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https://issues.apache.org/jira/browse/PHOENIX-3757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16219444#comment-16219444
]
ASF GitHub Bot commented on PHOENIX-3757:
-----------------------------------------
Github user karanmehta93 commented on a diff in the pull request:
https://github.com/apache/phoenix/pull/277#discussion_r146972984
--- Diff:
phoenix-core/src/main/java/org/apache/phoenix/query/ConnectionQueryServicesImpl.java
---
@@ -3101,49 +3124,72 @@ void ensureSystemTablesUpgraded(ReadOnlyProps props)
// Regardless of the case 1 or 2, if the NS does not
exist, we will error expectedly
// below. If the NS does exist and is mapped, the below
check will exit gracefully.
}
-
+
List<TableName> tableNames = getSystemTableNames(admin);
// No tables exist matching "SYSTEM\..*", they are all already
in "SYSTEM:.*"
if (tableNames.size() == 0) { return; }
// Try to move any remaining tables matching "SYSTEM\..*" into
"SYSTEM:"
if (tableNames.size() > 5) {
logger.warn("Expected 5 system tables but found " +
tableNames.size() + ":" + tableNames);
}
+
+ // Try acquiring a lock in SYSMUTEX table before migrating the
tables since it involves disabling the table
+ // If we cannot acquire lock, it means some old client is
either migrating SYSCAT or trying to upgrade the
+ // schema of SYSCAT table and hence it should not be
interrupted
+ acquiredMutexLock = acquireUpgradeMutex(0, mutexRowKey);
--- End diff --
Added it in a new commit.
> System mutex table not being created in SYSTEM namespace when namespace
> mapping is enabled
> ------------------------------------------------------------------------------------------
>
> Key: PHOENIX-3757
> URL: https://issues.apache.org/jira/browse/PHOENIX-3757
> Project: Phoenix
> Issue Type: Bug
> Reporter: Josh Elser
> Assignee: Karan Mehta
> Priority: Critical
> Labels: namespaces
> Fix For: 4.13.0
>
> Attachments: PHOENIX-3757.001.patch, PHOENIX-3757.002.patch,
> PHOENIX-3757.003.patch
>
>
> Noticed this issue while writing a test for PHOENIX-3756:
> The SYSTEM.MUTEX table is always created in the default namespace, even when
> {{phoenix.schema.isNamespaceMappingEnabled=true}}. At a glance, it looks like
> the logic for the other system tables isn't applied to the mutex table.
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