2013-09-16 17:49:36 -04:00
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2013-09-26 19:22:28 -04:00
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2013-09-16 17:49:36 -04:00
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2013-09-13 18:20:39 -04:00
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Concepts and Terminology
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========================
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2013-09-27 20:08:34 -04:00
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* **Aggregators**: A mechanism for combining records during realtime incremental indexing, Hadoop batch indexing, and in queries.
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* **DataSource**: A table-like view of data; specified in a "specFile" and in a query.
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* **Granularity**: The time interval corresponding to aggregation by time.
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* **indexGranularity**: specifies the granularity used to bucket timestamps within a segment.
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* **segmentGranularity**: specifies the granularity of the segment, i.e. the amount of time a segment will represent
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* **Segment**: A collection of (internal) records that are stored and processed together.
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* **Shard**: A sub-partition of the data in a segment. It is possible to have multiple segments represent all data for a given segmentGranularity.
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* **specFile**: is specification for services in JSON format; see [Realtime](Realtime.html) and [Batch-ingestion](Batch-ingestion.html)
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