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From Denis Magda <dma...@gridgain.com>
Subject Re: Off-Heap SQL Indexes
Date Thu, 03 Nov 2016 17:22:59 GMT
Sergi,

Referring to your response and the source code I should say that, in fact, the documentation
has to state the following:

“To place both data and indexes in off heap memory CacheConfiguration.setMemoryMode has
to be set to one of off heap modes and CacheConfiguration.setOffHeapMaxMemory has to be set
to a value different from -1 (disabled). If at least one of these conditions is not met then
both data and indexes will be located in on heap memory”

Is this statement correct?

—
Denis

> On Nov 3, 2016, at 2:53 AM, Sergi Vladykin <sergi.vladykin@gmail.com> wrote:
> 
> Prachi,
> 
> In [2] we refer to the same CacheConfiguration.setOffHeapMaxMemory
> property, so [1] is correct. If setOffHeapMaxMemory is disabled (set to
> -1), then indexes will never be stored offheap, regardless of setMemoryMode
> setting.
> 
> Probably we have to change [2] to make it clear, that it is about
> setOffHeapMaxMemory
> but not about setMemoryMode.
> 
> Sergi
> 
> 
> 2016-11-03 2:25 GMT+03:00 Prachi Garg <pgarg@gridgain.com>:
> 
>> Engineers,
>> 
>> I was going through documentation for Off-Heap SQL Indexes
>> <https://apacheignite.readme.io/docs/sql-queries#off-heap-sql-indexes> and
>> found two contradicting statements-
>> 
>> According to [1] -  " `CacheConfiguration.setOffHeapMaxMemory` is the only
>> property to enable or disable off-heap indexing. While
>> CacheConfiguration.setMemoryMode is used to configure off-heap memory
>> <https://apacheignite.readme.io/v1.7/docs/off-heap-memory>, it does not
>> have any effect on indexing."
>> 
>> According to [2] -  "Note that when off-heap memory is configured, Ignite
>> will store query indexes off-heap as well."
>> 
>> 
>> Which one is true?
>> 
>> [1] - https://apacheignite.readme.io/docs/sql-queries#off-heap-sql-indexes
>> 
>> [2] - http://apacheignite.gridgain.org/docs/off-heap-memory
>> 
>> 
>> Thanks,
>> 
>> -Prachi
>> 


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