rajcspsg

1. miner.start(true)
2. miner.stop()
3. eth.blockNumber (this returns the id of last/latest block of ethereum)
4. eth.getBalance (to view the miner's account balance)
5. eth.getBlock(eth.blockNumber).miner (returns the id of the last/latest block miner)
6. eth.getBalance(eth.getBlock(eth.blockNumber).miner)

rajcspsg

https://www.youtube.com/watch?v=zphcsoSJMvM
1. single threaded process

2. co-operative multi tasking
    Application running on the operating system should yield the OS. 
    Once the application has yielded then the OS run the other tasks.
    This has a big flaw if the application doesn't yield, then the OS will wait for long time.

3. pre-emptive multi tasking 

rajcspsg

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>com.mycompany</groupId>
		<artifactId>adserving</artifactId>
		<version>4.7.2</version>
		<relativePath>..</relativePath>
	</parent>

rajcspsg

$ cat /home/vagrant/hs_err_pid5124.log
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 536870912 bytes for committing reserved memory.
# Possible reasons:
#   The system is out of physical RAM or swap space
#   In 32 bit mode, the process size limit was hit
# Possible solutions:
#   Reduce memory load on the system
#   Increase physical memory or swap space

rajcspsg

stat("/tmp/_MEInfj5pi/botocore/data/appmesh/2019-01-25", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
openat(AT_FDCWD, "/tmp/_MEInfj5pi/botocore/data/appmesh/2019-01-25", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 7
fstat(7, {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
getdents(7, /* 4 entries */, 32768)     = 128
stat("/tmp/_MEInfj5pi/botocore/data/appmesh/2019-01-25/paginators-1.json", {st_mode=S_IFREG|0700, st_size=996, ...}) = 0
unlink("/tmp/_MEInfj5pi/botocore/data/appmesh/2019-01-25/paginators-1.json") = 0
stat("/tmp/_MEInfj5pi/botocore/data/appmesh/2019-01-25/service-2.json", {st_mode=S_IFREG|0700, st_size=110890, ...}) = 0
unlink("/tmp/_MEInfj5pi/botocore/data/appmesh/2019-01-25/service-2.json") = 0
getdents(7, /* 0 entries */, 32768)     = 0
close(7)                                = 0

rajcspsg

package com.technorati.openrtb.model;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;
import com.fasterxml.jackson.annotation.JsonInclude.Include;
import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;
import org.apache.commons.lang.builder.ToStringBuilder;

rajcspsg

// Generated by the protocol buffer compiler.  DO NOT EDIT!
// source: main/proto/datamodel.proto

package part2;

public final class Datamodel {
  private Datamodel() {}
  public static void registerAllExtensions(
      com.google.protobuf.ExtensionRegistryLite registry) {
  }

rajcspsg

[vagrant@master docker-hadoop-master]$ docker service logs hadoop_datanode   
            hadoop_datanode.0.bwruqadoq28r@master.com    | Configuring core
            hadoop_datanode.0.bwruqadoq28r@master.com    |  - Setting hadoop.proxyuser.hue.hosts=*
            hadoop_datanode.0.bwruqadoq28r@master.com    |  - Setting fs.defaultFS=hdfs://namenode:9000
            hadoop_datanode.0.bwruqadoq28r@master.com    |  - Setting hadoop.http.staticuser.user=root
            hadoop_datanode.0.bwruqadoq28r@master.com    |  - Setting io.compression.codecs=org.apache.hadoop.io.compress.SnappyCodec
            hadoop_datanode.0.bwruqadoq28r@master.com    |  - Setting hadoop.proxyuser.hue.groups=*
            hadoop_datanode.0.bwruqadoq28r@master.com    | Configuring hdfs
            hadoop_datanode.0.bwruqadoq28r@master.com    |  - Setting dfs.datanode.data.dir=file:///hadoop/dfs/data
            hadoop_datanode.0.bwruqadoq28r@master.com    |  - Setting dfs.namenode.datanode.registration.ip-hostname-check=false

rajcspsg

managers=3
workers=3
for node in $(seq 1 $managers); do echo "======> Creating manager$node machine ..."; docker-machine create -d virtualbox manager$node; done
for node in $(seq 1 $workers); do echo "======> Creating worker$node machine ..."; docker-machine create -d virtualbox worker$node; done
docker-machine ssh manager1 "docker swarm init --listen-addr $(docker-machine ip manager1) --advertise-addr $(docker-machine ip manager1)"
export manager_token=`docker-machine ssh manager1 "docker swarm join-token manager -q"`
export worker_token=`docker-machine ssh manager1 "docker swarm join-token worker -q"`
for node in $(seq 2 $managers); do echo "======> manager$node joining swarm as manager ..."; docker-machine ssh manager$node "docker swarm join --token $manager_token --listen-addr $(docker-machine ip manager$node) --advertise-addr $(docker-machine ip manager$node) $(docker-machine ip manager1)"; done
for node in $(seq 1 $workers); do echo "======> worker$node joining swarm as worker ..."; docker-machine ssh w

rajcspsg

;; -*- mode: emacs-lisp -*-
;; This file is loaded by Spacemacs at startup.
;; It must be stored in your home directory.

(defun dotspacemacs/layers ()
  "Configuration Layers declaration.
You should not put any user code in this function besides modifying the variable
values."
  (setq-default