To: user@cassandra.apache.orgmailto:user@cassandra.apache.org
user@cassandra.apache.orgmailto:user@cassandra.apache.org
Subject: Re: memtable mem usage off by 10?
In that case I would assume the problem is that for some reason JAMM is failing
to load, and so the liveRatio it would ordinarily
@cassandra.apache.orgmailto:user@cassandra.apache.org
Subject: Re: memtable mem usage off by 10?
In that case I would assume the problem is that for some reason JAMM is failing
to load, and so the liveRatio it would ordinarily calculate is defaulting to 10
- are you using the bundled cassandra launch scripts
@cassandra.apache.org
Subject: Re: memtable mem usage off by 10?
In that case I would assume the problem is that for some reason JAMM is
failing to load, and so the liveRatio it would ordinarily calculate is
defaulting to 10 - are you using the bundled cassandra launch scripts?
On 4 June 2014 15:51
If you are storing small values in your columns, the object overhead is
very substantial. So what is 400Mb on disk may well be 4Gb in memtables, so
if you are measuring the memtable size by the resulting sstable size, you
are not getting an accurate picture. This overhead has been reduced by
about
Smith belliottsm...@datastax.com
Sent: Wednesday, June 4, 2014 11:56 AM
To: user@cassandra.apache.org
Subject: Re: memtable mem usage off by 10?
If you are storing small values in your columns, the object overhead is very
substantial. So what is 400Mb on disk may well be 4Gb in memtables, so if you
*To:* user@cassandra.apache.org
*Subject:* Re: memtable mem usage off by 10?
If you are storing small values in your columns, the object overhead is
very substantial. So what is 400Mb on disk may well be 4Gb in memtables, so
if you are measuring the memtable size by the resulting sstable size, you
From: Benedict Elliott Smith belliottsm...@datastax.com
Sent: Wednesday, June 4, 2014 12:33 PM
To: user@cassandra.apache.org
Subject: Re: memtable mem usage off by 10?
These measurements tell you the amount of user data stored in the memtables,
not the amount of heap used to store it, so the same
--
*From:* Benedict Elliott Smith belliottsm...@datastax.com
*Sent:* Wednesday, June 4, 2014 12:33 PM
*To:* user@cassandra.apache.org
*Subject:* Re: memtable mem usage off by 10?
These measurements tell you the amount of user data stored in the
memtables, not the amount of heap used
, 2014 1:19 PM
To: user@cassandra.apache.org
Subject: Re: memtable mem usage off by 10?
Unfortunately it looks like the heap utilisation of memtables was not exposed
in earlier versions, because they only maintained an estimate.
The overhead scales linearly with the amount of data in your memtables
respected.
This shouldn't be possible.
--
*From:* Benedict Elliott Smith belliottsm...@datastax.com
*Sent:* Wednesday, June 4, 2014 1:19 PM
*To:* user@cassandra.apache.org
*Subject:* Re: memtable mem usage off by 10?
Unfortunately it looks like the heap
...@datastax.com
Sent: Wednesday, June 4, 2014 2:07 PM
To: user@cassandra.apache.org
Subject: Re: memtable mem usage off by 10?
I'm confused: there is no flush_largest_memtables_at property in C* 2.0?
On 4 June 2014 12:55, Idrén, Johan
johan.id...@dice.semailto:johan.id...@dice.se wrote:
Ok, so
:26 AM
To: user@cassandra.apache.org
Subject: RE: memtable mem usage off by 10?
Oh, well ok that explains why I'm not seeing a flush at 750MB. Sorry, I was
going by the documentation. It claims that the property is around in 2.0.
If we skip that, part of my reply still makes sense:
Having
/configCassandra_yaml_r.html
And I don’t find a Jira issue mentioning it being removed, so... what’s
the full story there?!
-- Jack Krupansky
*From:* Idrén, Johan johan.id...@dice.se
*Sent:* Wednesday, June 4, 2014 8:26 AM
*To:* user@cassandra.apache.org
*Subject:* RE: memtable mem usage off by 10?
Oh
@cassandra.apache.orgmailto:user@cassandra.apache.org
Date: Wednesday 4 June 2014 16:36
To: user@cassandra.apache.orgmailto:user@cassandra.apache.org
user@cassandra.apache.orgmailto:user@cassandra.apache.org
Subject: Re: memtable mem usage off by 10?
Oh, well ok that explains why I'm not seeing a flush
And sorry that the doc confused you as well!
-- Jack Krupansky
From: Idrén, Johan
Sent: Wednesday, June 4, 2014 10:51 AM
To: user@cassandra.apache.org
Subject: Re: memtable mem usage off by 10?
I wasn’t supplying it, I was assuming it was using the default. It does not
exist in my config
user@cassandra.apache.org
Subject: Re: memtable mem usage off by 10?
Oh, well ok that explains why I'm not seeing a flush at 750MB. Sorry,
I was going by the documentation. It claims that the property is around in
2.0.
But something else is wrong, as Cassandra will crash if you supply
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