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From "Keith Turner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-868) Explore configuring vfs cache
Date Fri, 14 Dec 2012 17:42:14 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13532487#comment-13532487
] 

Keith Turner commented on ACCUMULO-868:
---------------------------------------

bq. What do we do for the logs directory? Can we put the cache dir inside the logs dir?

The default for walogs and logs is $ACCUMULO_HOME.  User are encouraged to change both.  Another
problem I have seen with ACCUMULO_HOME is its on NFS sometimes, which is not good for logs
or cache.   System tmp dir will be local and writable.   I share your concern about tmp filling
up, I have seen this happen and when tmp dir is in OS partition it can be a disaster.  So
I think tmp has the best chance of working out of the box for a new user, but could cause
problems in the long term on production systems.

We could put the property in the example config (like walog config), encouraging user to set
it to something appropriate for their system. Default it system tmp so it works out of the
box for new users, but make system admins cognizant of this config for production systems.
 Comment in the example config should point out that this propery only matters if using vfs
classloader.




                
> Explore configuring vfs cache
> -----------------------------
>
>                 Key: ACCUMULO-868
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-868
>             Project: Accumulo
>          Issue Type: Sub-task
>          Components: start
>            Reporter: Keith Turner
>            Assignee: Dave Marion
>             Fix For: 1.5.0
>
>         Attachments: ACCUMULO-868-1.patch
>
>
> The current caching of jars is in /tmp and seems to be per process.   Can this be made
to survive process restarts?  Similar to rsync.

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