[Question posted by a user on YugabyteDB Community Slack]
With 2.15.0.0 yb_enable_read_committed_isolation flag doesn’t seem to work anymore? This was working with 2.13:
ERROR: unknown command line flag '--yb_enable_read_committed_isolation'
I’m running yugabyted with:
/yugabyte/bin/yugabyted start --daemon=false --ui=false --initial_scripts_dir=/init-scripts --tserver_flags="--yb_enable_read_committed_isolation=true"
It’s a tserver gflag, so that should be --tserver_flags="--yb_enable_read_committed_isolation=true" and it will work.
Related
Q1. What versions are we using?
Ans.
Python 3.6.12
OS : CentOS 7 64-bit
DB : Oracle 18c
Django 2.2
cx_Oracle : 8.1.0
Q2. Describe the problem
Ans. While running server with "python3 manage.py runserver"
application is able to contact Oracle DB and show the Django Administration page and login also works.
But when we access the application using the Apache (HTTPD) based URL over secure SSL port, we do see the Django page and the admin page as well but Login to Admin page with Internal server error.
In the logs, we see
"django.db.utils.DatabaseError: Error while trying to retrieve text for error ORA-01804"
cx_oracle is otherwise able to connect to the database properly, another application is also using the same database behind the same httpd proxy and works fine
Q3. Show the directory listing where your Oracle Client libraries are installed (e.g. the Instant Client directory). Is it 64-bit or 32-bit?
Ans. 64-bit
Q4. Show what the PATH environment variable (on Windows) or LD_LIBRARY_PATH (on Linux) is set to?
LD_LIBRARY_PATH=/srv/vol/db/oracle/product/18.0.0/dbhome_1/lib:/lib:/usr/lib
PATH=$ORACLE_HOME/bin:/srv/vol/db/oracle/product/18.0.0/dbhome_1/lib:$PATH
Q5. Show any Oracle environment variables set (e.g. ORACLE_HOME, ORACLE_BASE).
ORACLE_HOME=/srv/vol/db/oracle/product/18.0.0/dbhome_1
TNS_ADMIN=$ORACLE_HOME/network/admin
NLS_LANG=AMERICAN_AMERICA.AL32UTF8
ORACLE_BASE=/srv/vol/db/oracle
CLASSPATH=$ORACLE_HOME/jlib:$ORACLE_HOME/rdbms/jlib:$ORACLE_HOME/lib
Any suggestions/help is highly appreciated.
Thank you
I found the problem
So I just removed all the variable declarations from /etc/sysconfig/httpd and checked, the application was still able to access the lib files, so these were now redundant.
Then undid all variable declarations done earlier in .localsh and .localrc files for the os users. To start from scratch, and go step by step to see where it breaks.
So now, cx_Oracle was looking for the lib files in wrong directory
$ORACLE_HOME/client_1/lib
instead of
$ORACLE_HOME/lib
DPI-1047: Cannot locate a 64-bit Oracle Client library: "$ORACLE_HOME/client_1/lib/libclntsh.so: cannot open shared object file: No such file or directory". See https://cx-oracle.readthedocs.io/en/latest/user_guide/installation.html for help
I did not have any subfolder named "client_1" inside dbhome_1
so I just created a symlink client_1 that points to dbhome_1 (still unsure on this, but at least it works :) )
So, now, this error was gone but now again ORA-01804 was coming. 😑
I had read somewhere that this error can be fixed by adding "libociei.so" but I did not have one on my instance, so I generated it using these commands:-
mkdir -p $ORACLE_HOME/rdbms/install/instantclient/light
cd $ORACLE_HOME/rdbms/lib
make -f ins_rdbms.mk igenliboci
Then I just moved this libociei.so file from
$ORACLE_HOME/instantclient to $ORACLE_HOME/lib
Now there was a new error (so.. progress 😉 ):
ORA-12546 - TNS Permission Denied.
This was easy to solve 😀
I used this command to address this :-
setsebool -P httpd_can_network_connect on
And...... That was all! It worked.
We are running spark job which connect to oracle and fetch some data. Always attempt 0 or 1 of JDBCRDD task fails with below error. In subsequent attempt task get completed. As suggested in few portal we even tried with -Djava.security.egd=file:///dev/urandom java option but it didn't solved the problem. Can someone please help us in fixing this issue.
ava.sql.SQLRecoverableException: IO Error: Connection reset by peer, Authentication lapse 59937 ms.
