[ https://issues.apache.org/jira/browse/HADOOP-15297?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steve Loughran updated HADOOP-15297: ------------------------------------ Attachment: HADOOP-15297-002.patch > Make S3A etag => checksum feature optional > ------------------------------------------ > > Key: HADOOP-15297 > URL: https://issues.apache.org/jira/browse/HADOOP-15297 > Project: Hadoop Common > Issue Type: Sub-task > Components: fs/s3 > Affects Versions: 3.1.0 > Reporter: Steve Loughran > Assignee: Steve Loughran > Priority: Blocker > Attachments: HADOOP-15297-001.patchh, HADOOP-15297-002.patch, > HADOOP-15297-002.patch > > > HADOOP-15273 shows how distcp doesn't handle non-HDFS filesystems with > checksums. > Exposing Etags as checksums, HADOOP-13282, breaks workflows which back up to > s3a. > Rather than revert I want to make it an option, off by default. Once we are > happy with distcp in future, we can turn it on. > Why an option? Because it lines up for a successor to distcp which saves src > and dest checksums to a file and can then verify whether or not files have > really changed. Currently distcp relies on dest checksum algorithm being the > same as the src for incremental updates, but if either of the stores don't > serve checksums, silently downgrades to not checking. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org