How to queue the number of jobs in Apache Livy
How to queue the number of jobs in Apache Livy
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I have a problem with Apache Airflow Logging. My Airflow cluster has one Webserver, one Scheduler and five Workers Celery. All Workers working usually but only four Workers can fetch the log, one worker cant fetch the record with error: "Failed to fetch log file from the worker. Client error '404 NOT FOUND' for URL". I checked /etc/hosts file, this is ok and have hostname. Please help me. Thank you very much <3 <3
In Corda, the node operator is able to issue commands to their node over RPC using the CordaRPCOps interface. But there does not appear to be an RPC command for stopping or restarting a node.
How can I stop or restart the node remotely?
As of Corda 3, there is no way to remotely shut down or restart a node. If possible, you can use SSH instead (e.g. ssh user#host systemctl stop).
Corda 4 introduces CordaRPCOps.shutdown, which shuts the node down immediately without waiting for flows to finish. You should perform a flow drain before invoking this RPC operation.
I am currently setup airflow scheduler in Linux server A and airflow web server in Linux server B. Both server has no Internet access. I have start the initDB in server A and keep all the dags in server A.
However, when i refresh the webserver UI, it keep having error message:-
This DAG isn't available in the webserver DagBag object
How do i configure the dag folder for web server (server B) to read the dag from scheduler (server A)?
I am using bashoperator. Is that Celery Operator is a must?
Thanks in advance
The scheduler has found your dags_folder, and its processes, and is scheduling them accordingly. The webserver however can "see" these processes solely by their existence in the database but can't find them in its dags_folder path.
You need to ensure that the dags_folder for both servers contain the same files, and that both are kept in sync with one another. This is out of scope for Airflow and it won't handle this on your behalf.
I developed a nginx module to connect zookeeper, but I find the threads that created on zookeeper init were killed by nginx. When I debug by gdb with 'info threads', it only shows one thread, but it should be three threads. Why is this and how can I solve it?
I have deployed an "helloworld" service on cloudify 2.7 and OpenStack cloud. I would stop the service tomcat without the service is being restarted.
So, in the cloudify shell I have execute:
cloudify#default> connect cloudify-manager-1_IP
Connected successfully
cloudify#default> use-application helloworld
Using application helloworld
cloudify#helloworld> invoke tomcat cloudify:start-maintenance-mode 60
Invocation results:
1: OK from instance #1#tomcat_IP, Result: agent failure detection disabled successfully for a period of 60 minutes
invocation completed successfully
At this point, I have connected via ssh into the tomcat VM and ran:
CATALINA_HOME/bin/catalina.sh stop
In the CATALINA_HOME/log/catalina.out I can see that the app server is being stopped and immediately restarted!
So, what should I do in order to stop the app server and restart it only when I decide to restart it?
Maintenance mode in Cloudify 2.7 is used to prevent the system from starting a new VM if a service VM has failed.
What you are looking for is to prevent Cloudify from auto-healing a process - Cloudify checks for the liveness of the configured process, and if it dies, it executes the 'start' lifecycle again.
In your case, the monitored process can change, since you will be restarting it manually. So you should not use the default process monitoring. There is a similar question here: cloudify 2.7 locator NO_PROCESS_LOCATORS