AnaConda环境下安装librosa包超时

问题重现

大家在AnaConda环境下安装包的过程中肯定会遇到下载缓慢的问题。

超时信息如下（为了大家方便通过超时信息找到，牺牲了一些页面体验，把异常信息贴出来）：

conda.exceptions.CondaRuntimeError: Runtime error: Could not open ‘/home/ubuntu/anaconda3/pkgs/icu-64.2-he1b5a44_1.tar.bz2.part‘ for writing (HTTPSConnectionPool(host=‘conda.anaconda.org‘, port=443): Read timed out.).
    
    During handling of the above exception, another exception occurred:
    
    Traceback (most recent call last):
      File "/home/ubuntu/anaconda3/lib/python3.5/site-packages/conda/exceptions.py", line 473, in conda_exception_handler
        return_value = func(*args, **kwargs)
      File "/home/ubuntu/anaconda3/lib/python3.5/site-packages/conda/cli/main.py", line 144, in _main
        exit_code = args.func(args, p)
      File "/home/ubuntu/anaconda3/lib/python3.5/site-packages/conda/cli/main_install.py", line 80, in execute
        install(args, parser, ‘install‘)
      File "/home/ubuntu/anaconda3/lib/python3.5/site-packages/conda/cli/install.py", line 422, in install
        raise CondaSystemExit(‘Exiting‘, e)
      File "/home/ubuntu/anaconda3/lib/python3.5/contextlib.py", line 77, in __exit__
        self.gen.throw(type, value, traceback)
      File "/home/ubuntu/anaconda3/lib/python3.5/site-packages/conda/cli/common.py", line 573, in json_progress_bars
        yield
      File "/home/ubuntu/anaconda3/lib/python3.5/site-packages/conda/cli/install.py", line 420, in install
        raise CondaRuntimeError(‘RuntimeError: %s‘ % e)
    conda.exceptions.CondaRuntimeError: Runtime error: RuntimeError: Runtime error: Could not open ‘/home/ubuntu/anaconda3/pkgs/icu-64.2-he1b5a44_1.tar.bz2.part‘ for writing (HTTPSConnectionPool(host=‘conda.anaconda.org‘, port=443): Read timed out.).

或者如下：

Fetching package metadata ...INFO requests.packages.urllib3.connectionpool:_new_conn(805): Starting new HTTPS connection (1): mirrors.ustc.edu.cn
INFO requests.packages.urllib3.connectionpool:_new_conn(805): Starting new HTTPS connection (1): mirrors.tuna.tsinghua.edu.cn
INFO requests.packages.urllib3.connectionpool:_new_conn(805): Starting new HTTPS connection (1): mirrors.ustc.edu.cn
INFO requests.packages.urllib3.connectionpool:_new_conn(805): Starting new HTTPS connection (1): repo.continuum.io
INFO requests.packages.urllib3.connectionpool:_new_conn(805): Starting new HTTPS connection (1): mirrors.ustc.edu.cn
INFO requests.packages.urllib3.connectionpool:_new_conn(805): Starting new HTTPS connection (1): mirrors.tuna.tsinghua.edu.cn
INFO requests.packages.urllib3.connectionpool:_new_conn(805): Starting new HTTPS connection (1): mirrors.ustc.edu.cn
INFO requests.packages.urllib3.connectionpool:_new_conn(805): Starting new HTTPS connection (1): repo.continuum.io
INFO requests.packages.urllib3.connectionpool:_new_conn(805): Starting new HTTPS connection (1): conda.anaconda.org
INFO requests.packages.urllib3.connectionpool:_new_conn(805): Starting new HTTPS connection (1): conda.anaconda.org
INFO requests.packages.urllib3.connectionpool:_new_conn(805): Starting new HTTPS connection (1): mirrors.tuna.tsinghua.edu.cn
INFO requests.packages.urllib3.connectionpool:_new_conn(805): Starting new HTTPS connection (1): mirrors.tuna.tsinghua.edu.cn
INFO requests.packages.urllib3.connectionpool:_new_conn(805): Starting new HTTPS connection (1): mirrors.tuna.tsinghua.edu.cn
INFO requests.packages.urllib3.connectionpool:_new_conn(805): Starting new HTTPS connection (1): mirrors.tuna.tsinghua.edu.cn
.INFO requests.packages.urllib3.connectionpool:_new_conn(805): Starting new HTTPS connection (1): repo.continuum.io
.INFO requests.packages.urllib3.connectionpool:_new_conn(805): Starting new HTTPS connection (1): repo.continuum.io
.........Could not connect to https://conda.anaconda.org/conda-forge/linux-64/
INFO requests.packages.urllib3.connectionpool:_new_conn(805): Starting new HTTPS connection (1): conda.anaconda.org
..INFO requests.packages.urllib3.connectionpool:_new_conn(805): Starting new HTTPS connection (1): mirrors.ustc.edu.cn
INFO requests.packages.urllib3.connectionpool:_new_conn(805): Starting new HTTPS connection (1): mirrors.tuna.tsinghua.edu.cn
...INFO requests.packages.urllib3.connectionpool:_get_conn(249): Resetting dropped connection: mirrors.ustc.edu.cn
...INFO requests.packages.urllib3.connectionpool:_new_conn(805): Starting new HTTPS connection (1): repo.continuum.io
WARNING requests.packages.urllib3.connectionpool:urlopen(664): Retrying (Retry(total=2, connect=None, read=None, redirect=None)) after connection broken by ‘ReadTimeoutError("HTTPSConnectionPool(host=‘repo.continuum.io‘, port=443): Read timed out. (read timeout=3.05)",)‘: /pkgs/free/linux-64/repodata.json.bz2
INFO requests.packages.urllib3.connectionpool:_new_conn(805): Starting new HTTPS connection (2): repo.continuum.io

