t*********r
发帖数: 387 | 1 > Kafka不是王道，这个是为了解释partition的时候出现master election就会出现
data loss
> 我不知道你怎么看的这篇文章，Jay要解释的是这种情况无法避免，唯一解决的
方法就是要么放弃A，要么就忍这个data loss。
> 你的意思是你凭空就能搞一个牛逼的系统出来，还是说你比Jay这些人还牛逼。
我可没说我如何，呵呵
我发帖只是说CAP是个伪概念拿来忽悠人说C和A不可兼得的。我也不认为kafka design
导致的tradeoff是必要的。
来个具体例子吧：
> The issue Kyle demonstrates makes for a good illustration. In this
scenario Kyle kills off all but one node in the ISR, then writes to the
remaining node (which is now the leader), then kills this node and brings
back the other nodes. I actually ... 阅读全帖 |
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S*****s
发帖数: 7520 | 2 我试着翻译一下，不知道这段的历史背景。
licet，这是一个谦辞，在拉丁语中这属于“缺陷动词”也就是没有完全变化形式的，
就是 it is may allowed, 如果可能的话。诚惶诚恐的意思。
接下来是一个很长的句子，对于长句，一定要抓住两点，一个是动词，这是题眼，拉丁
语动词和人称是紧密结合的。这个题眼就是"liqueat"
这是第三人称单数的虚拟式，意思是看起来很明显，lequeat百分百要接一个动词不定式
，也就是reddi，这是一个被动的不定式，意思是送出，投降，这里应该是送出。剩下的
是这个句子的枝干，但也比较复杂。
ingressus et processus两个被动分词，强调正在被实施的。Tartarorum是属格，鞑靼
人的匈牙利。
intrantium in ignominia Crucifixi 正在对基督圣战十字军的侮辱和不尊。pernicie
m stragemque两个词意思同意，强调暴行。que是屈折语的典型表示同位连接。non min
imam 双重否定，表示极度。per presens opusculum vestro nomini 我们眼见正在发生... 阅读全帖 |
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l****z
发帖数: 29846 | 3 Republican senators in Wisconsin Wednesday night maneuvered around Democrats
to pass legislation stripping public employees' unions of collective-
bargaining rights, setting the stage for other states to pursue similar
steps in one of the broadest challenges to organized labor in decades.
A vote on Republican Gov. Scott Walker's "budget-repair" bill had been
stymied since Feb. 17 when 14 Democratic senators left the state, kicking
off a rancorous, three-week political drama. Without the Democrat... 阅读全帖 |
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l****z
发帖数: 29846 | 4 By MELANIE TROTTMAN
A federal appeals court on Friday ruled that President Barack Obama violated
the Constitution when he bypassed the Senate to fill vacancies on the
National Labor Relations Board.
A federal appeals court ruled that President Obama violated the Constitution
when he bypassed the Senate to fill vacancies on a labor panel. Aaron
Zitner reports on Lunch Break. Photo: AP.
The three-judge panel said that as a result, the labor-relations board has
lacked the quorum it needs to conduct... 阅读全帖 |
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a*****1
发帖数: 3817 | 5 自己去看美国宪法
United States Constitution
From Wikipedia, the free encyclopedia
Jump to: navigation, search
United States Constitution
Constitution of the United States, page 1.jpg
Page one of the original copy of the Constitution
Created
September 17, 1787
Ratified
June 21, 1788
Date effective
March 4, 1789; 227 years ago
Location
National Archives,
Washington, D.C.
Author(s)
Philadelphia Convention
Signatories
39 of the 55 delegates
Purpose
To replace the Articles of Confederation (177... 阅读全帖 |
|
a*****1
发帖数: 3817 | 6 自己去看美国宪法
United States Constitution
From Wikipedia, the free encyclopedia
Jump to: navigation, search
United States Constitution
Constitution of the United States, page 1.jpg
Page one of the original copy of the Constitution
Created
September 17, 1787
Ratified
June 21, 1788
Date effective
March 4, 1789; 227 years ago
Location
National Archives,
Washington, D.C.
Author(s)
Philadelphia Convention
Signatories
39 of the 55 delegates
Purpose
To replace the Articles of Confederation (177... 阅读全帖 |
|
a*****1
发帖数: 3817 | 7 自己去看美国宪法
United States Constitution
From Wikipedia, the free encyclopedia
Jump to: navigation, search
United States Constitution
Constitution of the United States, page 1.jpg
Page one of the original copy of the Constitution
Created
September 17, 1787
Ratified
June 21, 1788
Date effective
March 4, 1789; 227 years ago
Location
National Archives,
Washington, D.C.
