[ https://issues.apache.org/jira/browse/HDFS-7788?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kihwal Lee updated HDFS-7788: ----------------------------- Summary: Post-2.6 namenode may not start up with an image containing inodes created with an old release. (was: Post 2.6 namenode may not start up with an image containing inodes created with an old release.) > Post-2.6 namenode may not start up with an image containing inodes created > with an old release. > ----------------------------------------------------------------------------------------------- > > Key: HDFS-7788 > URL: https://issues.apache.org/jira/browse/HDFS-7788 > Project: Hadoop HDFS > Issue Type: Bug > Reporter: Kihwal Lee > Priority: Blocker > > Before HDFS-4305, which was fixed in 2.1.0-beta, clients could specify > arbitrarily small preferred block size for a file including 0. This was > normally done by faulty clients or failed creates, but it was possible. > Until 2.5, reading a fsimage containing inodes with 0 byte preferred block > size was allowed. So if a fsimage contained such an inode, the namenode would > come up fine. In 2.6, the preferred block size is required be > 0. Because > of this change, the image that worked with 2.5 may not work with 2.6. > If a cluster ran a version of hadoop earlier than 2.1.0-beta before, it is > under this risk even if it worked fine with 2.5. -- This message was sent by Atlassian JIRA (v6.3.4#6332)