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https://issues.apache.org/jira/browse/HIVE-24291?focusedWorklogId=506619&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-506619
]
ASF GitHub Bot logged work on HIVE-24291:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 30/Oct/20 09:49
Start Date: 30/Oct/20 09:49
Worklog Time Spent: 10m
Work Description: deniskuzZ commented on a change in pull request #1592:
URL: https://github.com/apache/hive/pull/1592#discussion_r514979640
##########
File path:
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/txn/TxnHandler.java
##########
@@ -1526,6 +1529,10 @@ private void
updateWSCommitIdAndCleanUpMetadata(Statement stmt, long txnid, TxnT
if (txnType == TxnType.MATER_VIEW_REBUILD) {
queryBatch.add("DELETE FROM \"MATERIALIZATION_REBUILD_LOCKS\" WHERE
\"MRL_TXN_ID\" = " + txnid);
}
+ if (txnType == TxnType.COMPACTION) {
Review comment:
I think, you could make `updateWSCommitIdAndCleanUpMetadata` protected
and overwrite it in CompactionTxnHandler, so we won't scatter compaction
related stuff across many classes.
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Issue Time Tracking
-------------------
Worklog Id: (was: 506619)
Time Spent: 1h 10m (was: 1h)
> Compaction Cleaner prematurely cleans up deltas
> -----------------------------------------------
>
> Key: HIVE-24291
> URL: https://issues.apache.org/jira/browse/HIVE-24291
> Project: Hive
> Issue Type: Bug
> Reporter: Peter Varga
> Assignee: Peter Varga
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> Since HIVE-23107 the cleaner can clean up deltas that are still used by
> running queries.
> Example:
> * TxnId 1-5 writes to a partition, all commits
> * Compactor starts with txnId=6
> * Long running query starts with txnId=7, it sees txnId=6 as open in its
> snapshot
> * Compaction commits
> * Cleaner runs
> Previously min_history_level table would have prevented the Cleaner to delete
> the deltas1-5 until txnId=7 is open, but now they will be deleted and the
> long running query may fail if its tries to access the files.
> Solution could be to not run the cleaner until any txn is open that was
> opened before the compaction was committed (CQ_NEXT_TXN_ID)
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