Org Apache Hadoop Common
org.apache.hadoop.common
is a Java package within the Apache Hadoop project. Hadoop is an open-source framework for distributed storage and processing of large datasets, and the org.apache.hadoop.common
package is part of the Hadoop Common module. Here’s a brief overview of what it typically contains and its role within the Hadoop project:
Common Utilities:
- The
org.apache.hadoop.common
package typically contains common utility classes and functions used across various components of the Hadoop ecosystem. - These utilities are shared among different Hadoop modules, making it easier to maintain and extend the Hadoop project.
- The
Configuration Management:
- Hadoop uses a central configuration system to manage settings and properties for various components. The
Configuration
class, often found withinorg.apache.hadoop.conf
, is frequently used and may be part of the common package. - This package may contain classes and methods related to reading, writing, and managing Hadoop configuration settings.
- Hadoop uses a central configuration system to manage settings and properties for various components. The
Logging and Logging Configuration:
- Hadoop relies on Apache Log4j or other logging frameworks for logging and debugging purposes.
- The common package may include classes related to setting up and configuring logging for Hadoop components.
Exception Handling:
- Exception classes and error handling mechanisms are often part of the common package.
- Hadoop components throw and catch exceptions defined in this package to handle various runtime errors.
Other Shared Utilities:
- Various utility classes related to I/O operations, file handling, network communication, and more may be part of this package.
- These utilities are designed to be reused across different Hadoop components, such as HDFS (Hadoop Distributed File System), YARN (Yet Another Resource Negotiator), MapReduce, and others.
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