Otsuka Tajima Midori mid0111

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JavaScript Value	JavaScript Type	Java Type	Is Scriptable	Is Function
`{a:1, b:['x','y']}`	`object`	`org.mozilla.javascript.NativeObject`	+	-
`[1,2,3]`	`object`	`org.mozilla.javascript.NativeArray`	+	-
`1`	`number`	`java.lang.Double`	-	-
`1.2345`	`number`	`java.lang.Double`	-	-
`NaN`	`number`	`java.lang.Double`	-	-
`Infinity`	`number`	`java.lang.Double`	-	-
`-Infinity`	`number`	`java.lang.Double`	-	-
`true`	`boolean`	`java.lang.Boolean`	-

-

下書き

Jacksonとは

JacsonはJSON(JavaScript Object Notation)と呼ばれるデータ記述言語を扱うためのJavaライブラリ。

ウェブアプリケーション開発ではJSONが必須の技術になってきている。 JavaでJSONを扱うためのAPIがJava EE 7に含まれる予定。JSR 343として仕様策定中。

Yesterday I upgraded our running elasticsearch cluster on a site which serves a few million search requests a day, with zero downtime. I've been asked to describe the process, hence this blogpost.

To make it more complicated, the cluster was running elasticsearch version 0.17.8 (released 6 Oct 2011) and I upgraded it to the latest 0.19.10. There have been 21 releases between those two versions, with a lot of functional changes, so I needed to be ready to roll back if necessary.

Our setup:

elasticsearch

We run elasticsearch on two biggish boxes: 16 cores plus 32GB of RAM. All indices have 1 replica, so all data is stored on both boxes (about 45GB of data). The primary data for our main indices is also stored in our database. We have a few other indices whose data is stored only in elasticsearch, but are updated once daily only. Finally, we store our sessions in elasticsearch, but active sessions are cached in memcached.

componentについて

componentはWebアプリ向けのパッケージ管理システムです。 componentではGithubのリポジトリをパッケージとして扱います。

例えば、ボタンをクリックすると"Hello, world!"を表示するような簡単なアプリをかいてみます。

component createコマンドでプロジェクトを作成します。今回はGithub上に配置する予定は無いので--localオプションをつけています。

$ component create --local hello-world

	var express = require('express');
	var sys = require('sys');
	var oauth = require('oauth');

	var app = express.createServer();

	var _twitterConsumerKey = "YOURTWITTERCONSUMERKEY";
	var _twitterConsumerSecret = "YOURTWITTERCONSUMERSECRET";

	function consumer() {

	# [Thu Jun 9 17:00:23 2011] Protocol: http, Server: 192.168.5.103:9200
	curl -XPUT 'http://127.0.0.1:9200/test/?pretty=1'

	# [Thu Jun 9 17:00:23 2011] Response:
	# {
	# "ok" : true,
	# "acknowledged" : true
	# }

	# [Thu Jun 9 17:00:31 2011] Protocol: http, Server: 192.168.5.103:9200

	cd ~
	sudo yum update
	sudo yum install java-1.7.0-openjdk.i686 -y

	wget https://github.com/downloads/elasticsearch/elasticsearch/elasticsearch-0.19.9.tar.gz -O elasticsearch.tar.gz

	tar -xf elasticsearch.tar.gz
	rm elasticsearch.tar.gz
	mv elasticsearch-* elasticsearch
	sudo mv elasticsearch /usr/local/share

	/*
	* Licensed to Jörg Prante and xbib under one or more contributor
	* license agreements. See the NOTICE.txt file distributed with this work
	* for additional information regarding copyright ownership.
	*
	* Copyright (C) 2012 Jörg Prante and xbib
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as published
	* by the Free Software Foundation; either version 3 of the License, or

	import java.util.ArrayList;
	import java.util.List;

	import org.easymock.EasyMock;
	import org.easymock.IExpectationSetters;
	import org.json.JSONArray;
	import org.json.JSONObject;

	import twitter4j.Paging;
	import twitter4j.RateLimitStatus;