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https://issues.apache.org/jira/browse/PHOENIX-7025?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17771226#comment-17771226
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ASF GitHub Bot commented on PHOENIX-7025:
-----------------------------------------
palashc commented on code in PR #1666:
URL: https://github.com/apache/phoenix/pull/1666#discussion_r1342971828
##########
phoenix-core/src/main/java/org/apache/phoenix/schema/MetaDataClient.java:
##########
@@ -903,7 +903,7 @@ private boolean
addColumnsAndIndexesFromAncestors(MetaDataMutationResult result,
String parentSchemaName =
SchemaUtil.getSchemaNameFromFullName(parentName);
tableName = SchemaUtil.getTableNameFromFullName(parentName);
MetaDataMutationResult parentResult =
updateCache(connection.getTenantId(), parentSchemaName, tableName,
- false, resolvedTimestamp);
+ true, resolvedTimestamp);
Review Comment:
@shahrs87 `MetaDataClient.updateCache` eventually calls this method
`addColumnsAndIndexesFromAncestors` which looks up ancestors of views and view
indexes and recursively calls `MetaDataClient.updateCache` on every parent
table up the hierarchy. Currently, the value of `alwaysHitServer` is false for
all these recursive calls i.e. we will look up the ancestors in the local cache
if UPDATE_CACHE_FREQUENCY is set to NEVER. Setting it to true bypasses all
checks for avoiding the rpc to get table
([code](https://github.com/apache/phoenix/blob/master/phoenix-core/src/main/java/org/apache/phoenix/schema/MetaDataClient.java#L749))
and updates the entire hierarchy.
> Create a new RPC to validate last ddl timestamp for read requests.
> ------------------------------------------------------------------
>
> Key: PHOENIX-7025
> URL: https://issues.apache.org/jira/browse/PHOENIX-7025
> Project: Phoenix
> Issue Type: Sub-task
> Reporter: Rushabh Shah
> Assignee: Palash Chauhan
> Priority: Major
>
> Introduce a new RPC request from phoenix client to any region server via
> PhoenixRegionServerEndpoint#validateLastDDLTimestamp. Since the last ddl
> timestamp cache is maintained by all the regionservers, you can choose any
> regionserver randomly. In future, we can make this rpc more resilient by
> sending this rpc to multiple regionservers simultaneously.
> If phoenix client throws StaleMetadataCacheException then invalidate the
> cache on the client side and retry executeQuery method while fetching the
> updated metadata from SYSCAT regionserver.
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