Matt,
Did you see Eric Newton's response yesterday? Running on a ram disk has been done; however minor and major compactions will still occur. - Dave ----- Original Message ----- From: "Matthew J. Moore" <[email protected]> To: [email protected] Sent: Wednesday, September 12, 2012 12:32:31 PM Subject: RE: Running Accumulo straight from Memory Adam, It does look like we are the first to try this. We are trying to keep everything in memory and as a result there is no minor compactions, and probably major compactions to make tables larger. We tried this on SSDs using a file system and we were not getting the processing speeds that we had wanted. Matt From: [email protected] [mailto:[email protected]] On Behalf Of Adam Fuchs Sent: Tuesday, September 11, 2012 5:30 PM To: [email protected] Subject: Re: Running Accumulo straight from Memory Matthew, I don't know of anyone who has done this, but I believe you could: 1. mount a RAM disk 2. point the hdfs core-site.xml fs.default.name property to file:/// 3. point the accumulo-site.xml instance.dfs.dir property to a directory on the RAM disk 4. disable the WAL for all tables by setting the accumulo-site.xml table.walog.enabled to false 5. initialize and start up accumulo as you regularly would and cross your fingers Of course, the "you may lose data" and "this is not an officially supported configuration" caveats apply. Out of curiosity, what would you be trying to accomplish with this configuration? Adam On Tue, Sep 11, 2012 at 12:02 PM, Moore, Matthew J. < [email protected] > wrote: Has anyone run Accumulo on a single server straight from memory? Probably using something like a Fusion IO drive. We are trying to use it without using an SSD or any spinning discs. Matthew Moore Systems Engineer SAIC, ISBU Columbia, MD 410-312-2542
