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https://issues.apache.org/jira/browse/HBASE-27542?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bryan Beaudreault resolved HBASE-27542.
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Fix Version/s: 3.0.0-alpha-4
Resolution: Fixed
> Remove unneeded distcp log cleanup after incremental backups
> ------------------------------------------------------------
>
> Key: HBASE-27542
> URL: https://issues.apache.org/jira/browse/HBASE-27542
> Project: HBase
> Issue Type: Improvement
> Components: backup&restore
> Affects Versions: 3.0.0-alpha-3
> Reporter: Jarryd Lee
> Priority: Minor
> Fix For: 3.0.0-alpha-4
>
>
> During the completion step of incremental backups, the
> [TableBackupClient|https://github.com/apache/hbase/blob/2c3abae18aa35e2693b64b143316817d4569d0c3/hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/impl/TableBackupClient.java#L343-L355]
> ensures distcp logs are cleaned up. However,
> [DistCp|https://github.com/apache/hadoop/blob/b87c0ea7ebde3edc312dcc8938809610a914df7f/hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/DistCp.java#L465-L476]
> already ensures that the metafolder, where the distcp logs are stored, is
> cleaned up via the
> [CopyCommitter|https://github.com/apache/hadoop/blob/b743d56eb4bf350448bd315540fde4f029175082/hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/mapred/CopyCommitter.java#L189].
> Additionally, when running in an external yarn cluster external to hbase,
> this causes issues as it assumes a common filesystem.
> The TableBackupClient cleanup method should be able to be safely removed.
> e: After digging in to this even more, the `_distcp_log` path used in the
> `TableBackupClient` is not actually the correct path used by distcp.
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