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https://issues.apache.org/jira/browse/HIVE-23671?focusedWorklogId=454905&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-454905
 ]

ASF GitHub Bot logged work on HIVE-23671:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 06/Jul/20 15:27
            Start Date: 06/Jul/20 15:27
    Worklog Time Spent: 10m 
      Work Description: pvargacl commented on a change in pull request #1087:
URL: https://github.com/apache/hive/pull/1087#discussion_r450301348



##########
File path: ql/src/java/org/apache/hadoop/hive/ql/io/AcidUtils.java
##########
@@ -2392,33 +2392,29 @@ public static TableSnapshot 
getTableSnapshot(Configuration conf,
     long writeId = -1;
     ValidWriteIdList validWriteIdList = null;
 
-    HiveTxnManager sessionTxnMgr = SessionState.get().getTxnMgr();
-    String fullTableName = getFullTableName(dbName, tblName);
-    if (sessionTxnMgr != null && sessionTxnMgr.getCurrentTxnId() > 0) {
-      validWriteIdList = getTableValidWriteIdList(conf, fullTableName);
-      if (isStatsUpdater) {
-        writeId = SessionState.get().getTxnMgr() != null ?
-                SessionState.get().getTxnMgr().getAllocatedTableWriteId(
-                  dbName, tblName) : -1;
-        if (writeId < 1) {
-          // TODO: this is not ideal... stats updater that doesn't have write 
ID is currently
-          //       "create table"; writeId would be 0/-1 here. No need to call 
this w/true.
-          LOG.debug("Stats updater for {}.{} doesn't have a write ID ({})",
-              dbName, tblName, writeId);
+    if (SessionState.get() != null) {

Review comment:
       It can be null, if the sessionstate was not set properly, it was failing 
one of the tests, i can't remember which.




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Issue Time Tracking
-------------------

    Worklog Id:     (was: 454905)
    Time Spent: 7h  (was: 6h 50m)

> MSCK repair should handle transactional tables in certain usecases
> ------------------------------------------------------------------
>
>                 Key: HIVE-23671
>                 URL: https://issues.apache.org/jira/browse/HIVE-23671
>             Project: Hive
>          Issue Type: Improvement
>          Components: Metastore
>            Reporter: Peter Varga
>            Assignee: Peter Varga
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 7h
>  Remaining Estimate: 0h
>
> The MSCK REPAIR tool does not handle transactional tables too well. It can 
> find and add new partitions the same way as for non-transactional tables, but 
> since the writeId differences are not handled, the data can not read back 
> from the new partitions.
> We could handle some usecases when the writeIds in the HMS and the underlying 
> data are not conflicting. If the HMS does not contains allocated writes for 
> the table we can seed the table with the writeIds read from the directory 
> structrure.
> Real life use cases could be:
>  * Copy data files from one cluster to another with different HMS, create the 
> table and call MSCK REPAIR
>  * If the HMS db is lost, recreate the table and call MSCK REPAIR
>  



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