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https://issues.apache.org/jira/browse/HIVE-19927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16559308#comment-16559308
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anishek commented on HIVE-19927:
--------------------------------
+1
> Last Repl ID set by bootstrap dump is incorrect and may cause data loss if
> have ACID/MM tables.
> -----------------------------------------------------------------------------------------------
>
> Key: HIVE-19927
> URL: https://issues.apache.org/jira/browse/HIVE-19927
> Project: Hive
> Issue Type: Sub-task
> Components: HiveServer2, Transactions
> Affects Versions: 3.1.0
> Reporter: Sankar Hariappan
> Assignee: Sankar Hariappan
> Priority: Major
> Labels: DR, pull-request-available, replication
> Attachments: HIVE-19927.01.patch, HIVE-19927.02.patch,
> HIVE-19927.03.patch, HIVE-19927.04.patch
>
>
> During bootstrap dump of ACID tables, let's consider the below sequence.
> - Current session (REPL DUMP), Open txn (Txn1) - Event-10
> - Another session (Session-2), Open txn (Txn2) - Event-11
> - Session-2 -> Insert data (T1.D1) to ACID table. - Event-12
> - Get lastReplId = last event ID logged. (Event-12)
> - Session-2 -> Commit Txn (Txn2) - Event-13
> - Dump ACID tables based on validTxnList based on Txn1. --> This step skips
> all the data written by txns > Txn1. So, T1.D1 will be missing.
> - Commit Txn (Txn1)
> - REPL LOAD from bootstrap dump will skip T1.D1.
> - Incremental REPL DUMP will start from Event-13 and hence lose Txn2 which is
> opened after Txn1. So, data T1.D1 will be lost for ever.
> Proposed to capture the lastReplId of bootstrap before opening current txn
> (Txn1) and store it in Driver context and use it for dump.
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