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From Apache Wiki <wikidi...@apache.org>
Subject [Solr Wiki] Trivial Update of "LotsOfCores" by ErickErickson
Date Tue, 22 Jan 2013 16:02:07 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Solr Wiki" for change notification.

The "LotsOfCores" page has been changed by ErickErickson:
http://wiki.apache.org/solr/LotsOfCores?action=diff&rev1=20&rev2=21

Comment:
Claiming that "automatic allotment of dataDir for cores" is unnecessary

   1. Lazy load cores - Provide a way to START/STOP core.
   1. Automatic loading of cores - Start a core automatically if a request comes in for a
"stopped" core.
   1. LRU Core Loading/Unloading - As there are a large number of cores, all the cores cannot
be kept loaded always. There has to be an upper limit beyond which we need to unload a few
cores.
-  1. Automatic allotment of dataDir for cores - If the number of cores is too high, all the
cores' dataDirs cannot live in the same directory. There is an upper limit on the number of
directories you can create in a directory w/o affecting performance.
+  1. Automatic allotment of dataDir for cores - If the number of cores is too high, all the
cores' dataDirs cannot live in the same directory. There is an upper limit on the number of
directories you can create in a directory w/o affecting performance. Erick Erickson claims
that this is taken care of by file walking, the resulting tree structure can be as deep as
required to limit the number of files in any particular directory, so all cores live under
<solr_home>.
  
  = Issues =
   * [[https://issues.apache.org/jira/browse/SOLR-1293|SOLR-1293]] - Support for large number
of cores and faster loading/unloading of cores. This issue has many child issues focusing
on individual changes:

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