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:794)
at oracle.jdbc.driver.PhysicalConnection.connect(PhysicalConnection.java:688)
Issue was with java.security.egd only. Setting it through command line i.e -Djava.security.egd=file:///dev/urandom was not working so I set it through system.setproperty with in job. After that job is no more giving SQLRecoverableException
This Exception nothing to do with Apache Spark ,"SQLRecoverableException: IO Error:" is simply the Oracle JDBC driver reporting that it's connection
to the DBMS was closed out from under it while in use. The real porblem is at
the DBMS, such as if the session died abruptly. Please check DBMS
error log and share with question.
Similer problem you can find here
https://access.redhat.com/solutions/28436
Fastest way is export spark system variable SPARK_SUBMIT_OPTS before running your job.
like this: export SPARK_SUBMIT_OPTS=-Djava.security.egd=file:dev/urandom I'm using docker, so for me full command is:
docker exec -it spark-master
bash -c "export SPARK_SUBMIT_OPTS=-Djava.security.egd=file:dev/urandom &&
/spark/bin/spark-submit --verbose --master spark://172.16.9.213:7077 /scala/sparkjob/target/scala-2.11/sparkjob-assembly-0.1.jar"
export variable
submit job
context: Gitlab 8 with external nginx and postgresql on Ubuntu 15.04. It all worked with Gitlab 7.10 and I started with a fresh install to avoid upgrade-problems.
In the gitlab.rb there is:
gitlab_rails['db_adapter'] = "postgresql"
gitlab_rails['db_encoding'] = "unicode"
gitlab_rails['db_database'] = "gitlabdb"
gitlab_rails['db_pool'] = 10
gitlab_rails['db_username'] = "gitlab"
When doing a reconfigure and "gitlab-rake gitlab:setup" there is no problem, and the database gets recreated. So far looking good. Unfortunately the page doesn't load and I get a 500 - the logfile tells me that it cannot login with the given password. I made the database accept all (without password) and then got to the weird error:
ActiveRecord::NoDatabaseError (FATAL: database "gitlabhq_production" does not exist
Nowhere in the config-files a database gitlabhq_production is mentioned, so I'm clueless here. Can you help out?
It was an old instance of Gitlab bugging. A reboot helped.
I downloaded and unziped the titan.zip and used the command ./titan.sh -v start. Now I get the output:
./titan.sh -v start
Forking Cassandra...
OpenJDK 64-Bit Server VM warning: The UseParNewGC flag is deprecated and will likely be removed in a future release
Running nodetool statusthrift.Error: Config file not found: /usr/lib64/jvm/java-1.9.0-openjdk-1.9.0/jre/conf/management/management.properties
...... timeout exceeded (60 seconds)
See /home/hausi/Documents/titan-0.5.4-hadoop2/bin/../log/cassandra.log for Cassandra log output.
The file management.properties does not exist on my machine. I could find any information about. Is it necessary to run Titan? How can I create it?
Little of topic bonus question: Since the company behind Titan was bought, will the database developmend be stopped?
It looks like you are running JDK9?
/usr/lib64/jvm/java-1.9.0-openjdk-1.9.0/jre/conf/management/management.properties
If I'm not misreading that, I think the answer is to downgrade to JDK7 or JDK8.
Since the company behind Titan was bought, will the database development be stopped?
The short answer is "no" and that development will continue. Please read:
https://groups.google.com/d/msg/aureliusgraphs/WTNYYpUyrvw/pZh02Q2LlpsJ
I have managed to set up Cassandra + Thrift and the Python wrapper for Thrift LazyBoy, and I have followed an example mentioned in the LazyBoy Wiki.After testing that example I'm getting an error with an exception.
cassandra.ttypes.InvalidRequestException: InvalidRequestException(why='Keyspace
UserData does not exist in this schema.')
here's the exception.I'm expecting some helping hand.
Thanks.
Make sure that the keyspace 'UserData' exists in your configuration file (conf/storage-conf.xml)
E.g
<Keyspaces>
<Keyspace Name="UserData">
....
</Keyspaces>
For those just starting out with Cassandra/Pycassa then maybe you've been working through this tutorial and you get stuck on the line
col_fam = pycassa.ColumnFamily(pool, 'Standard1')
with an error that looks like
pycassa.cassandra.ttypes.InvalidRequestException: InvalidRequestException(why='Keyspace Keyspace1 does not exist')
To resolve this, start Cassandra
bin/cassandra -f
And then in another terminal window load the sample schema using
bin/cassandra-cli -host localhost --file conf/schema-sample.txt
Then you should make it past that line in the tutorial.