Got message "Please install gflags to run rocksdb tools" while running ./db_bench

[JevonQ]

I just compiled RocksDB on CentOS 7.1 yesterday with no errors, but when I try to run ./db_bench command I got the message "Please install gflags to run rocksdb tools". I built and installed gflags from scratch. Since the compilation of RocksDB have succeeded, so I think the installation of gflags succeeds as well.

I also tried to google the problem but with no luck, can anyone help me out of this?

[IslamAbdelRahman]

RocksDB can compile even if gflags don't exist, please try re-compiling after installing gflags

[JevonQ]

@IslamAbdelRahman, thanks for your reply. I still get the same error, as follows

[root@localhost rocksdb-5.1.2]# ./db_bench --benchmarks=readrandomwriterandom --key_size=512 --value_size=3584 --open_files=65528 --num_levels=3 --max_bytes_for_level_base=629145600 --target_file_size_multiplier=10 --block_size=131072 --compaction_pri=3 --target_file_size_base=1048576 --threads=1 --num=500000
Please install gflags to run rocksdb tools

[root@localhost rocksdb-5.1.2]# rpm -qa|grep gflags
gflags-devel-2.1.1-6.el7.x86_64
gflags-2.1.1-6.el7.x86_64

[JevonQ]

Finally, I noticed the following comments in file build_tools/build_detect_platform,
" Using gflags in rocksdb:
Our project depends on gflags, which requires users to take some extra steps
before they can compile the whole repository:

1. Install gflags. You may download it from here:
   https://gflags.github.io/gflags/ (Mac users can brew install gflags)
2. Once installed, add the include path for gflags to your CPATH env var and
   the lib path to LIBRARY_PATH. If installed with default settings, the lib
   will be /usr/local/lib and the include path will be /usr/local/include"

After setting CPATH and LIBRARY_PATH, I can run db_bench now. I'll update the installation document to illustrate this.

[JevonQ]

Close this issue as it is resolved.

[kyleyuanmh]

Is there some solution to solve this problem??

[rba4062]

@JevonQ Were you able to solve this issue. If yes, which OS version and how. I have tried several things mentioned in the readme etc, but unable to find the issue here.

I am trying to compile it on Ubuntu 18.04 and was using the following command

CPATH=/usr/include/gflags/ LIBRARY_PATH=${LIBRARY_PATH}:/usr/lib/x86_64-linux-gnu/ make -j 4 db_bench

Gflags is correctly installed in my machine

ls /usr/lib/x86_64-linux-gnu/libgflags.so -la 
lrwxrwxrwx 1 root root 16 Aug  6  2017 /usr/lib/x86_64-linux-gnu/libgflags.so -> libgflags.so.2.2

[csyjia]

Please remember to "make clean" before "make" after installing gflags.

[Kodairoad]

I've seen this error too. but my situation was bit different.
I am not supposed to run “mkdir build && cd build” but just “make release” from main folder. I kept digging into gflags and its nothing to do with it.

[lcoon815]

@JevonQ I am having this problem now but i do not understand how to set the CPATH and LIBRARY_PATH. Could you posted the step here? I am new to RocksDB.