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List:       cassandra-user
Subject:    Re: offheap component
From:       Tyler Hobbs <tyler () datastax ! com>
Date:       2013-12-31 17:25:42
Message-ID: CAAam9su1xEgsQAjDYL5=YHByRVTdTwKioCUz4EmeDr2jJJjryQ () mail ! gmail ! com
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On Tue, Dec 31, 2013 at 7:35 AM, Jason Wee <peichieh@gmail.com> wrote:

>
> In Cassandra 1.2 and later, the Bloom filter and compression offset map
> that store this metadata reside off-heap, greatly increasing the capacity
> per node of data that Cassandra can handle efficiently. In Cassandra 2.0,
> the partition summary also resides off-heap.
>
> How do we determine if a cassandra component is on heap or offheap?
>

Solely by the Cassandra version.  Are you asking about a particular
component not mentioned above?


>
> By off-heap, it means that the object is stored *not* in the allocated
> heap in jvm but in native memory?
>

That's correct.


-- 
Tyler Hobbs
DataStax <http://datastax.com/>

[Attachment #3 (text/html)]

<div dir="ltr"><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Dec 31, \
2013 at 7:35 AM, Jason Wee <span dir="ltr">&lt;<a href="mailto:peichieh@gmail.com" \
target="_blank">peichieh@gmail.com</a>&gt;</span> wrote:<br>

<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"><div><br></div><div>In Cassandra 1.2 and later, the Bloom \
filter and compression offset map that store this metadata reside off-heap, greatly \
increasing the capacity per node of data that Cassandra can handle efficiently. In \
Cassandra 2.0, the partition summary also resides off-heap.</div>


<div><br></div><div>How do we determine if a cassandra component is on heap or \
offheap? </div></blockquote><div><br>Solely by the Cassandra version.  Are you asking \
about a particular component not mentioned above?<br> </div>

<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"><div><br></div><div>By off-heap, it means that the object is \
stored *not* in the allocated heap in jvm but in native memory? </div>

</blockquote></div><br>That&#39;s correct.<br><br clear="all"><br>-- <br><font \
color="#888888">Tyler Hobbs<span></span><br> <a href="http://datastax.com/" \
target="_blank">DataStax</a><br></font> </div></div>



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