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undefined symbol: PyUnicodeUCS4_Decode when Start OpsCenter

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Started 1 year ago by
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Anonymous
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There is an error when I Start OpsCenter in the background.

$ opscenter &

Followed the instructions from this page,
http://www.datastax.com/docs/1.0/datastax_enterprise/dse_quickstart#configuring-and-starting-datastax-opscenter

Here is the configuration:

-bash-3.2$ uname -a
Linux vicqadw01.abebooks.com 2.6.18-194.26.1.el5 #1 SMP Fri Oct 29 14:21:16 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux

-bash-3.2$ java -version
java version "1.7.0"
Java(TM) SE Runtime Environment (build 1.7.0-b147)
Java HotSpot(TM) 64-Bit Server VM (build 21.0-b17, mixed mode)

-bash-3.2$ nodetool ring -h localhost
Address DC Rack Status State Load Owns Token
127.0.0.1 Analytics rack1 Up Normal 729.31 KB 100.00% 0

-bash-3.2$ python -V
Python 2.6.7

-bash-3.2$ which openssl
/usr/bin/openssl

Here is the error message:

-bash-3.2$ opscenter &
[1] 31644
-bash-3.2$ Traceback (most recent call last):
File "/usr/share/cassandra/datastax/opscenter-1.3/lib/py-redhat/2.6/amd64/twisted/application/app.py", line 631, in run
runApp(config)
File "/usr/share/cassandra/datastax/opscenter-1.3/lib/py-redhat/2.6/amd64/twisted/scripts/twistd.py", line 23, in runApp
_SomeApplicationRunner(config).run()
File "/usr/share/cassandra/datastax/opscenter-1.3/lib/py-redhat/2.6/amd64/twisted/application/app.py", line 374, in run
self.application = self.createOrGetApplication()
File "/usr/share/cassandra/datastax/opscenter-1.3/lib/py-redhat/2.6/amd64/twisted/application/app.py", line 439, in createOrGetApplication
application = getApplication(self.config, passphrase)
--- <exception caught here> ---
File "/usr/share/cassandra/datastax/opscenter-1.3/lib/py-redhat/2.6/amd64/twisted/application/app.py", line 450, in getApplication
application = service.loadApplication(filename, style, passphrase)
File "/usr/share/cassandra/datastax/opscenter-1.3/lib/py-redhat/2.6/amd64/twisted/application/service.py", line 400, in loadApplication
application = sob.loadValueFromFile(filename, 'application', passphrase)
File "/usr/share/cassandra/datastax/opscenter-1.3/lib/py-redhat/2.6/amd64/twisted/persisted/sob.py", line 210, in loadValueFromFile
exec fileObj in d, d
File "bin/start_opscenter.py", line 1, in <module>
from opscenterd import opscenterd_tap
File "build/lib/python2.7/site-packages/opscenterd/opscenterd_tap.py", line 16, in <module>

File "build/lib/python2.7/site-packages/opscenterd/Config.py", line 391, in init_config

File "build/lib/python2.7/site-packages/opscenterd/events/plugins/CassandraStore.py", line 12, in <module>

File "build/lib/python2.7/site-packages/opscenterd/CassandraService.py", line 17, in <module>

File "build/lib/python2.7/site-packages/opscenterd/Cluster.py", line 14, in <module>

File "build/lib/python2.7/site-packages/opscenterd/AgentServer.py", line 23, in <module>

File "build/lib/python2.7/site-packages/opscenterd/HttpUtils.py", line 10, in <module>

File "/usr/share/cassandra/datastax/opscenter-1.3/lib/py-redhat/2.6/amd64/OpenSSL/__init__.py", line 11, in <module>
import rand, crypto, SSL, tsafe
exceptions.ImportError: /usr/share/cassandra/datastax/opscenter-1.3/lib/py-redhat/2.6/amd64/OpenSSL/crypto.so: undefined symbol: PyUnicodeUCS4_Decode

Failed to load application: /usr/share/cassandra/datastax/opscenter-1.3/lib/py-redhat/2.6/amd64/OpenSSL/crypto.so: undefined symbol: PyUnicodeUCS4_Decode

[1]+ Exit 1 opscenter

I can ran CQL shell,

-bash-3.2$ cqlsh
cqlsh> use craftersman;

cqlsh> select isbn,request_time_unix from s2 limit 2;
isbn | request_time_unix |
| 1319357983 |
| 1319357963 |

cqlsh>

Thanks for the help,

Charlie Z

Posted 1 year ago #
mbulman
Key Master

What operating system are you running specifically? How did you install OpsCenter (is it installed in multiple ways)?

