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Virajith Jalaparti edited comment on HDFS-12996 at 1/10/18 1:41 AM: -------------------------------------------------------------------- Thanks for posting the design document [~hanishakoneru]. A few questions - # In Section 13, Step 5, which component receives the _restore-replica-trash_ command? From my understanding this should be the Namenode. However, in step 5 the Namenode is not running. How is this going to work? # Have you looked at "undoing" the delete operation? I think this would need to handle conflicts (for example, /foo/bar was deleted but a new /foo/bar/ is created) but could avoid having to stop and restart the Namenode. # Can the replica purge daemon functionality be implemented in the VolumeScanner? was (Author: virajith): Thanks for posting the design document [~hanishakoneru]. A few questions - # In Section 13, Step 5, which component receives the _restore-replica-trash_ command? From my understanding this should be the Namenode. However, in step 5 the Namenode is not running. How is this going to work? # Have you looked at "undoing" the delete operation? I think this would need to handle conflicts (for example, /foo/bar was deleted but a new /foo/bar/ is created) but could avoid having to stop and restart the Namenode. > DataNode Replica Trash > ---------------------- > > Key: HDFS-12996 > URL: https://issues.apache.org/jira/browse/HDFS-12996 > Project: Hadoop HDFS > Issue Type: New Feature > Reporter: Hanisha Koneru > Assignee: Hanisha Koneru > Attachments: DataNode_Replica_Trash_Design_Doc.pdf > > > DataNode Replica Trash will allow administrators to recover from a recent > delete request that resulted in catastrophic loss of user data. This is > achieved by placing all invalidated blocks in a replica trash on the datanode > before completely purging them from the system. The design doc is attached > here. -- This message was sent by Atlassian JIRA (v6.4.14#64029) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org