suyue created IOTDB-144:
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Summary: MetaData cache in query
Key: IOTDB-144
URL: https://issues.apache.org/jira/browse/IOTDB-144
Project: Apache IoTDB
Issue Type: Improvement
Reporter: suyue
To increase query speed, metadata needs to be cached, including TsFileMetaData
and TsDeviceMetaData.
The files in IOTDB are organized according to time, so the query frequency of
different files varies greatly. Cache metadatas of frequently queried files can
reduce the time of reading metaData from disk. Besides, all sensors' metadata
of a device is in TsDeviceMetaData. In order to read the metadata of a sensor,
we need to read the entire TsDeviceMetaData. In the current version, querying
multiple sensors in a device simultaneously need to read TsDeviceMetaData
multiple times, so consider caching TsDeviceMetaData.
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