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Release note for partition filters

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Summary:
I tagged it experimental since the configuring the filter partitions by size will not be ready for this release.
Closes https://github.com/facebook/rocksdb/pull/2049

Differential Revision: D4831575

Pulled By: maysamyabandeh

fbshipit-source-id: fcc2d25
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Maysam Yabandeh 8 years ago committed by Facebook Github Bot
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commit e2a7b202c3
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      HISTORY.md

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HISTORY.md
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@ -10,6 +10,7 @@
### New Features ### New Features
* Memtable flush can be avoided during checkpoint creation if total log file size is smaller than a threshold specified by the user. * Memtable flush can be avoided during checkpoint creation if total log file size is smaller than a threshold specified by the user.
* Introduce level-based L0->L0 compactions to reduce file count, so write delays are incurred less often. * Introduce level-based L0->L0 compactions to reduce file count, so write delays are incurred less often.
* (Experimental) Partitioning filters which creates an index on the partitions. The feature can be enabled by setting partition_filters when using kFullFilter. Currently the feature also requires two-level indexing to be enabled. Number of partitions is the same as the number of partitions for indexes, which is controlled by metadata_block_size.
## 5.3.0 (03/08/2017) ## 5.3.0 (03/08/2017)
### Public API Change ### Public API Change

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