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Suresh Srinivas commented on HDFS-3731: --------------------------------------- Colin, is the recovery mechanism for bbw blocks in 1.x and rbw in 2.x compatible? > 2.0 release upgrade must handle blocks being written from 1.0 > ------------------------------------------------------------- > > Key: HDFS-3731 > URL: https://issues.apache.org/jira/browse/HDFS-3731 > Project: Hadoop HDFS > Issue Type: Bug > Components: data-node > Affects Versions: 2.0.0-alpha > Reporter: Suresh Srinivas > Assignee: Colin Patrick McCabe > Priority: Blocker > Attachments: HDFS-3731.002.patch, HDFS-3731.003.patch > > > Release 2.0 upgrades must handle blocks being written to (bbw) files from 1.0 > release. Problem reported by Brahma Reddy. > The {{DataNode}} will only have one block pool after upgrading from a 1.x > release. (This is because in the 1.x releases, there were no block pools-- > or equivalently, everything was in the same block pool). During the upgrade, > we should hardlink the block files from the {{blocksBeingWritten}} directory > into the {{rbw}} directory of this block pool. Similarly, on {{-finalize}}, > we should delete the {{blocksBeingWritten}} directory. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira