anhtranbk

Semantic Commit Messages

See how a minor change to your commit message style can make you a better programmer.

Format: <type>(<scope>): <subject>

<scope> is optional

Example

anhtranbk

Kafka Topics

List existing topics

bin/kafka-topics.sh --zookeeper localhost:2181 --list

Describe a topic

bin/kafka-topics.sh --zookeeper localhost:2181 --describe --topic mytopic

Purge a topic

bin/kafka-topics.sh --zookeeper localhost:2181 --alter --topic mytopic --config retention.ms=1000

... wait a minute ...

anhtranbk

Features	Java	Scala	Python	Golang	C++
Type Inference	No	Yes	Yes	Yes	No
Function	Must be in class	Must be in class or object. Function is first-class object	Can be at anywhere. Function is object	Always outside struct. Function is object	Can be at any where
Optional parameters	No	Yes	Yes	No	No
Tuple	No	Full-features include unpack	Full-features include unpack	No	No
Multiple return values	No	Support via tuple, must pack/unpack manually	Support auto pack/unpack via tuple	Support but return value is not first-class object like tuple in Scala/Python	No
Class	Support	Support	Missing scope-limit feature (private/protected), final method	Do not have class, only have term struct, support ony some basic features when extends struct (updating...)	Support
Class constructor	Standard OOP	Constructor is in the class signature, contructor overload via

anhtranbk

anhtranbk

FROM ubuntu:16.04

RUN apt-get update -y
RUN apt-get install -y openssh-server wget bzip2 htop net-tools tmux

RUN mkdir /var/run/sshd
RUN echo 'root:admin!2346' | chpasswd
RUN sed -i 's/PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config

# SSH login fix. Otherwise user is kicked off after login

anhtranbk

version: "3"

services:
  vote:
    build: ./vote
    command: python app.py
    volumes:
     - ./vote:/app
    ports:
      - "5000:80"

anhtranbk

#!/bin/bash

export SPARK_HOME=/usr/hdp/2.6.3.0-235/spark2
export OUTPUT_PATH=/user/anhtn/sampling/friends2
hdfs dfs -rm -r -f ${OUTPUT_PATH}

$SPARK_HOME/bin/spark-submit \
	--master yarn \
	--deploy-mode client \
	--driver-memory 1g \

anhtranbk

# /usr/lib/systemd/system/mongod.service

# file size
LimitFSIZE=infinity
# cpu time
LimitCPU=infinity
# virtual memory size
LimitAS=infinity
# open files
LimitNOFILE=64000

anhtranbk

Lỗi:

Traceback (most recent call last):
  File "/usr/bin/pip", line 9, in <module>
    from pip import main
ImportError: cannot import name main

khi gọi: sudo pip install trên Ubuntu sau khi update pip lên bản 10.x.

anhtranbk

create 'g3:edges', {NAME => 'cf', COMPRESSION => 'SNAPPY', BLOCKCACHE => 'true', IN_MEMORY => 'true'}, {SPLITS => ['012', '024', '036', '048', '060', '072', '084', '096', '108', '120', '132', '144', '156', '168', '180', '192', '204', '216', '228', '240', '252'], DURABILITY => 'ASYNC_WAL'}