使用pyarrow时无法加载libhdfs

Question

我正在尝试通过Pyarrow连接到HDFS，但由于无法加载libhdfs库而无法工作。

libhdfs.so既在$HADOOP_HOME/lib/native中，也在$ARROW_LIBHDFS_DIR中。

print(os.environ['ARROW_LIBHDFS_DIR'])
fs = hdfs.connect()


bash-3.2$ ls $ARROW_LIBHDFS_DIR
examples        libhadoop.so.1.0.0  libhdfs.a       libnativetask.a
libhadoop.a     libhadooppipes.a    libhdfs.so      libnativetask.so
libhadoop.so        libhadooputils.a    libhdfs.so.0.0.0    libnativetask.so.1.0.0

我得到的错误是：

Traceback (most recent call last):
  File "wine-pred-ml.py", line 31, in <module>
    fs = hdfs.connect()
  File "/Users/PVZP/Library/Python/2.7/lib/python/site-packages/pyarrow/hdfs.py", line 183, in connect
    extra_conf=extra_conf)
  File "/Users/PVZP/Library/Python/2.7/lib/python/site-packages/pyarrow/hdfs.py", line 37, in __init__
    self._connect(host, port, user, kerb_ticket, driver, extra_conf)
  File "pyarrow/io-hdfs.pxi", line 89, in pyarrow.lib.HadoopFileSystem._connect
  File "pyarrow/error.pxi", line 83, in pyarrow.lib.check_status
pyarrow.lib.ArrowIOError: Unable to load libhdfs

Answer 1

这解决了我的问题：

conda install libhdfs3 pyarrow

在您的script.py中：

import os
os.environ['ARROW_LIBHDFS_DIR'] = '/opt/cloudera/parcels/CDH/lib64/'

其中路径是libhdfs3所在的目录-在我的示例中，这是Cloudera托管库的位置