Author(s)
Philadelphia Convention
Signatories
39 of the 55 delegates
Purpose
To replace the Articles of Confederation (1777)
This articl... 阅读全帖 |
|
t*********r
发帖数: 387 | 8 > Cassandra tunnable consistency也不是你说的这种C，tune来tune去的结果是只能
让得到的结果是正确的概率更高而已，小数点后面几个9的差别。跟你想要的C根本不是
一回事。
你确定跑个QUORUM也不能达到我所说的C？来个例子举证。
当然所有机子挂了我也没办法。
> A这个东西其实是你能接受的latency到底有多少，可以完全在有machine failure的
这段时间停止process任何request，然后等到完全恢复之后再继续，如果无限大的
latency还可以被认为是A，那就能实现A。
理论上A跟LATENCY没半毛钱关系。我不喜欢胡扯，直接引用文献：http://webpages.cs.luc.edu/~pld/353/gilbert_lynch_brewer_proof.pdf
Available Data Objects
For a distributed system to be continuously available, every request
received by a non-failing node in the sy... 阅读全帖 |
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w**z
发帖数: 8232 | 9 C* returns true to client if you are able to write 2 replicates. In case the
last one fail, C* will handle that for you. It will resolve it at read time
, given the fact you are reading also quorum. It will also do the read
repair, and you run node repair to make the data "eventual consistent"
So read quorum + write quorum give you the strong consistency. |
|
l****z
发帖数: 29846 | 10 【 以下文字转载自 Joke 讨论区 】
发信人: daemonself (mit行为艺术专业博士后导师), 信区: Joke
标 题: Re: 政非笑捷报:大统领医改初见成效
发信站: BBS 未名空间站 (Thu Oct 22 14:18:41 2015, 美东)
Hospital stocks tanked Thursday after another big chain warned Wall Street
that it won't meet third-quarter earnings expectations.
Community Health Systems said Wednesday after markets closed that patient
admissions fell about 2 percent at its established locations in the quarter,
and it saw a decrease in the percentage of people covered by commercial
insurance,... 阅读全帖 |
|
b*****d
发帖数: 61690 | 11 50:49不需要Pence break the tie. 49:49需要pence breaks the tie. 51个参议员就
可以形成Quorum,就可以投票。只要quorum的简单多数就可以通过。所以如果99个参议
员出席，50:49就过了。49:49:1，Pence break tie变成50-49-1通过。 |
|
发帖数: 1 | 12 The Quorum
This is NOT based on a true story, it is THE true story.
This fall, on a mission to block supreme justice nominee, Senate Democrats
are in action. From the Capitol Hill to the White House, from main stream
media to social network, from Senate Judiciary Committee to FBI, 93 days,
100 senators, 2 victims, 0 witness. From Alaska to West Virginia, from
California to Maine, from Palo Alto to Washington D.C., more than 20 million
people watched it live.
New York Times "A blow to the Court's... 阅读全帖 |
|
z******g
发帖数: 271 | 13 现在许多大型系统中都会用到eventual consistency，实际上就是通过牺牲
consistency来获得high writing availability。比如cassandra支持多种consistency
level：ONE（保证一个replica读写成功，writing availability最高），QUORUM（所
有replica达成consensus），LOCAL QUORUM（假设你读写上海data center的数据，只
需该data center中replica达成consensus）等等。
时间方面一般通过vector clock来保证total ordering，不过cassandra用的好像是
timestamp。 |
|
r*****s
发帖数: 1815 | 14 来自主题: JobHunting版 - fb设计题 #1 QPS:
Probably 10k~100k concurrent access (my guess)
Meaning we need to heavily cache the data. We may need some write through
cache in place. Well sharded.
resource wise, I'm not worried at all. for cache https://redis.io/topics/
benchmarks) redis can be super fast. for persistency with nosql we can
achieve almost infinite scalability.
our system should provide the following APIs:
- Like(user, post)
- Unlike(user, post)
- Liked(user, post)
- CountLikes(post)
Extra:
- RecentLikes(user)
- Frie... 阅读全帖 |
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f*******8
发帖数: 1430 | 15 HR 2189: 已经通过了House. 马上Senate Judiciary就要表决了。3012会经历相同的过
程。
ALL ACTIONS: 6/15/2011:
Referred to the House Committee on the Judiciary.
8/1/2011:
Committee Consideration and Mark-up Session Held.
8/1/2011:
Ordered to be Reported by Voice Vote.
9/7/2011 7:01pm:
Reported by the Committee on Judiciary. H. Rept. 112-198.
9/7/2011 7:01pm:
Placed on the Union Calendar, Calendar No. 127.
