[ https://issues.apache.org/jira/browse/HDFS-3120?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Eli Collins updated HDFS-3120: ------------------------------ Target Version/s: 1.1.0, 2.0.0 (was: 0.23.3, 1.1.0) > Provide ability to enable sync without append > --------------------------------------------- > > Key: HDFS-3120 > URL: https://issues.apache.org/jira/browse/HDFS-3120 > Project: Hadoop HDFS > Issue Type: Improvement > Affects Versions: 1.0.1 > Reporter: Eli Collins > Assignee: Eli Collins > > The work on branch-20-append was to support *sync*, for durable HBase WALs, > not *append*. The branch-20-append implementation is known to be buggy. > There's been confusion about this, we often answer queries on the list [like > this|http://search-hadoop.com/m/wfed01VOIJ5]. Unfortunately, the way to > enable correct sync on branch-1 for HBase is to set dfs.support.append to > true in your config, which has the side effect of enabling append (which we > don't want to do). > Let's add a new *dfs.support.hsync* option that enables working sync (which > is basically the current dfs.support.append flag modulo one place where it's > not referring to sync). For compatibility, if dfs.support.append is set, > dfs.support.sync will be set as well. This way someone can enable sync for > HBase and still keep the current behavior that if dfs.support.append is not > set then an append operation will result in an IOE indicating append is not > supported. We should do this on trunk as well, as there's no reason to > conflate hsync and append with a single config even if append works. -- 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