[jira] [Created] (ARROW-2113) [Python] Connect to hdfs failing with "pyarrow.lib.ArrowIOError: HDFS connection failed"

["Michal Danko (JIRA)" <ji...@apache.org>]

Michal Danko created ARROW-2113:
-----------------------------------

             Summary: [Python] Connect to hdfs failing with "pyarrow.lib.ArrowIOError: HDFS connection failed"
                 Key: ARROW-2113
                 URL: https://issues.apache.org/jira/browse/ARROW-2113
             Project: Apache Arrow
          Issue Type: Bug
          Components: Python
    Affects Versions: 0.8.0
         Environment: Linux Redhat 7.4, Anaconda 4.4.7, Python 2.7.12, CDH 5.13.1
            Reporter: Michal Danko


Steps to replicate the issue:

mkdir /tmp/test
cd /tmp/test
mkdir jars
cd jars
touch test1.jar
mkdir -p ../lib/zookeeper
cd ../lib/zookeeper
ln -s ../../jars/test1.jar ./test1.jar
ln -s test1.jar test.jar
mkdir -p ../hadoop/lib
cd ../hadoop/lib
ln -s ../../../lib/zookeeper/test.jar ./test.jar

export CLASSPATH="/tmp/test/lib/hadoop/lib/test.jar"

python
import pyarrow.hdfs as hdfs;
fs = hdfs.connect(user="hdfs")

 

Ends with error:

------------
loadFileSystems error:
(unable to get root cause for java.lang.NoClassDefFoundError)
(unable to get stack trace for java.lang.NoClassDefFoundError)
hdfsBuilderConnect(forceNewInstance=0, nn=default, port=0, kerbTicketCachePath=(NULL), userName=pa) error:
(unable to get root cause for java.lang.NoClassDefFoundError)
(unable to get stack trace for java.lang.NoClassDefFoundError)
Traceback (most recent call last): (
 File "<stdin>", line 1, in <module>
 File "/opt/pa/anaconda2/lib/python2.7/site-packages/pyarrow/hdfs.py", line 170, in connect
 kerb_ticket=kerb_ticket, driver=driver)
 File "/opt/pa/anaconda2/lib/python2.7/site-packages/pyarrow/hdfs.py", line 37, in __init__
 self._connect(host, port, user, kerb_ticket, driver)
 File "pyarrow/io-hdfs.pxi", line 87, in pyarrow.lib.HadoopFileSystem._connect (/arrow/python/build/temp.linux-x86_64-2.7/lib.cxx:61673)
 File "pyarrow/error.pxi", line 79, in pyarrow.lib.check_status (/arrow/python/build/temp.linux-x86_64-2.7/lib.cxx:8345)
pyarrow.lib.ArrowIOError: HDFS connection failed
-------------

 

export CLASSPATH="/tmp/test/lib/zookeeper/test.jar"
python
import pyarrow.hdfs as hdfs;
fs = hdfs.connect(user="hdfs")

 

Works properly.

 

I can't find reason why first CLASSPATH doesn't work and second one does, because it's path to same .jar, just with extra symlink in it. To me, it looks like pyarrow.lib.check has problem with symlinks defined with many ../.../.. .

I would expect that pyarrow would work with any definition of path to .jar

Please notice that path are not generated at random, it is path copied from Cloudera distribution of Hadoop (original file was zookeeper.jar),

Because of this issue, our customer currently can't use pyarrow lib for oozie workflows.



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