Arraylist Class

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Java Foundation 8: Java Iterator and foreach loops

Java Iterator is an interface that provides only the basic rules for iteration, and a foreach loop can be used for any container that implements the Iterable interface.

Apache Cassandra Learning Step (5): Actual Jtwissandra Project-it

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 ...

HDFs metadata Parsing

1, metadata (Metadata): Maintenance of HDFs file System file and directory information, divided into memory metadata and metadata file two kinds. Namenode maintains the entire metadata. HDFs implementation, the method of periodically exporting metadata is not adopted, but the backup mechanism of metadata mirroring file (fsimage) + day file (edits) is adopted. 2, Block: The contents of the file. Search path Flow: &http://www.aliyun.com/zixun/aggregation/37 ...

Hadoop Serialization System

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 ...

Traversing collection data using Java iterators

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

Detailed description of Iterable and Iterator in java

Iterator and iterable objects in Java. Let's take a look at the difference between these two objects and how to implement the for each loop in a custom class.

Java iterators -- Iterator and Iterable interfaces

Java iterator is mainly used to manipulate collection objects in java. Java provides an iterator interface Iterator. Iterator can only move forward and cannot be rolled back.

The mechanism of the data backup scheme of Hadoop

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 ...

Deep understanding of Java iterators

Java Iterable interface and the Iterator interface. The class that implements the Iterable interface is iterable; the class that implements the Iterator interface is an iterator.

Hive (VI.) extended characteristics of –hive

Hive is a very open system, many of which support user customization, including: File format: Text file,sequence file in memory format: Java integer/string, Hadoop intwritable/text User-supplied Map/reduce script: In any language, use Stdin/stdout to transmit data user-defined functions: Substr, Trim, 1–1 user-defined poly ...

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