9/20/2011 2:18pm:
Mr. Smith (TX) moved to suspend the rules and pass the bill.
9/20/2011 2:18pm:
Considered under susp... 阅读全帖 |
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d********f
发帖数: 43471 | 16 Hospital stocks tanked Thursday after another big chain warned Wall Street
that it won't meet third-quarter earnings expectations.
Community Health Systems said Wednesday after markets closed that patient
admissions fell about 2 percent at its established locations in the quarter,
and it saw a decrease in the percentage of people covered by commercial
insurance, which offers the best reimbursement. The Franklin, Tenn.-based
chain expects adjusted earnings for the quarter that ends Sept. 30 to be... 阅读全帖 |
|
u****f
发帖数: 46 | 17 新一届的中国科大校友基金会理事会的选举的投票将于美东时间2011年11月1日开始，
11月14日截止。请各位校友基金会会员积极参选。
如果参选人数没有达到327人的话，该选举将作废。根据“USTCAF Bylaw 2011”选举
委员会必须另外组织一次选举，重新提名候选人，大多数现在的候选人将不能再次参选。
这些会使校友基金会的运行停顿至少三个月的时间。所以请各位会员在各自的校友圈内互
相提醒，在未来两个星期内及时投票。谢谢大家。
========================
Dear USTCAF Members:
This is the email ballot for the Election 2011 of USTCAF.
Please take a little patience and read through the whole message.
VOTING PERIOD:
(1) From 00:00 on November 1, 2011 to 23:59 November 14, 2011, both in
USA Eastern Time.
(2) Yo... 阅读全帖 |
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P*****x
发帖数: 72 | 18 we have a cluster on EC2. replication factor 3, simple strategy, quorum read
, quorum write. GC grace using default and node tool repair once a week
Cassandra V1.2.1 hector api 1.0.5
we have a column family used for indexing and all columns are dynamic
composite columns. Here is strange thing, when we do lots of writes and
deletes. Somehow lots of deletes are simply like never happened. Even later
we issued the same comments again, we still see some of columns not being
deleted. If we do range s... 阅读全帖 |
|
g*****g
发帖数: 34805 | 19 再看我的设计在这种情况下如何，这是我们跑在产品环境里的设计。
同样三DC，独立供电，独立网络，专线连接(EC2上叫做同一region3个zone)
web和Cassandra是同样在DC里平分的，没有主次之分，这样既不浪费，没有standby，
又达到高throughput。
zone1和zone2,3断开的时候。从zone1 web发出的订单，因为不能达到quorum写(同步写
两zone的cassandra，都ack为成功)，提交会立刻失败，错误返回到用户。当用户重新
提交的时候，有2/3的概率能提交到zone2/3而成功。
这时候zone1着火，玩完，连web也没了。所有流量被导向zone2,zone3，因为符合
quorum写，所有订单成功。 |
|
g*****g
发帖数: 34805 | 20 CAP证明我不会，但牛人从理论上已经证明了。实践上，没有不能partition的网络，所以
必须CA有妥协。Cassandra是以C为代价的。partition的时候，数据没有立刻一致，是
在quorum读的时候重新一致的，而quorum写保证了多DC的同步写。
可惜魏老师是内存数据库，又要单机处理百万数据，multicast多DC同步写等ack做不到
。所以availability就要牺牲一点了，该丢数据的时候就得丢。
魏老师打多少补丁，只不过是永动机的多少种设计罢了。 |
|
w***g
发帖数: 5958 | 21 quorum read/write 延时会成倍增加啊。其实只要quorum write就行了，但那样也有点
不值得，毕竟只要绝大部分时候consistent就行。但是因为写和读之间的时间非常短，
怕到不了eventual那一步，那样的话inconsistent就会成为常态。
话说有人知道eventual是几秒吗？貌似facebook也是受不了这个eventual改用别的了。 |
|
w**z
发帖数: 8232 | 22 比谁差一大截？
我们quorum write latency 90th percentile<2ms， quorum read 90th percentile <
10ms 几十ms 怎么都够用了
我们从 ws 出去 99th percentile read 也就 30ms, 99th percentile write < 5ms
看一下你的C＊ tune 好没有， schema 怎样，不觉得read／write consistencey 会有
多大影响。
读。 |
|
g*********5
发帖数: 2533 | 23 Introduction:
Cells that simultaneously secrete and sense the same signaling molecule are
ubiquitous. Bacteria sense a quorum by secreting and sensing an autoinducer;
T cells induce a monoclonal
immune response by secreting and sensing a cytokine; and epithelial cells
can become cancerous through misregulated secreting and sensing of a growth
factor. Many of these cells use the same core signaling-circuit motif to
realize a diverse repertoire of biological functions. The full range of
functions ... 阅读全帖 |
|
z*******n
发帖数: 1034 | 24 Facebook Announces Apollo, a New NoSQL Database for On-line Low Latency
Storage
by Charles Humble on Jun 13, 2014 | Discuss
Speaking at QCon New York on Wednesday Jeff Johnson, from the core data
group at Facebook, announced Apollo, Facebook’s Paxos-like NoSQL database.
