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https://issues.apache.org/jira/browse/PHOENIX-7113?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rushabh Shah resolved PHOENIX-7113.
-----------------------------------
Resolution: Fixed
> Create a feature flag for invoking MDEI#invalidateServerMetadataCache
> ---------------------------------------------------------------------
>
> Key: PHOENIX-7113
> URL: https://issues.apache.org/jira/browse/PHOENIX-7113
> Project: Phoenix
> Issue Type: Sub-task
> Reporter: Rushabh Shah
> Assignee: Rushabh Shah
> Priority: Major
>
> During schema changes, we invoke
> PhoenixRegionServerEndpoint#invalidateServerMetadataCache on all
> regionservers to invalidate cache for the table which is undergoing schema
> changes.
> To handle incompatibilitues during upgrade, we check if
> PhoenixRegionServerEndpoint coproc is loaded or not. If it is not loaded on
> SYSCAT regionserver, then we don't invalidate the cache but if it is loaded
> on SYSCAT regionserver then we call this coproc method on all regionservers.
> But it is possible that during upgrade if we upgrade the system regionservers
> first then PhoenixRegionServerEndpoint is loaded on SYSCAT RS but not loaded
> on other regionservers. This can cause failures during upgrade.
> To avoid this, lets create a new conf property and once all the reginservers
> are upgraded then set that to true.
> {code}
> String value = conf.get(REGIONSERVER_COPROCESSOR_CONF_KEY);
> if (value == null
> ||
> !value.contains(PhoenixRegionServerEndpoint.class.getName())) {
> // PhoenixRegionServerEndpoint is not loaded. We don't have to
> invalidate the cache.
> LOGGER.info("Skip invalidating server metadata cache since
> PhoenixRegionServerEndpoint"
> + " is not loaded");
> return;
> }
> {code}
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