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Jing Zhao commented on HDFS-4213: --------------------------------- Thanks for the comments Todd. To allow hflush() to update the NN's metadata is also in the plan but I plan to do that in an separate jira so as to make the backport easier (considering branch-1 only has hflush semantic). The enum improvement looks very good. I will update the patch to address the comment. > When the client calls hsync(), allows the client to update the file length in > the NameNode > ------------------------------------------------------------------------------------------ > > Key: HDFS-4213 > URL: https://issues.apache.org/jira/browse/HDFS-4213 > Project: Hadoop HDFS > Issue Type: New Feature > Affects Versions: 3.0.0 > Reporter: Jing Zhao > Assignee: Jing Zhao > Attachments: HDFS-4213.001.patch, HDFS-4213.002.patch, > HDFS-4213.003.patch > > > As per discussion in HDFS-3960 and HDFS-2802, when clients that need strong > consistency update the file length at the NameNode, a special sync is > required for getting the length of the being written files when snapshots are > taken for these files. This jira implements this sync-with-updating-length by > 1) calling ClientProtocol#fsync(), and 2) adding a new field to > ClientProtocol#fsync() to indicate the length information. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira