You are right, jvm gc is for memory.
In cassandra, there is a small trick called *PhantomReference*, which will
be called when jvm gc. And deletion is actually done in PhantomReference.
2010/12/2 Ying Tang
> @Chen Xinli
> "and mark old sstables as deleted which will be deleted w
t; (introduced in 0.6.6 and
>>> recent 0.7 betas/rcs), major compactions where the only ones that removed
>>> the
>>> tombstones (see http://wiki.apache.org/cassandra/DistributedDeletes)
>>> and this is the
>>> reason major compaction exists. Now, with #107
gc, or node restarted.
> 3. When gc be called ? Every time compaction been called?
>
GC has nothing to do with compaction, you may mistake the two conceptions
>
>
>
> --
> Best regards,
>
> Ivy Tang
>
>
>
>
--
Best Regards,
Chen Xinli
查询是完全基于当天计算的数据吗 还是基于当天和历史数据的合并？
Nanheng Wu 编写：
Hi,
Our team decided to use Cassandra as storage solution to a dataset.
I am very new to the NoSQL world and Cassandra so I am hoping to get
some help from the community: The dataset is pretty simple, we have
for each key a number of columns with
keep it simple, I don't want to use autobootstrap,
noderepair, removetoken, etc
--
Best Regards,
Chen Xinli
C++ to generate
> keys, not normal distribution). Here are results:
>
> size of data in db -> reads per second
> 21 GB -> 340
> 400 GB -> 200
>
> So I've got more reads from single MySQL with 400GB of data than from
> 8 machines storing about 266GB. This doesn't look good. What am I
> doing wrong? :)
>
> Disable row cache is ok, but key cache should be enabled. It use little
memory, but reading peformance will improve a lot.
Cheers,
> Kamil
>
--
Best Regards,
Chen Xinli
me of.
> If it is possible, can anyone point me in the right direction of how to do
> this?
> I'm using 0.6.4 with the thrift interface in java, i use hector but i'd
> much prefer knowing how its done via thrift first :)
> thanks
>
--
Best Regards,
Chen Xinli
-30 at 05:49 -0700, Mike Peters wrote:
>
> Chen,
>
> Have you considered using http://www.slideshare.net/otisg/lucandra Lucandra
> for Inbox search?
>
> We have a similar setup and are currently looking into using Lucandra over
> implementing the searching ourselves with pure Cassandra.
>
>
--
Best Regards,
Chen Xinli
I rather just write all the time (given that cassandra is so fast
> on write) or should I read and write only if not present?
>
> Cheers,
> Daniel
--
Best Regards,
Chen Xinli
esent, warrant and/or guarantee,
> > that the integrity of this communication has been maintained nor that the
> > communication is free of errors, virus, interception or interference.
> >
>
>
>
> --
> Jonathan Ellis
> Project Chair, Apache Cassandra
> co-founder of Riptano, the source for professional Cassandra support
> http://riptano.com
>
> Impetus is sponsoring 'Hadoop India User Group Meet Up'- a technology
> un-conference on July 31, 2010 at Impetus Office, Noida. The event will shed
> light on Hadoop technology and channelized efforts to develop an active
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>
> Click http://www.impetus.com/ to know more. Follow our updates on
> www.twitter.com/impetuscalling .
>
>
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Best Regards,
Chen Xinli
king every row in db if it match my bounding box.
>
> But there are a lot more than 700 keys.. and if i set a higher count, the
> get_range_slice get a Timeout Exception.
>
> Any ideas?
>
> Best Regards
> Jone
>
--
Best Regards,
Chen Xinli
doing hinted
handoff, then a reading is forward to this node, the data returned is out of
date.
The node failure is not frequently; if it happens unfortunately, we should
keep the reading consitency.
2010/8/18 Benjamin Black
> On Tue, Aug 17, 2010 at 7:55 PM, Chen Xinli wrote:
>
I'm using cassandra 0.6.4; there's a configuration option
DoConsistencyChecksBoolean in storage-conf.xml.
Is't that for read-repair ?
I will do a test for WRITE QUORUM, READ.ONE if it can meet our requirements.
2010/8/18 Edward Capriolo
> On Tue, Aug 17, 2010 at 10:55 PM,
Thanks for any advices!
--
Best Regards,
Chen Xinli
during error.
>
> Some kind of lock service maybe help, like ZooKeeper.
>
> Regards
> -Santal
>
>
>
> 2010/7/19 Chen Xinli
>
> Hi,
>>
>> I want to implement goods search with cassandra; and I have some
>> confusings. Can someone help me out?
>&g
es me confusing is that: insertion through thrift client and reading
through using cassandra directly, is data consistency promised and how?
Any help is appreciated. Thanks!
--
Best Regards,
Chen Xinli
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