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https://issues.apache.org/jira/browse/HIVE-25883?focusedWorklogId=716397&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-716397
]
ASF GitHub Bot logged work on HIVE-25883:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 27/Jan/22 12:33
Start Date: 27/Jan/22 12:33
Worklog Time Spent: 10m
Work Description: klcopp commented on a change in pull request #2971:
URL: https://github.com/apache/hive/pull/2971#discussion_r793559890
##########
File path: ql/src/java/org/apache/hadoop/hive/ql/txn/compactor/Cleaner.java
##########
@@ -448,15 +461,15 @@ private boolean isFileBelowWatermark(FileStatus child,
long highWatermark) {
Path p = child.getPath();
String fn = p.getName();
if (!child.isDirectory()) {
- return false;
+ return true;
}
if (fn.startsWith(AcidUtils.BASE_PREFIX)) {
ParsedBaseLight b = ParsedBaseLight.parseBase(p);
- return b.getWriteId() < highWatermark;
+ return b.getWriteId() <= highWatermark;
Review comment:
The AcidDirectory could be based off of some older txn id (depending on
how the Cleaner selects which compaction to pick up – if CQ_NEXT_TXN_ID is
filled in the cleaner will only attempt to clean when it can, however if
CQ_NEXT_TXN_ID==NULL then the cleaner will try to clean even if it's blocked by
an obsolete dir). It could be that txnId=99 was opened, table a was created,
table a is compacted many times but the cleaner will never clean anything from
table a until txnid=99 is closed, because txnid=99 sees table a as totally
empty.
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Issue Time Tracking
-------------------
Worklog Id: (was: 716397)
Time Spent: 2.5h (was: 2h 20m)
> Enhance Compaction Cleaner to skip when there is nothing to do
> --------------------------------------------------------------
>
> Key: HIVE-25883
> URL: https://issues.apache.org/jira/browse/HIVE-25883
> Project: Hive
> Issue Type: Bug
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
> Time Spent: 2.5h
> Remaining Estimate: 0h
>
> the cleaner works the following way:
> * it identifies obsolete directories (delta dirs ; which doesn't have open
> txns)
> * removes them and done
> if there are no obsolete directoris that is attributed to that there might be
> open txns so the request should be retried later.
> however if for some reason the directory was already cleaned - similarily it
> has no obsolete directories; and thus the request is retried for forever
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