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Date: Thu, 21 Jul 2011 14:47:36 +0530
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Subject: Re: Memtables stored in which location
From: CASSANDRA learner <cassandralearner@gmail.com>
To: user@cassandra.apache.org
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Hi,

You r right but i too have some concerns...

Any ways , some where memtable has to be stored right, like we say memtable
data is flushed to create sstable on disk.
Exactly from which location or memory it will be getting from. is it like an
objects streams or like it is storing the values in commitlog.
my next question is , data is written to commit log. all the data is
available here, and the sstable are getting created on disk, then where and
when these memtables are coming into picture

On Thu, Jul 21, 2011 at 1:44 PM, samal <samal@wakya.in> wrote:

> SSTable is stored on disk not memtable.
>
> Memtable is memory representation of data, which is on flush to create
> SSTable on disk.
>
> This is the location where SSTable is stored
> https://github.com/apache/cassandra/blob/trunk/conf/cassandra.yaml#L71
>
>
> Where as Commitlog which is back up (log) for memtable replaying store in
> https://github.com/apache/cassandra/blob/trunk/conf/cassandra.yaml#L75
> location.
>
> Once the all memtable is flushed to disk, new commit log segment is
> created.
>
> On Thu, Jul 21, 2011 at 1:12 PM, Abdul Haq Shaik <
> abdulsk.cassandra@gmail.com> wrote:
>
>> Hi,
>>
>> Can you please let me know where exactly the memtables are getting stored.
>> I wanted to know the physical location
>>
>
>

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Hi,<br>
<br>You r right but i too have some concerns...<br><br>
Any ways , some where memtable has to be stored right, like we say memtable=
 data is flushed to create sstable on disk.<br>
Exactly from which location or memory it will be getting from. is it like a=
n objects streams or like it is storing the values in commitlog.<br>my next=
 question is , data is written to commit log. all the data is available her=
e, and the sstable are getting created on disk, then where and when these m=
emtables are coming into picture<br>
<br><div class=3D"gmail_quote">On Thu, Jul 21, 2011 at 1:44 PM, samal <span=
 dir=3D"ltr">&lt;<a href=3D"mailto:samal@wakya.in">samal@wakya.in</a>&gt;</=
span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8e=
x;border-left:1px #ccc solid;padding-left:1ex;">
SSTable is stored on disk not memtable.<div><br><div>Memtable is memory rep=
resentation of data, which is on flush to create SSTable on disk.</div><div=
><br></div><div>This is the location where SSTable is stored</div><div>
<a href=3D"https://github.com/apache/cassandra/blob/trunk/conf/cassandra.ya=
ml#L71" target=3D"_blank">https://github.com/apache/cassandra/blob/trunk/co=
nf/cassandra.yaml#L71</a></div>
<div><br></div><div><br></div><div>Where as Commitlog which is back up (log=
) for memtable replaying store in<br><a href=3D"https://github.com/apache/c=
assandra/blob/trunk/conf/cassandra.yaml#L75" target=3D"_blank">https://gith=
ub.com/apache/cassandra/blob/trunk/conf/cassandra.yaml#L75</a></div>

<div>location.</div><div><br></div><div>Once the all memtable is flushed to=
 disk, new commit log segment is created.</div><div class=3D"im"><div><br><=
div class=3D"gmail_quote">On Thu, Jul 21, 2011 at 1:12 PM, Abdul Haq Shaik =
<span dir=3D"ltr">&lt;<a href=3D"mailto:abdulsk.cassandra@gmail.com" target=
=3D"_blank">abdulsk.cassandra@gmail.com</a>&gt;</span> wrote:<br>

<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">Hi,<div><br></div><div>Can you please let me=
 know where exactly the memtables are getting stored. I wanted to know the =
physical location</div>


</blockquote></div><br></div></div></div>
</blockquote></div><br>

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