanted to know how I can debug the mongodb server. I have built it from the source and am working on linux.

[Kaloian Manassiev]

Hi Ananya,

The easiest way to step through the server code is to build the server with no optimizations (--dbg=on --opt=off) and start it under gdb. Another option is lldb.

Hope this helps.

-Kal.

[Harshada Chavan]

Hi Kal,

I am trying to debug MongoDB 3.2.7 using GDB.

I did build my source as: scons --dbg=on --opt=off -j 8 core

and trying to start the server under GDB as:

~/mongodb/mongodb-src-r3.2.7/build/debug/mongo$ gdb mongod

GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1

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Type "show configuration" for configuration details.

For bug reporting instructions, please see:

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Find the GDB manual and other documentation resources online at:

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For help, type "help".

Type "apropos word" to search for commands related to "word"...

Reading symbols from mongod...done.

(gdb) break parseArrayOfCoordinates

Function "parseArrayOfCoordinates" not defined.

Make breakpoint pending on future shared library load? (y or [n])

This breakpoint is never hit. I also tried starting mongodb outside of GDB and attaching GDB to the mongod process.. No success there as well.

Am I missing anything here? I greatly appreciate any help.

Thanks in advance.

-Harsgada

[Andrew Morrow]

Hi -

Please see my other reply to your email about setting breakpoints. You need to qualify the name with 'mongo::' since that function is within the 'mongo' namespace. Please note that some functions, particularly those within unnamed namespaces, cannot easily be named as symbols, and need to have the breakpoint set by file and line (e.g. break foo.cpp:42). In the case of mongo::parseArrayOfCoordinates, the function is file-scoped static, so it may or may not have a symbolic existence, depending on the compiler and optimization options.

Andrew

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[Harshada Chavan]

Hi Andrew,

Thanks for the information. I ll be mindful of this. I could set the breakpoint with "mongo::".

Thanks,

Harshada