Details
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Bug
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Status: Resolved
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Major
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Resolution: Fixed
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0.8.0
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Linux Redhat 7.4, Anaconda 4.4.7, Python 2.7.12, CDH 5.13.1
Description
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
(this part depends on your configuration you need those values for pyarrow.hdfs to work: )
(path to libjvm: )
(export JAVA_HOME=/usr/java/jdk1.7.0_67-cloudera)
(path to libhdfs: )
(export LD_LIBRARY_PATH=/opt/cloudera/parcels/CDH-5.14.0-1.cdh5.14.0.p0.24/lib64/)
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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