解决方法

通常的解决方法是切换到国内的镜像源

如conda切换到中科大源，命令行下执行

conda config --add channels https://mirrors.ustc.edu.cn/anaconda/pkgs/main/
conda config --add channels https://mirrors.ustc.edu.cn/anaconda/pkgs/free/
conda config --add channels  https://mirrors.ustc.edu.cn/anaconda/cloud/conda-forge/

pip切换源参考这里：pip设置安装源

 但是有时候即便切换了源，有些页面因为网络或者服务器原因下载仍旧是缓慢，直至出现超时。

笔者最近下载librosa，执行以下命令，最终超时下载不了。

conda install librosa -c conda-forge

后来又添加了一个-v参数查看执行命令情况

conda install librosa -v -c conda-forge

发现有执行超时的情况

 后来在stackoverflow上面找到了答案，AnaConda在4.3版本以下读取超时都是被硬编码成60秒，这个显然是不合理的。

conda config --set remote_read_timeout_secs 3600

:~$ conda config --set remote_read_timeout_secs 3600
CondaValueError: Value error: Error key must be one of add_binstar_token, update_dependencies, binstar_upload, always_copy, anaconda_upload, add_pip_as_python_dependency, allow_other_channels, channel_priority, changeps1, always_yes, shortcuts, channel_alias, use_pip, auto_update_conda, add_anaconda_token, ssl_verify, client_cert_key, client_cert, show_channel_urls, offline, allow_softlinks, not remote_read_timeout_secs

# # remote_connect_timeout_secs (float)
# #   The number seconds conda will wait for your client to establish a
# #   connection to a remote url resource.
# # 
# remote_connect_timeout_secs: 9.15

# # remote_read_timeout_secs (float)
# #   Once conda has connected to a remote resource and sent an HTTP
# #   request, the read timeout is the number of seconds conda will wait for
# #   the server to send a response.
# # 
# remote_read_timeout_secs: 60.0

wget https://repo.anaconda.com/archive/Anaconda3-2019.10-Linux-x86_64.sh
chmod +x Anaconda3-2019.10-Linux-x86_64.sh

vim ~/.bashrc

# added by Anaconda3 4.2.0 installer
export PATH="/home/ubuntu/anaconda3/bin:$PATH"
export CUDA_HOME=/usr/local/cuda-10.2
export PATH="$CUDA_HOME/bin:$PATH"
export LD_LIBRARY_PATH="$CUDA_HOME/lib64:$LD_LIBRARY_PATH"