I have no explanation for the slower reads, but I have an hypothesis
on the writes.
Your iostat shows:
> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz
> avgqu-sz await svctm %util
> cciss/c0d0 0.00 908.50 0.00 110.50 0.00 8152.00
> 73.77
>
>
>> Barring this we (place where I work, Chango) will probably eventually fork
>> Cassandra to have a RESTful interface and use the Jetty async HTTP client to
>> connect to it. It's just ridiculous for us to have threads and associated
>> resources tied up on I/O-blocked operations.
>>
>
> We've
having 3 digit pending counts in both RRS and RMS is a danger sign.
It looks like you are i/o bound on reads, and possibly on writes as
well. (commitlog not on separate disk?)
On Mon, Aug 9, 2010 at 10:53 PM, Edward Capriolo wrote:
> On Mon, Aug 9, 2010 at 8:20 PM, Jonathan Ellis wrote:
>> what
Can you create a ticket for this?
On Mon, Aug 9, 2010 at 8:42 PM, Arya Goudarzi wrote:
> I've never run 0.6. I have been running of trunc with automatic svn update
> and build everyday at 2pm. One of my nodes got this error which lead to the
> same last error prior to build and restart today. H
Why is it that, if you set AutoBootStrap = false that it takes 60-90 seconds
for the node to announce itself?
I just want to understand what is going on during that time, and why that
specific timeframe (if there is a reason?)
On Tue, Aug 10, 2010 at 10:17 AM, S Ahmed wrote:
> Why is it that, if you set AutoBootStrap = false that it takes 60-90 seconds
> for the node to announce itself?
> I just want to understand what is going on during that time, and why that
> specific timeframe (if there is a reason?)
The bootstrap
> Is this pretty much all the files that Cassandra generates? (have I missed
> any)
I believe so. There will also be some temporary files (*-tmp*) during
compaction, and you'll see some *.Compacted marker files (empty IIRC).
> What exactly is stored in the "-Filter.db" files?
Those are bloom
Sure. https://issues.apache.org/jira/browse/CASSANDRA-1376
- Original Message -
From: "Jonathan Ellis"
To: user@cassandra.apache.org
Sent: Tuesday, August 10, 2010 7:05:31 AM
Subject: Re: COMMIT-LOG_WRITER Assertion Error
Can you create a ticket for this?
On Mon, Aug 9, 2010 at 8:42 PM,
Yeah, it has a BBU, and it is charged and on..
Very odd behavior, I'm stumped.
-JD
On Tue, Aug 10, 2010 at 12:28 AM, Peter Schuller <
peter.schul...@infidyne.com> wrote:
> I have no explanation for the slower reads, but I have an hypothesis
> on the writes.
>
> Your iostat shows:
>
> > Device:
Other activity, e.g. syslog?
Journaling at the FS level? you could try making a small partition
formatted as ext2.
On Tue, Aug 10, 2010 at 5:10 PM, Jeremy Davis
wrote:
> Yeah, it has a BBU, and it is charged and on..
> Very odd behavior, I'm stumped.
>
> -JD
>
> On Tue, Aug 10, 2010 at 12:28 AM,
> Yeah, it has a BBU, and it is charged and on..
> Very odd behavior, I'm stumped.
I advise double-checking raid volume settings and ensuring that policy
is truly such that the write cache is used. This may also be a
function of kernel driver settings depending on what RAID
controller/kernel versi
On 8/9/10 9:00 PM, S Ahmed wrote:
Is this pretty much all the files that Cassandra generates? (have I
missed any)
If you are running cassandra via the linux init scripts, you are setting
"outfile" for jsvc to be :
"
-outfile /var/log/$NAME/output.log \
"
And with :
"
-errfile "
I mentioned this today to a couple folks at Cassandra Summit, and thought
I'd solicit some more thoughts here.
Currently, the read stage includes checking row cache. So if your concurrent
reads is N and you have N reads reading from disk, the next read will block
until a disk read finishes, even i
On 8/9/10 9:00 PM, S Ahmed wrote:
What exactly is stored in the "-Filter.db" files?
Oh, didn't see this line.
http://wiki.apache.org/cassandra/ArchitectureOverview
"
Bloom filter (all keys in data file). A Bloom filter, is a
space-efficient probabilistic data structure that is used to test
14 matches
Mail list logo