Posted 1 year ago #
Anonymous
Unregistered

Red Hat Enterprise Linux Server release 5.5

-bash-3.2$ cat /etc/redhat-release
Red Hat Enterprise Linux Server release 5.5 (Tikanga)

I installed OpsCenter by following the link here, http://www.datastax.com/docs/1.0/datastax_enterprise/dse_quickstart#configuring-and-starting-datastax-opscenter .

Basically OpsCenter comes with DataStax Enterprise tarball. It's my first time to install OpsCenter on this server. I didn't install it separately.

The cqlsh and Hive works as expected.

Posted 1 year ago #
Anonymous
Unregistered

Will Python 2.7.2 be able to work with OpsCenter?

-bash-3.2$ python -V
Python 2.7.2

Posted 1 year ago #
mbulman
Key Master

Python 2.7 on RHEL is not currently supported. We're working on fixing that in the next release. Your initial output indicated python2.6. If you have since installed python2.7, but python2.6 is still available, you can workaround this by adding the following line to /etc/default/opscenterd:

PYTHON=/usr/bin/python2.6

Let us know if that doesn't work or if you have any more questions.

Posted 1 year ago #
Anonymous
Unregistered

Hi mbulman,

There is no file /etc/default/opscenterd on my Linux. How to generate it?
Is this document not complete? http://www.datastax.com/docs/1.0/datastax_enterprise/dse_quickstart#configuring-and-starting-datastax-opscenter

I got a new Linux server, and installed everything again, and then got same error.
This time is with Python-2.6.7

=== ====
File "build/lib/python2.6/site-packages/opscenterd/HttpUtils.py", line 10, in <module>

File "/usr/share/cassandra/datastax/opscenter-1.3.1/lib/py-redhat/2.6/5/i386/OpenSSL/__init__.py", line 11, in <module>

import rand, crypto, SSL, tsafe

Failed to load application: /usr/share/cassandra/datastax/opscenter-1.3.1/lib/py-redhat/2.6/5/i386/OpenSSL/crypto.so: undefined symbol: PyUnicodeUCS4_Decode

Thanks,
Charlie

Posted 1 year ago #
mbulman
Key Master

How did you install python2.6?

Posted 1 year ago #
Anonymous
Unregistered

Download from http://www.python.org/ftp/python/2.6.7/Python-2.6.7.tgz

Login as root

# tar -xzvf Python-2.6.7.tgz
# cd Python-2.6.7

./configure --enable-shared
make
make install

Error message when run make:

Objects/unicodeobject.c: In function 'PyUnicodeUCS2_FromFormatV':
Objects/unicodeobject.c:685: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
Objects/unicodeobject.c:685: warning: pointer targets in passing argument 1 of 'PyUnicodeUCS2_DecodeUTF8' differ in signedness

Env:

Linux on EC2: CentOS release 5.4 (Final)
java version "1.6.0_29"
Python 2.6.7

Posted 1 year ago #
Anonymous
Unregistered

I'll just give up for now. Waiting for next release.

Thanks for the help.

Posted 1 year ago #
mbulman
Key Master

It looks like python had problems compiling, which I'm sure is what's giving you problems. I would recommend installing python via EPEL by running the following commands as sudo/root:

rpm -Uvh http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-4.noarch.rpm

yum install python26

If that works, then you should be good to go with OpsCenter. Please don't hesitate to let us know if you have any more problems.

Posted 1 year ago #
Anonymous
Unregistered

I get another new server, and installed the Python2.6.5 followed your instruction.
Cassandra, cqlsh and hive works. but opscenter failed. :(

cat /etc/redhat-release
Red Hat Enterprise Linux Server release 5.3 (Tikanga)

$>java -version
java version "1.7.0"
Java(TM) SE Runtime Environment (build 1.7.0-b147)
Java HotSpot(TM) 64-Bit Server VM (build 21.0-b17, mixed mode)

$>uname -a
Linux vicppsdbrac01 2.6.18-128.el5 #1 SMP Wed Dec 17 11:41:38 EST 2008 x86_64 x86_64 x86_64 GNU/Linux

