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From "Moore, Matthew J." <>
Subject RE: Running Accumulo straight from Memory
Date Wed, 12 Sep 2012 16:32:31 GMT

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.





On Behalf Of Adam Fuchs
Sent: Tuesday, September 11, 2012 5:30 PM
Subject: Re: Running Accumulo straight from Memory




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
<>  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?





On Tue, Sep 11, 2012 at 12:02 PM, Moore, Matthew J.
<> 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


Columbia, MD




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