Written in C++11 on top of the Apache Thrift 2 RPC framework, Apollo is a
hierarchical storage system where all the data is split into shards, very
much analogous to region servers in HBase. The sweet-spot for it, Johnson
expl... 阅读全帖 |
|
e****i
发帖数: 2152 | 25 【 以下文字转载自 Military 讨论区 】
发信人: erkuai (三天不上bbs,赶得上刘少奇), 信区: Military
标 题: On the Jews and Their Lies, 1543
发信站: BBS 未名空间站 (Wed Jan 12 23:21:23 2011, 美东)
by Martin Luther (1483-1546)
Translated by Martin H. Bertram
copyright © 1971 Fortress Press & Augsburg Fortress - On the Jews and
Their Lies is from Luther’s Works Volume 47. Augsburg Fortress is the
publishing ministry of the Evangelical Lutheran Church in America.
Funded through sales revenue, Augsburg Fortress is called to provide
produ... 阅读全帖 |
|
e****i
发帖数: 2152 | 26 by Martin Luther (1483-1546)
Translated by Martin H. Bertram
copyright © 1971 Fortress Press & Augsburg Fortress - On the Jews and
Their Lies is from Luther’s Works Volume 47. Augsburg Fortress is the
publishing ministry of the Evangelical Lutheran Church in America.
Funded through sales revenue, Augsburg Fortress is called to provide
products and services that communicate the Gospel, enhance faith, and
enrich the life of the Christian community from a Lutheran perspective.
Part I
I had mad... 阅读全帖 |
|
b*****d
发帖数: 61690 | 27 美国中西部革命风起云涌
In Indiana, House Democrats tore a page out of the Wisconsin book by walking
out on a Republican-supported bill that would reduce private-sector union
rights.
Republicans, who make up 60 of 100 House seats, lacked the two-thirds
majority needed for a quorum.
"It is incredible that this legislation is being described as a step toward
reform, when in fact, it will mark a huge step backward for most Hoosiers,"
said House Democratic Minority Leader B. Patrick Bauer in a written
statement... 阅读全帖 |
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s*********8
发帖数: 901 | 28 Wis. Assembly passes bill taking away union rights
MADISON, Wis. — The Wisconsin Assembly early Friday passed a bill that
would strip most public workers of their collective bargaining rights — the
first significant action on the new Republican governor's plan.
Other political news of note Some Republicans soften tough talk on unions
With a wary eye on Wisconsin, Republican leaders in several states are
toning down the tough talk against public employee unions and, in some cases
, abandoning ant... 阅读全帖 |
|
b*****d
发帖数: 61690 | 29 跑走的wisconsin民主党参议员要被罚款了：一天１百美元
CNN -- Wisconsin Senate Republicans on Wednesday adopted a resolution that
would fine missing Democrats $100 every day they remain away from the state
capital, Senate Majority Leader Scott Fitzgerald told reporters.
The measure could also force the absentee lawmakers to forfeit their parking
spaces and discretionary spending accounts.
The Democratic lawmakers were not immediately available for comment.
Fourteen Democratic state senators have fled to Illinois to pre... 阅读全帖 |
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s*******d
发帖数: 3991 | 30 共和党真能寒蝉人
要是哪个民主党议员就为这一年3万块跑回来，以后还怎么混
state
parking
quorum |
|
D*****i
发帖数: 8922 | 31 能翻译一下这个么？
Licet, ut liqueat dominationi vestre ingressus et processus Tartarorum
Hungariam intrantium in ignominia Crucifixi, perniciem stragemque non
minimam populi christiani per presens opusculum vestro nomini reddi, de
gestis ipsorum sine falsitatis admixtione collectum, quod cum diligentia
perlegatis. Multa quidem invenietis in eo, que meo subiacuerunt aspectui,
plurimaque propriis palpavi manibus, nonnullaque a fide dignis didici, in
quorum illa fuerunt presentia perpetrata. |
|
m***y
发帖数: 14763 | 32 只是技术层面。
比如town meeting，quorum,还跟五月花刚来时一模一样。
大家都记得爱迪生第一个发明吧？投票机，在他看来，可以提高投票效率，结果遭到
establishment的嘲笑，爷要的就是低效。气的爱爷发誓再也不搅和政治。
可见这一套在一百年前就被公认为低效无能，可是一百年后，还在用。 |
|
k*****e
发帖数: 22013 | 33 转一个wiki上的描述
House of Representatives
In the House of Representatives, the filibuster (the right to unlimited
debate) was used until 1842, when a permanent rule limiting the duration of
debate was created. The disappearing quorum was a tactic used by the
minority until an 1890 rule eliminated it. As the membership of the House
grew much larger than the Senate, the House has acted earlier to control
floor debate and the delay and blocking of floor votes.
