During a massive data ingestion process, what mechanisms in Hadoop ensure data is not lost in case of system failure?
- Checkpointing
- Hadoop Distributed File System (HDFS) Federation
- Snapshotting
- Write-Ahead Logging (WAL)
Write-Ahead Logging (WAL) in Hadoop ensures data integrity during massive data ingestion. It records changes before they are applied, allowing recovery in case of system failure during the ingestion process.
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