HBase设计模式：构建可扩展应用

HBase

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Preface

[ 3 ]

A block of code is set as follows:

private void generate(int nUsers, int nEmails) throws IOException {

SimpleDateFormat dateFormat = new SimpleDateFormat

("yyyy-MM-dd HH:mm:ss");

new File(Util.ROOT_DIR).mkdirs();

Charset charset = Charset.forName("US-ASCII");

if (nEmails < 1) {

nEmails = 1;

}

Any command-line input or output is written as follows:

./sqlline.sh localhost $HBASE_BOOK_HOME/generated/users.txt

New terms and important words are shown in bold. Words that you see on the

screen, for example, in menus or dialog boxes, appear in the text like this: "Also,

you can see how Start Key and End Key, we specied, are showing up."

Warnings or important notes appear in a box like this.

Tips and tricks appear like this.

Reader feedback

Feedback from our readers is always welcome. Let us know what you think about

this book—what you liked or disliked. Reader feedback is important for us as it

helps us develop titles that you will really get the most out of.

To send us general feedback, simply e-mail

feedback@packtpub.com, and mention

the book's title in the subject of your message.

If there is a topic that you have expertise in and you are interested in either writing

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Customer support

Now that you are the proud owner of a Packt book, we have a number of things

to help you to get the most from your purchase.

Starting Out with HBase

[ 6 ]

The simplest way to get HBase up and running takes only a few minutes, and it is so

easy that it will almost feel like a cheat, but it's not—you will have a complete HBase

development environment.

However, we cannot leave you there. If all you know is building toy clusters, even

your most sophisticated HBase design will not command full authority. A pilot

needs to know his plane inside out. That is why we will continue with larger and

larger cluster installs until you are able to store the planet's data.

Now follow these steps:

1. Download Kiji from

http://www.kiji.org/.

2. Source their environment as per the instructions.

3. Start the cluster.

4. Download Apache Phoenix from

http://phoenix.apache.org/download.

html

, copy its JAR le into the HBase lib directory, and restart the cluster.

Presto! You now have a full HBase development environment that will last you until

the end of the book. But remember, to be taken seriously, you need to read till the

end and build your clusters.

Installing HBase

The rst thing that you need to do when learning to deal with HBase is to install it.

Moreover, if you are in any way serious about using HBase, you will want to run it,

not on a machine, but on a cluster.

Devops (development and operations) is a modern trend in software development

that stresses communication, collaboration, and integration between software

developers and information technology professionals. It blurs the distinction

between a developer and an administrator.

You will have to live up to this movement in person, by doing what is called

Build Your Own Clusters (BYOC). Developers will do well by learning what

administrators know, at least to some degree, and the same is true about

administrators learning about what developers do.

Why is that? This is primarily because efciency is the name of the game. The reason

you choose a NoSQL solution in the rst place is for efciency. Your thoughts around

the design will be all around efciency, that is, the design of the keys, the tables, and

the table families. In fact, with NoSQL, you are, for the rst time, given the means

of reasoning about the efciency of your solutions, to quote from the Google paper on

BigTable, while doing the logical layout of your data.

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HBase设计模式：构建可扩展应用

Architecting HBase Applications&HBase;.Design.Patterns两本书

HBase Design Patterns

hbase org.apache.hadoop.hbase.tool.LoadIncrementalHFiles 命令

MetaException(message:org.apache.hadoop.hive.serde2.SerDeException Error: hbase.columns.mapping missing for this HBase table.)

import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.*; import org.apache.hadoop.hbase.client.*; import org.apache.hadoop.hbase.util.Bytes;

hbase的hbase.rootdir是什么意思

ERROR: org.apache.hadoop.hbase.PleaseHoldException: Master is initializing

HBASE_CONFIG.set("hbase.zookeeper.property.clientPort", "2181");

HBase的数据目录是由hbase.rootdir配置选项指定的，如果不配置会怎样

hbase.zookeeper.quorum

hbase.regionserver.hfilecleaner.large.thread.count

hbase.regionserver.hfilecleaner.small.thread.count

hbase.client.write.buffer

at org.apache.hadoop.hbase.master.ServerManager.getInfoPort(ServerManager.java:1029) at org.apache.hadoop.hbase.master.HMaster.getRegionServerInfoPort(HMaster.java:2675)报错

conf.set("hbase.rootdir" 在哪个目录

import org.apache.hadoop.hbase.mapreduce.TableInputFormat; 需要导入的pom文件

org.apache.hadoop.hive.hbase.hbasestoragehandler

最新资源

import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.; import org.apache.hadoop.hbase.client.; import org.apache.hadoop.hbase.util.Bytes;