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Cloud computing: Redefining IT over the past year, cloud computing exploded, including a variety of applications-such as Salesforce CRM and Google apps-and services-such as hosting Amazon elastic Compute Cloud (Amaz On EC2) ibm®db2®, Google ...

Intermediary transaction http://www.aliyun.com/zixun/aggregation/6858.html ">seo diagnose Taobao guest cloud host technology Hall in the Web development, some systems require the same user at the same time to log on only once, 　　That is, if a user has logged in, if you log in before exiting, you need to error. The common approach is to determine whether the user is already in the creator when the user logs in, ...

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After completing the four basic learning steps of Apache Cassandra, you can try the actual code. If necessary, it is recommended to briefly review: Apache Cassandra Learning Step (1) Apache Cassandra Learning Ste ...

1. HQueue profile HQueue is a set of distributed, persistent message queues developed by hbase based on the search web crawl offline Systems team. It uses htable to store message data, HBase coprocessor to store the original keyvalue data in the message data format, and encapsulates the HBase client API for message access based on the HQueue client API. HQueue can be effectively used in the need to store time series data, as MAPR ...

This article describes the use of java iterators to traverse ArrayList collections, Set collections, and Map collections.

1, namenode Start load metadata scenario analysis Namenode function call Fsnamesystemm read dfs.http://www.aliyun.com/zixun/aggregation/11696.html "> Namenode.name.dir and Dfs.namenode.edits.dir build Fsdirectory. Fsimage class Recovertransitionread and ...

This article is my second time reading Hadoop 0.20.2 notes, encountered many problems in the reading process, and ultimately through a variety of ways to solve most of the. 　　Hadoop the whole system is well designed, the source code is worth learning distributed students read, will be all notes one by one post, hope to facilitate reading Hadoop source code, less detours. 1 serialization core Technology The objectwritable in 0.20.2 version Hadoop supports the following types of data format serialization: Data type examples say ...

To use Hadoop, data consolidation is critical and hbase is widely used. In general, you need to transfer data from existing types of databases or data files to HBase for different scenario patterns. The common approach is to use the Put method in the HBase API, to use the HBase Bulk Load tool, and to use a custom mapreduce job. The book "HBase Administration Cookbook" has a detailed description of these three ways, by Imp ...

Http://www.aliyun.com/zixun/aggregation/13713.html ">hbase coprocessor is one of the great expectations that many people have for hbase-0.92. It enables off-line analysis and online applications to be well integrated, and also greatly expands the application richness of hbase and is no longer a simple K class application. The design of HBase coprocessor from hbase-2000 and HBase-...