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https://issues.apache.org/jira/browse/PHOENIX-2995?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15422135#comment-15422135
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James Taylor commented on PHOENIX-2995:
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Actually, I think there may be some missing read locks on the get methods for
PMetaData calls in ConnectionQueryServices. All calls to size, getTableRef,
getFunction, getAge, and getSchema must be done under a read lock. If this is
too messy, you might create a PSynchronizedMetaData that takes the lock and
delegates to another PMetaData instance. We'd still need the existing
synchronization on latestMetaDataLock as it serves a different purpose (to
ensure we process the server calls in order of the sequence number).
> Write performance severely degrades with large number of views
> ---------------------------------------------------------------
>
> Key: PHOENIX-2995
> URL: https://issues.apache.org/jira/browse/PHOENIX-2995
> Project: Phoenix
> Issue Type: Bug
> Reporter: Mujtaba Chohan
> Assignee: Thomas D'Silva
> Labels: Argus
> Fix For: 4.8.1
>
> Attachments: PHOENIX-2995-v2.patch, PHOENIX-2995-v3.patch,
> PHOENIX-2995-v4.patch, PHOENIX-2995-v5.patch, PHOENIX-2995.patch,
> create_view_and_upsert.png, image.png, image2.png, image3.png, upsert_rate.png
>
>
> Write performance for each 1K batch degrades significantly when there are
> *10K* views being written in random with default
> {{phoenix.client.maxMetaDataCacheSize}}. With all views created, upsert rate
> remains around 25 seconds per 1K batch i.e. ~2K rows/min upsert rate.
> When {{phoenix.client.maxMetaDataCacheSize}} is increased to 100MB+ then view
> does not need to get re-resolved and upsert rate gets back to normal ~60K
> rows/min.
> With *100K* views and {{phoenix.client.maxMetaDataCacheSize}} set to 1GB, I
> wasn't able create all 100K views as upsert time for each 1K batch keeps on
> steadily increasing.
> Following graph shows 1K batch upsert rate over time with variation of number
> of views. Rows are upserted to random views {{CREATE VIEW IF NOT EXISTS ...
> APPEND_ONLY_SCHEMA = true, UPDATE_CACHE_FREQUENCY=900000}} is executed before
> upsert statement.
> !upsert_rate.png!
> Base table is also created with {{APPEND_ONLY_SCHEMA = true,
> UPDATE_CACHE_FREQUENCY = 900000, AUTO_PARTITION_SEQ}}
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