[To rel/0.13][IOTDB-4364]Reduce read amplication in compaction#7301
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THUMarkLau merged 3 commits intoapache:rel/0.13from Sep 15, 2022
Merged
[To rel/0.13][IOTDB-4364]Reduce read amplication in compaction#7301THUMarkLau merged 3 commits intoapache:rel/0.13from
THUMarkLau merged 3 commits intoapache:rel/0.13from
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choubenson
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THUMarkLau
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Sep 14, 2022
This was referenced Apr 3, 2023
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Description
In massive timeseries scenarios, each device has 20 timeseries, and each file has tens of thousands of devices, that is, millions of timeseries. Read throughput in cross compaction is 100~1000 times greater than write throughput.
Solution
When compacting, it is necessary to obtain devices and timeseries from all source files, as well as the metadata of each timeseries. To avoid traversing the Zesong tree multiple times, we record the intermediate nodes of the Zesong tree. Please refer to IOTDB-4364 for the experimental results.