It's relatively easy to scale out stateless web applications. You often only need a reverse proxy. But for those stateful web applications, especially those applications that embeds websocket services in them, it's always a pain to distribute them in a cluster. The traditional way is introducing some external services like Redis to handle pubsub, however, in such way, you often need to change your code. Can Erlang/Elixir, the "concurrency oriented programming languages", best other languages in this use case? Has Phoenix framework already integrated the solution of horizontally scaling websocket? I'll do an experiment to prove (or disprove) that.
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CREATE TABLE public.vouchers ( | |
id serial PRIMARY KEY, | |
name text NOT NULL | |
); | |
INSERT INTO vouchers | |
(name) | |
VALUES | |
('Sales'), | |
('Purchase'), |
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package main | |
import ( | |
"crypto/rand" | |
"encoding/base64" | |
"io" | |
"log" | |
"net/http" | |
"time" |
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-- Simply set the offset to the amount of rows you want to keep. An index of (id, date desc) will make this fast. | |
delete from some_table st | |
using ( | |
select distinct | |
x.id, | |
x.date | |
from some_table st1 | |
join lateral ( |
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#!/bin/bash | |
me=$(basename $0) | |
set -e # exit on error | |
function print_help { | |
echo | |
echo $me - create a virtualenv with relative paths in a certain buildroot and fix the relative path to make it work after install | |
echo | |
echo OPTIONS | |
echo " -h / --help" |
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# permanent apple keyboard keyswap | |
echo "options hid_apple swap_opt_cmd=1" | sudo tee -a /etc/modprobe.d/hid_apple.conf | |
update-initramfs -u -k all | |
# Temporary & instant apple keyboard keyswap | |
echo '1' | sudo tee -a /sys/module/hid_apple/parameters/swap_opt_cmd | |
# Windows and Mac keyboards - GUI (Physical Alt is Ctrl, Physical Super is Alt, Physical Ctrl is Super) | |
setxkbmap -option;setxkbmap -option altwin:ctrl_alt_win |
Kafka 0.11.0.0 (Confluent 3.3.0) added support to manipulate offsets for a consumer group via cli kafka-consumer-groups
command.
- List the topics to which the group is subscribed
kafka-consumer-groups --bootstrap-server <kafkahost:port> --group <group_id> --describe
Note the values under "CURRENT-OFFSET" and "LOG-END-OFFSET". "CURRENT-OFFSET" is the offset where this consumer group is currently at in each of the partitions.
- Reset the consumer offset for a topic (preview)
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sudo rm -rfv /Library/Caches/com.apple.iconservices.store; sudo find /private/var/folders/ \( -name com.apple.dock.iconcache -or -name com.apple.iconservices \) -exec rm -rfv {} \; ; sleep 3;sudo touch /Applications/* ; killall Dock; killall Finder |
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# one or the other, NOT both | |
[url "https://github"] | |
insteadOf = git://github | |
# or | |
[url "git@github.com:"] | |
insteadOf = git://github |
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#!/bin/sh | |
# certs.sh | |
# use this for Yocto/Edison: | |
LIB=lib | |
# use this for WRLinux/Gateway | |
# LIB=lib64 | |
if [ -f /usr/$LIB/jvm/java-8-openjdk/jre/lib/security/cacerts ]; then | |
mv /usr/$LIB/jvm/java-8-openjdk/jre/lib/security/cacerts \ |
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