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https://issues.apache.org/jira/browse/PHOENIX-2995?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15330919#comment-15330919
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Mujtaba Chohan commented on PHOENIX-2995:
-----------------------------------------
DDL
{code}
CREATE TABLE IF NOT EXISTS TEST.METRICS (id INTEGER NOT NULL, id2 INTEGER NOT
NULL, val INTEGER, display_name varchar, units varchar CONSTRAINT PK PRIMARY
KEY(id,id2)) APPEND_ONLY_SCHEMA = true, UPDATE_CACHE_FREQUENCY = 900000,
AUTO_PARTITION_SEQ=TEST_ID_SEQ
CREATE VIEW IF NOT EXISTS TEST.<26_char_unique_name> (MYCOL INTEGER) AS SELECT
* FROM TEST.METRICS APPEND_ONLY_SCHEMA = true, UPDATE_CACHE_FREQUENCY=900000
{code}
>From jvisualvm, it looks like ~65% of 11K is used by stats. I'll get more
>details on it.
>From talking to Bhinav, millions of view are possible and for acceptable cache
>hit rate, say if we are caching 1/10 of those still that would take beyond
>100-200k cached metadata views range.
> 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: James Taylor
> Labels: Argus
> Attachments: 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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