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Josh Elser edited comment on ACCUMULO-1637 at 10/16/13 4:25 AM: ---------------------------------------------------------------- bq. The constants in DFSConfigKeys aren't stable between versions. Right, that was the point of making the table in the description (as I figured was likely the case). was (Author: elserj): bq. The constants in DFSConfigKeys aren't stable between versions. Right, that was the point of making the table in the description. > Update HDFS append/sync precondition check for Hadoop 1.2 > --------------------------------------------------------- > > Key: ACCUMULO-1637 > URL: https://issues.apache.org/jira/browse/ACCUMULO-1637 > Project: Accumulo > Issue Type: Bug > Components: tserver > Affects Versions: 1.5.0 > Reporter: Josh Elser > Assignee: Josh Elser > Priority: Critical > Fix For: 1.5.1, 1.6.0 > > > Apache Hadoop 1.2.0 ships with the durable sync enabled by default and the > support append option marked as obsolete. Because of this, the check inside > of TabletServer, meant to ensure that the HDFS WAL can function properly, > incorrectly fails as it doesn't know that dfs.durable.sync is on by default. > This can be worked around by specifying the old durable sync property in > hdfs-site.xml: > {noformat} > <property> > <name>dfs.durable.sync</name> > <value>true</value> > </property> > {noformat} > I'm not sure how to best way to address the differences between the newer and > older versions of Hadoop and their differing append support. > Thanks to Carlos Mundi for pointing this out on user@a.a.o > Using this table to track the presence of these variables and their default > from hdfs/o/a/h/h/DFSConfigKeys and from the codebase when there is no config > parameter for it. > ||Version||DFSConfigKeys.DFS_SUPPORT_APPEND_KEY||DFSConfigKeys.DFS_SUPPORT_APPEND_DEFAULT||"dfs.durable.sync"||Specific > Configuration Required|| > |0.20.205.0|defined|false|not present|yes| > |0.23.x|defined|true|not present|no| > |1.0.x|defined|false|not present|yes| > |1.1.X|not present|absent|implicit "true"|no| > |2.0.x|defined|true|not present|no| > |2.1.x|defined|true|not present|no| > |2.2.0|defined|true|not present|no| -- This message was sent by Atlassian JIRA (v6.1#6144)