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From Apache Wiki <wikidi...@apache.org>
Subject [Solr Wiki] Update of "SolrPerformanceProblems" by ShawnHeisey
Date Mon, 18 Dec 2017 16:48:30 GMT
Dear Wiki user,

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

The "SolrPerformanceProblems" page has been changed by ShawnHeisey:
https://wiki.apache.org/solr/SolrPerformanceProblems?action=diff&rev1=78&rev2=79

Comment:
third OOME option that's not really separate -- fixing bugs.

  
  The [[http://docs.oracle.com/cd/E19146-01/821-1834/ggkge/index.html|java heap]] is the memory
that a java program (such as Solr) requires in order to actually run.
  
- You might end up here if you are seeing [[SolrPerformanceFactors#OutOfMemoryErrors|OutOfMemoryError]]
(OOME) exceptions in your log.  If you are seeing this, your Solr install needs more of some
resource than it is allowed to access.  There are '''only''' two choices for dealing with
OOME.  One is to increase the size of the resource that is running out, the other is to reduce
the amount of that resource that Solr needs.  It is usually heap memory that triggers OOME,
but it could be some other resource, like the number of threads/processes that are allowed
to run.
+ You might end up here if you are seeing [[SolrPerformanceFactors#OutOfMemoryErrors|OutOfMemoryError]]
(OOME) exceptions in your log.  If you are seeing this, your Solr install needs more of some
resource than it is allowed to access.  There are '''only''' two choices for dealing with
OOME.  One is to increase the size of the resource that is running out, the other is to reduce
the amount of that resource that Solr needs.  It is usually heap memory that triggers OOME,
but it could be some other resource, like the number of threads/processes that are allowed
to run.  Some might say there's a third option: Fix the bug in the program that makes it require
so many resources.  That is not really a third option -- it falls under the second one.
  
  Certain configurations and conditions in Solr will require a lot of heap memory.  The following
list is incomplete, but in no particular order, these include:
  

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