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From karanmehta93 <>
Subject [GitHub] phoenix pull request #277: PHOENIX-3757 System mutex table not being created...
Date Tue, 24 Oct 2017 21:17:28 GMT
Github user karanmehta93 commented on a diff in the pull request:
    --- Diff: phoenix-core/src/main/java/org/apache/phoenix/coprocessor/
    @@ -95,6 +97,7 @@
         // Key is the SYSTEM.CATALOG timestamp for the version and value is the version string.
         private static final NavigableMap<Long, String> TIMESTAMP_VERSION_MAP = new
         static {
    --- End diff --
    Nope, this one is not only for test. 
    When you acquire a lock on SYSMUTEX, the method requires you to pass in a server side
timestamp of SYSCAT table (Since it was meant for that earlier) and it checks if the current
timestamp is less than the MIN_SYSTEM_TABLE_TIMESTAMP before upgrading it.
    I can't use MIN_SYSTEM_TABLE_TIMESTAMP because then the code for `acquireUpgradeMutex()`
wont allow me to acquire the mutex lock.
    I use the same `UpgradeInProgressException` to prevent multiple clients migrating the
system tables together. I use this value in `UpgradeInProgressException` to change the error
message displayed to the user. 


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