[ https://issues.apache.org/jira/browse/HDFS-3702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13720884#comment-13720884 ]
Devaraj Das commented on HDFS-3702: ----------------------------------- A workaround for this in the current codebase is to use the favored node API (HDFS-2576). For example, we could choose some node on the same rack as the first replica in the list of hosts passed to the create API. > Add an option for NOT writing the blocks locally if there is a datanode on > the same box as the client > ----------------------------------------------------------------------------------------------------- > > Key: HDFS-3702 > URL: https://issues.apache.org/jira/browse/HDFS-3702 > Project: Hadoop HDFS > Issue Type: Improvement > Components: hdfs-client > Affects Versions: 1.0.3, 2.0.0-alpha > Reporter: Nicolas Liochon > Priority: Minor > > This is useful for Write-Ahead-Logs: these files are writen for recovery > only, and are not read when there are no failures. > Taking HBase as an example, these files will be read only if the process that > wrote them (the 'HBase regionserver') dies. This will likely come from a > hardware failure, hence the corresponding datanode will be dead as well. So > we're writing 3 replicas, but in reality only 2 of them are really useful. -- 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