$>python -V
Python 2.6.5

$>iostat -V
sysstat version 7.0.2
(C) Sebastien Godard

$>which openssl
/usr/bin/openssl

This time the error message is:

exceptions.ImportError: No module named OpenSSL

Failed to load application: No module named OpenSSL

/usr/share/cassandra/datastax/opscenter-1.3.1>opscenter &
[1] 401
@vicppsdbrac01:/usr/share/cassandra/datastax/opscenter-1.3.1>Traceback (most recent call last):
File "/usr/share/cassandra/datastax/opscenter-1.3.1/lib/py-redhat/2.6/shared/amd64/twisted/application/app.py", line 631, in run
runApp(config)
File "/usr/share/cassandra/datastax/opscenter-1.3.1/lib/py-redhat/2.6/shared/amd64/twisted/scripts/twistd.py", line 23, in runApp
_SomeApplicationRunner(config).run()
File "/usr/share/cassandra/datastax/opscenter-1.3.1/lib/py-redhat/2.6/shared/amd64/twisted/application/app.py", line 374, in run
self.application = self.createOrGetApplication()
File "/usr/share/cassandra/datastax/opscenter-1.3.1/lib/py-redhat/2.6/shared/amd64/twisted/application/app.py", line 439, in createOrGetApplication
application = getApplication(self.config, passphrase)
--- <exception caught here> ---
File "/usr/share/cassandra/datastax/opscenter-1.3.1/lib/py-redhat/2.6/shared/amd64/twisted/application/app.py", line 450, in getApplication
application = service.loadApplication(filename, style, passphrase)
File "/usr/share/cassandra/datastax/opscenter-1.3.1/lib/py-redhat/2.6/shared/amd64/twisted/application/service.py", line 400, in loadApplication
application = sob.loadValueFromFile(filename, 'application', passphrase)
File "/usr/share/cassandra/datastax/opscenter-1.3.1/lib/py-redhat/2.6/shared/amd64/twisted/persisted/sob.py", line 210, in loadValueFromFile
exec fileObj in d, d
File "bin/start_opscenter.py", line 1, in <module>
from opscenterd import opscenterd_tap
File "build/lib/python2.6/site-packages/opscenterd/opscenterd_tap.py", line 16, in <module>

File "build/lib/python2.6/site-packages/opscenterd/Config.py", line 392, in init_config

File "build/lib/python2.6/site-packages/opscenterd/events/plugins/CassandraStore.py", line 12, in <module>

File "build/lib/python2.6/site-packages/opscenterd/CassandraService.py", line 17, in <module>

File "build/lib/python2.6/site-packages/opscenterd/Cluster.py", line 14, in <module>

File "build/lib/python2.6/site-packages/opscenterd/AgentServer.py", line 23, in <module>

File "build/lib/python2.6/site-packages/opscenterd/HttpUtils.py", line 10, in <module>

exceptions.ImportError: No module named OpenSSL

Failed to load application: No module named OpenSSL

Posted 1 year ago #
Anonymous
Unregistered

BTW, today is our Hack Day. I'm eager to demo the OpsCenter to our workmates.
If it doesn't work today, I'll demo Hive on a 3 node Cassandra cluster.

My customer is http://www.bookfinder.com/ and http://www.fillz.com/ , hope I can persuade them to have DSE as their next big data project database platform.

Thanks,
Charlie | Oracle DBA

Posted 1 year ago #
mbulman
Key Master

Unfortunately the lowest version of RHEL we support is 5.4. Is it possible for you to use a machine with 5.4+ as its OS? Keep in mind OpsCenter does not need to be installed on the same machine as DSE Server/Cassandra, so you don't have to worry about reinstalling those.

Posted 1 year ago #
Anonymous
Unregistered

No worry, I'll have a try on RH5.5.

Posted 1 year ago #
Anonymous
Unregistered

I installed python 2.7.2 with --prefix=home/username/python2-7-2, options defaults and gave me the same error PyUnicodeUCS4_Decode.

I checked out the coding with this:

Import sys >>>
Sys.maxunicode >>> if> 65535:
... print 'UCS4 build'
... else:
... print 'UCS2 build'

UCS2 build.

The solution for this was to reinstall python but this:
. / configure --prefix= / home/username/python-2.7.2 --enable-unicode=ucs4

I check again

Import sys >>>
Sys.maxunicode >>> if> 65535:
... print 'UCS4 build'
... else:
... print 'UCS2 build'

UCS4 build

worked on Red Hat 4.1.2-51 + python-2.7.2

Posted 1 year ago #

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