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https://issues.apache.org/jira/browse/PHOENIX-6655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17647000#comment-17647000
]
ASF GitHub Bot commented on PHOENIX-6655:
-----------------------------------------
gourabtaparia commented on code in PR #1534:
URL: https://github.com/apache/phoenix/pull/1534#discussion_r1048174396
##########
phoenix-core/src/main/java/org/apache/phoenix/query/ConnectionQueryServicesImpl.java:
##########
@@ -3540,11 +3540,18 @@ Collections.<Class<? extends Exception>> singletonList(
if
(!ConnectionQueryServicesImpl.this.upgradeRequired.get()) {
if (!isDoNotUpgradePropSet) {
createOtherSystemTables(metaConnection);
+
+ // When creating the tables above, DDL
statements are
+ // used. However, the CFD level
properties are not set
+ // via DDL commands, hence we are
explicitly setting
+ // few properties using the Admin API
below.
+
updateSystemSequenceWithCacheOnWriteProps(metaConnection);
Review Comment:
@stoty Can you eyeball it ?
> SYSTEM.SEQUENCE should have CACHE_DATA_ON_WRITE set to true
> -----------------------------------------------------------
>
> Key: PHOENIX-6655
> URL: https://issues.apache.org/jira/browse/PHOENIX-6655
> Project: Phoenix
> Issue Type: Improvement
> Reporter: Geoffrey Jacoby
> Assignee: Gourab Taparia
> Priority: Major
> Attachments: Screenshot 2022-11-25 at 4.38.38 PM.png
>
>
> High volume use cases of Phoenix sequences need to write to the same row of
> SYSTEM.SEQUENCE very frequently, but each time we write, the block cache that
> row is in is invalidated and has to be loaded again.
> [~rushabh.shah] was looking at a case in our environment where a sequence was
> being used heavily and found lots of time spent reading the HFiles for the
> same Get of the sequence row within the SequenceRegionObserver increment
> coproc.
> [~apurtell] pointed out offline that HColumnDescriptor has a property,
> CACHE_DATA_ON_WRITE that keeps caches updated when a value is flushed. This
> should help improve contention on sequence increments.
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