The Bundle job is a special type of Oozie job designed to run workflows based on time and data triggers. It allows you to schedule and manage the execution of multiple workflows in a coordinated manner.

In Big Data, 'Veracity' refers to the trustworthiness and reliability of data, ensuring that data is accurate and can be trusted for analysis.

The default block size in HDFS for Hadoop 2.x and later versions is 128 MB. This block size is a critical parameter influencing data distribution and storage efficiency in the Hadoop Distributed File System.

The 'COGROUP' operation in Apache Pig is significant for data grouping. It groups data from multiple relations based on a common key, creating a new relation with grouped data. This operation is crucial for aggregating and analyzing data from different sources in a meaningful way.

In real-time data transformation scenarios, Apache Storm is a suitable Hadoop ecosystem component. Apache Storm is designed for processing streaming data in real-time, making it effective for continuous and low-latency data transformations in Hadoop environments.

In Java, the JobConf class is essential for configuring and executing Hadoop jobs. It allows developers to specify job-related parameters and settings for MapReduce tasks.

Advanced Hadoop administration involves the use of SSL/TLS for securing data transfers within the cluster. Implementing secure socket layer (SSL) or transport layer security (TLS) protocols helps encrypt data during transit, ensuring the confidentiality and integrity of sensitive information.

In Hadoop, the Snappy compression codec is often used for its splittable property, enabling efficient parallel processing. Snappy is known for its fast compression and decompression speed, making it suitable for big data applications where performance is crucial.

In Hadoop, Scalability is a critical aspect to test when dealing with large-scale data processing. It refers to the system's ability to handle increasing amounts of data and workloads effectively, ensuring that it can scale horizontally to accommodate growing datasets.

The best approach for ingesting and analyzing log data from multiple sources in a Hadoop pipeline is to use Apache Flume. Flume is designed for efficient, reliable, and scalable data ingestion, making it suitable for handling log data streams.

Apache Pig is utilized for complex data transformation and analysis in Hadoop. It allows users to write scripts using a high-level scripting language called Pig Latin, making it easier to process and analyze large datasets.

Visualization tools are commonly used for visualizing Hadoop cluster metrics and logs. These tools provide insights into the performance and health of the Hadoop cluster, helping administrators identify issues and optimize performance.