Begin addressing PR feedback
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@ -24,23 +24,12 @@ Major topics include:
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* [Time-Structed Merge Tree (TSM)](#time-structured-merge-tree-tsm)
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* [Time Series Index (TSI)](#time-series-index-tsi)
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{{% note %}}
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##### At a glance: changes to the InfluxDB storage engine from 1.x to 2.0
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- The InfluxDB 2.0 storage engine no longer partitions data into shards by time.
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- **Buckets** replace databases and retention policies.
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- Only TSI is used. There is no more in-memory index.
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- The configuration interface and options have changed. Configuration options are not currently exposed, but will be.
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Read about the [v1 storage engine](https://docs.influxdata.com/influxdb/v1.7/concepts/storage_engine).
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{{% /note %}}
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## Writing data: from API to disk
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The storage engine handles data from the point an API request is received through writing it to the physical disk.
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Data is written to InfluxDB using [Line protocol](/) sent via HTTP POST request to the `/write` endpoint.
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Batches of points are sent to InfluxDB.
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Those batches are compressed and written to a WAL for immediate durability.
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The points are also written to an in-memory cache so that newly written points are immediately queryable.
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Batches of [points](/v2.0/reference/glossary/#point) are sent to InfluxDB, compressed, and written to a WAL for immediate durability.
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The points are also written to an in-memory cache and become immediately queryable.
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The cache is periodically written to disk as TSM files.
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As TSM files accumulate, they are combined and compacted into higher level TSM files.
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