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https://issues.apache.org/jira/browse/HIVE-21197?focusedWorklogId=203235&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-203235
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ASF GitHub Bot logged work on HIVE-21197:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 24/Feb/19 14:02
Start Date: 24/Feb/19 14:02
Worklog Time Spent: 10m
Work Description: maheshk114 commented on pull request #541: HIVE-21197 :
Hive Replication can add duplicate data during migration to a target with
hive.strict.managed.tables enabled
URL: https://github.com/apache/hive/pull/541#discussion_r259622190
##########
File path: ql/src/java/org/apache/hadoop/hive/ql/exec/ReplCopyTask.java
##########
@@ -271,12 +299,13 @@ public String getName() {
LOG.debug("ReplCopyTask:getLoadCopyTask: {}=>{}", srcPath, dstPath);
if ((replicationSpec != null) && replicationSpec.isInReplicationScope()){
ReplCopyWork rcwork = new ReplCopyWork(srcPath, dstPath, false);
- if (replicationSpec.isReplace() &&
conf.getBoolVar(REPL_ENABLE_MOVE_OPTIMIZATION)) {
+ if (replicationSpec.isReplace() &&
(conf.getBoolVar(REPL_ENABLE_MOVE_OPTIMIZATION) || copyToMigratedTxnTable)) {
rcwork.setDeleteDestIfExist(true);
Review comment:
done
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Issue Time Tracking
-------------------
Worklog Id: (was: 203235)
Time Spent: 9.5h (was: 9h 20m)
> Hive replication can add duplicate data during migration to a target with
> hive.strict.managed.tables enabled
> ------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-21197
> URL: https://issues.apache.org/jira/browse/HIVE-21197
> Project: Hive
> Issue Type: Task
> Components: repl
> Reporter: mahesh kumar behera
> Assignee: mahesh kumar behera
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-21197.01.patch, HIVE-21197.02.patch
>
> Time Spent: 9.5h
> Remaining Estimate: 0h
>
> During bootstrap phase it may happen that the files copied to target are
> created by events which are not part of the bootstrap. This is because of the
> fact that, bootstrap first gets the last event id and then the file list.
> During this period if some event are added, then bootstrap will include files
> created by these events also.The same files will be copied again during the
> first incremental replication just after the bootstrap. In normal scenario,
> the duplicate copy does not cause any issue as hive allows the use of target
> database only after the first incremental. But in case of migration, the file
> at source and target are copied to different location (based on the write id
> at target) and thus this may lead to duplicate data at target. This can be
> avoided by having at check at load time for duplicate file. This check can be
> done only for the first incremental and the search can be done in the
> bootstrap directory (with write id 1). if the file is already present then
> just ignore the copy.
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