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There are two new attributes of a core (defaults in bold) and one new attribute for controlling how many transient cores are loaded at once.

• Wiki Markup
  transientCacheSize=\[NNN\]. If this limit is crossed, old cores marked 'transient="true"' are removed to make room on an LRU basis. Default size *Integer.MAX_VALUE*. _Only_ cores with "transient=true" are put in this cache, so specifying this attribute without having any cores marked as "transient" has no effect except wasting a bit of memory.

  • Having this size be less than the number of cores marked 'transient="true"' AND 'loadOnStartup="true"' should work, but it's wasteful since a bunch of cores will be loaded on startup then immediately unloaded after the cache fills up.
  • NOTE: All transient core information is read at startup and the "list of cores" is unbounded.
• old-style: this is an attribute of the <cores> tag
  • new-style: this is a child node of the <solr> tag, and looks like <int name="transientCacheSize">12</int>
    

• Wiki Markup
  loadOnStartup=\["*true*"|"false"\]. Whether the core should be completely loaded upon startup.

  • old-style: this is an attribute of each individual <core> tag
  • new-style: this is an entry in the "core.properties" file for each core.
    

• Wiki Markup
  transient=\["true"|"*false*"\]. Whether the core should be put in the LRU list of cores that may be unloaded. NOTE: When a core is unloaded, any outstanding operations (indexing or query) will be completed before the core is closed.

  • old-style: this is an attribute of each individual <core> tag
  • new-style: this is an entry in the "core.properties" file for each core.
    

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