Boolean Code

Do not do this anymore: public boolean foo () {if (true) {return true;} else {return false;}} Every time I dig into an open source project, I see that it's probably written by some expert I've been amazed at the code reviewed by experienced professionals and no one at all stopped the developer from randomly placing return statements in this method. Please tell me, it is very difficult to write the code below ... public b ...

Nutch Index Source Code Analysis (i) blog Category: Large data processing Research Nutchsolrhadoop index Nutch Integration Slor Index Method Introduction/** * indexing * @param solrurl SOLR web address * @param CRA WLDB Crawl db storage path: \crawl\crawldb ...

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Reminder: If idear or eclipse to run under the IDE you must use the directory on the HDFS to assign permissions to users under windows, for convenience, to all permissions recommended 777 create a directory command hdfs dfs-mkdir myproject Assign permissions command hdfs dfs-chmod 777 myproject HDFS CRUD tools hdfs; import org.apache.had ...

Blog Description: 1, research version hbase 0.94.12;2, posted source code may be cut, only to retain the key code. 　　Discusses the HBase write data process from the client and server two aspects. One, client-side 1, write data API write data is mainly htable and batch write two API, the source code is as follows://write the API public void to put ("final") throws IO ...

There is a concept of an abstract file system in Hadoop that has several different subclass implementations, one of which is the HDFS represented by the Distributedfilesystem class. In the 1.x version of Hadoop, HDFS has a namenode single point of failure, and it is designed for streaming data access to large files and is not suitable for random reads and writes to a large number of small files. This article will explore the use of other storage systems, such as OpenStack Swift object storage, as Ha ...

Imap_fetchstructure Gets the structure information of a letter. Syntax: array imap_fetchstructure (int imap_stream, int msg_number); Return value: Array function type: http://www.aliyun.com/zixun/aggregation/32416.html > Network system Content Description This function can read the specified letter ...

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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 ...

Hadoop RPC communication is different from other systems RPC communication, the author for the use of Hadoop features, specifically designed a set of RPC framework, the framework of personal feeling is still a little complicated. So I'm going to split into client-side and Server service-side 2 modules for analysis. If you have a good understanding of RPC's entire process, you must be able to understand it very quickly for Hadoop RPC. OK, let's cut to the chase. The related code for the RPC of Hadoop is ORG.APAC ...