[
https://issues.apache.org/jira/browse/HIVE-23671?focusedWorklogId=455344&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-455344
]
ASF GitHub Bot logged work on HIVE-23671:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 07/Jul/20 10:53
Start Date: 07/Jul/20 10:53
Worklog Time Spent: 10m
Work Description: pvargacl commented on a change in pull request #1087:
URL: https://github.com/apache/hive/pull/1087#discussion_r450777758
##########
File path:
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/txn/TxnDbUtil.java
##########
@@ -313,6 +313,41 @@ private static void resetTxnSequence(Connection conn,
Statement stmt) throws SQL
}
}
+ /**
+ * Restarts the txnId sequence with the given seed value.
+ * It is the responsibility of the caller to not set the sequence backward.
+ * @param conn database connection
+ * @param stmt sql statement
+ * @param seedTxnId the seed value for the sequence
+ * @throws SQLException ex
+ */
+ public static void seedTxnSequence(Connection conn, Statement stmt, long
seedTxnId) throws SQLException {
+ String dbProduct = conn.getMetaData().getDatabaseProductName();
+ DatabaseProduct databaseProduct = determineDatabaseProduct(dbProduct);
+ switch (databaseProduct) {
+
+ case DERBY:
Review comment:
fixed
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Issue Time Tracking
-------------------
Worklog Id: (was: 455344)
Time Spent: 10.5h (was: 10h 20m)
> 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: 10.5h
> 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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