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Hive Metastore Cache talk from May 2018 Hive User Group Meeting @Cloudera - https://www.meetup.com/Hive-User-Group-Meeting/events/249641278/
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Hive Metastore Cache
- 1. 1 © Hortonworks Inc. 2011 – 2017. All Rights Reserved Hive Metastore Cache
- 2. 2 © Hortonworks Inc. 2011 – 2017. All Rights Reserved Motivation ⬢ Metastore becomes a bottleneck ⬢ Throttle happens in Azure DB ⬢ Interactive queries ⬢ Lots of repeated calls – 108 getTable calls in on query
- 3. 3 © Hortonworks Inc. 2011 – 2017. All Rights Reserved How CachedStore Work Remote Metastore HS2 Embedded Metastore CachedStore CachedStore ⬢ Serverside cache ⬢ Cache all metadata in memory ⬢ Database ⬢ Table ⬢ StorageDescriptor ⬢ Partition ⬢ Statistics ⬢ Time based refresh ⬢ 10m partitions in 6G memory ⬢ set hive.metastore.rawstore.impl=CachedStore
- 4. 4 © Hortonworks Inc. 2011 – 2017. All Rights Reserved Deal Memory Limit ⬢ Reality – Extreme use case – NDV Bitvector: 16k per column per partition • 2000 partition * 200 columns * 16k=6.4G ⬢ Solution – Use fewer bits for NDV • 2000 partition * 200 columns * 1k=400M – Black list/White list – Stop loading when memory full
- 5. 5 © Hortonworks Inc. 2011 – 2017. All Rights Reserved Deal with HA ⬢ Strong consistency requirement – Metastore writes should propagate to all caches before use – Metastore writes needs propagate to all CachedStore before ACK CachedStore Write MySQL CachedStore Notify