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https://issues.apache.org/jira/browse/HIVE-22255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16941536#comment-16941536
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Naresh P R commented on HIVE-22255:
-----------------------------------
[~pvary] As its insert overwrite, i assume we have exclusive lock on the table.
Cleaner thread generally gets triggered for every 5s, if compaction flow is
creating new base, then old base might have been cleared by cleaner thread,
however i doubt insert overwrite is leaving stale base folder which are not
getting cleared.
> Hive don't trigger Major Compaction automatically if table contains only base
> files
> ------------------------------------------------------------------------------------
>
> Key: HIVE-22255
> URL: https://issues.apache.org/jira/browse/HIVE-22255
> Project: Hive
> Issue Type: Bug
> Components: Hive, Transactions
> Affects Versions: 3.1.2
> Environment: Hive-3.1.1
> Reporter: Rajkumar Singh
> Assignee: Rajkumar Singh
> Priority: Major
>
> user may run into the issue if the table consists of all base files but no
> delta, then the following condition will yield false and automatic major
> compaction will be skipped.
> [https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/txn/compactor/Initiator.java#L313]
>
> Steps to Reproduce:
> # create Acid table
> {code:java}
> // create table myacid(id int);
> {code}
> # Run multiple insert table
> {code:java}
> // insert overwrite table myacid values(1);insert overwrite table myacid
> values(2),(3),(4){code}
> # DFS ls output
> {code:java}
> // dfs -ls -R /warehouse/tablespace/managed/hive/myacid;
> +----------------------------------------------------+
> | DFS Output |
> +----------------------------------------------------+
> | drwxrwx---+ - hive hadoop 0 2019-09-27 16:42
> /warehouse/tablespace/managed/hive/myacid/base_0000001 |
> | -rw-rw----+ 3 hive hadoop 1 2019-09-27 16:42
> /warehouse/tablespace/managed/hive/myacid/base_0000001/_orc_acid_version |
> | -rw-rw----+ 3 hive hadoop 610 2019-09-27 16:42
> /warehouse/tablespace/managed/hive/myacid/base_0000001/bucket_00000 |
> | drwxrwx---+ - hive hadoop 0 2019-09-27 16:43
> /warehouse/tablespace/managed/hive/myacid/base_0000002 |
> | -rw-rw----+ 3 hive hadoop 1 2019-09-27 16:43
> /warehouse/tablespace/managed/hive/myacid/base_0000002/_orc_acid_version |
> | -rw-rw----+ 3 hive hadoop 633 2019-09-27 16:43
> /warehouse/tablespace/managed/hive/myacid/base_0000002/bucket_00000 |
> +----------------------------------------------------+{code}
>
> you will see that Major compaction will not be trigger until you run alter
> table compact MAJOR.
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