baybatu

kubectl get svc --all-namespaces  -o go-template="{{range .items}}{{range.spec.ports}}{{if .nodePort}}{{.nodePort}}{{printf \"\n\"}}{{end}}{{end}}{{end}}" | sort

baybatu

package com.example;

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class CompleteableFutureWithExceptionHandling {

    public static void main(String[] args) {

baybatu

Bash commands connected using pipe(|) are not executed correctly in kubectl exec.

Example:

kubectl exec -ti <POD> -- pg_dump -h localhost -t my_table | psql -d <TARGET_DB> -h localhost

Here I want to run the pg_dump command first and redirect the output to the psql command as input using pipe(|). But kubectl takes commands only until pipe character, pg_dump in my case and psql has been run on host machine instead of inside the <POD>. The solution is to wrap all commands using double quote(") and run these commands using bash -c.

baybatu

The following stacktrace can occur on a spring-boot app. Consider changing the scope of dependencies that use groovy runtime as test.

{"@timestamp":"2022-11-03T12:32:33.865+03:00","@version":"1","message":"Application run failed","logger_name":"org.springframework.boot.SpringApplication","thread_name":"main","level":"ERROR","level_value":40000,"stack_trace":"java.lang.NoClassDefFoundError: Could not initialize class org.codehaus.groovy.reflection.ReflectionCache
    at org.codehaus.groovy.runtime.dgmimpl.NumberNumberMetaMethod.<clinit>(NumberNumberMetaMethod.java:33)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77)
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)

baybatu

Tablolarda tarih ve zamanı ayrı kolonlarda tutmak hatalı sorgulama yapma ihtimalini artırır. Arama için verilen bir zamanın değerini değiştirip arama yapılıyorsa bu durumda bug çıkma ihtimali var. Örnek tablo verisinin şu şekilde olduğunu düşünelim:

id	tarih	zaman
1	09/12/2021	23:50
2	09/12/2021	23:52
3	09/12/2021	23:55

baybatu

import asyncio
import functools

from schedule import Scheduler


class AsyncScheduler(object):
    """
        schedule (https://github.com/dbader/schedule) and asyncio integration example.
        Jobs are executed in asyncio event loop without blocking another tasks.

baybatu

Ilginc bir projeye benziyor. Prototipleme yaparken ya da hizlica bir seyleri denemek istedigimizde kullanilabilir.

https://github.com/pywebio/PyWebIO

baybatu

\copy (select column1, column2 from mytable) To '/tmp/dump.csv' With CSV DELIMITER ',' HEADER

baybatu

// usage: groovy nifi-test-el.groovy '${now():toNumber():minus(3999900000):format("yyyy-MM-dd HH:mm:ss", "GMT")}'
// source: https://community.cloudera.com/t5/Community-Articles/Testing-NiFi-Expression-Language-with-Groovy/ta-p/247208
@Grab(group='org.apache.nifi', module='nifi-expression-language', version='1.4.0')
import org.apache.nifi.attribute.expression.language.*

def cli = new CliBuilder(usage:'groovy testEL.groovy [options] [expressions]',
                          header:'Options:')
cli.help('print this message')
cli.D(args:2, valueSeparator:'=', argName:'attribute=value',
       'set value for given attribute')

baybatu

SHOW CREATE TABLE tableName;

source: https://prestodb.io/docs/current/sql/show-create-table.html#examples