Senate
Main article: Filibuster in the U.S |
|
L*******e
发帖数: 2202 | 34 http://news.advocate.com/post/15571734525/gayest-cities-in-amer
Advocate mag 评的，现在也引起了不少争议。在utah这个摩门保守州的最gay城市，让
人怀疑。
"最gay”城市评选有五花八门各种版本，杂志1月9日公布的今年结果是基于
一些非热门指标，例如某地当选LGBT官员、参加同性恋垒球大赛球队、同性恋书店以及
裸体瑜伽课的数量，及"国际皮革先生"半决赛参赛人数、跨性别反歧视法等，结果，犹
他州的盐湖城名列美国榜首。
15. Denver
"Denver is simultaneously outdoorsy and a rapidly growing metropolis,
and its attitude is exceptionally laid-back and gay-friendly. (Screw the
antigay zealots in nearby Colorado Springs.)"
14. Long Beach, Calif.
"Its pride celebr... 阅读全帖 |
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k*****e
发帖数: 22013 | 35 今天(8月1日星期五)乌干达宪法法庭刚刚废除了将同性性行为视为犯罪的法律。去年12
月份，议会发言人Rebecca Kadaga将反同提案交与公众投票，后经总统Yoweri
Museveni签字，提案生效。五位法官认为，在未达到议会支持的必须法定人数的情况下
将提案交予公众投票是非法的，因此该法律无效。
http://www.washingtonblade.com/2014/08/01/breaking-uganda-court
BREAKING: Uganda court strikes down anti-gay law
Uganda, gay news, Washington Blade
Ugandan human rights advocates earlier this year petitioned the Ugandan
Constitutional Court to block an anti-gay law the country’s president
signed last month. (Photo courtesy of Ellen Sturtz)
The C... 阅读全帖 |
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l****z
发帖数: 29846 | 36 http://news.yahoo.com/s/ap/20101219/ap_on_el_ge/us_census_redistricting
WASHINGTON – The 2010 census report coming out Tuesday will include a
boatload of good political news for Republicans and grim data for Democrats
hoping to re-elect President Barack Obama and rebound from last month's
devastating elections.
The population continues to shift from Democratic-leaning Rust Belt states
to Republican-leaning Sun Belt states, a trend the Census Bureau will detail
in its once-a-decade report to the ... 阅读全帖 |
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l****z
发帖数: 29846 | 37 First, Walker hasn’t “outlowed” unions, or even proposed outlawing them,
either. Walker’s proposal would restrict negotiations with non-law-
enforcement unions to wages only, and would require recertification votes
each year. It would also make Wisconsin a right-to-work state, ending
automatic deduction of union dues from paychecks and instead make them
voluntary. That may put unions in a tough position to justify their
continued representation, but it hardly outlaws the unions.
Besides, even... 阅读全帖 |
|
l****z
发帖数: 29846 | 38 AWOL Democrats Experiencing ‘Dissension in the Ranks’, Coalition To
Subvert Democratic Process May Be Cracking
Never again can the Democratic Party be seen as a democratic Party.
They have purposefully subverted the very democratic process that they are
named after in both WI and IL. But the heat is on them for doing so, na
thanks to the establishment MSM that refuses to hold their feet to the fire.
From Fox Nation via memeorandum: Exclusive: AWOL Democrats Experiencing ‘
Dissension in the Ranks... 阅读全帖 |
|
l****z
发帖数: 29846 | 39 Perry Orders Texas Agencies to Use E-Verify to Screen for Illegal Workers
via Breitbart Feed
AUSTIN, Texas -- Governor Rick Perry announced on Wednesday an executive
order requiring all Texas state agencies to use "E-Verify" to check the
employment eligibility of current and prospective employees. The
announcement was a reversal of his past public comments on the issue.
E-Verify is an online system that allows employers to search a government
database to determine if their employees are eligible... 阅读全帖 |
|
l****z
发帖数: 29846 | 40 16 states ask Obama admin to put power plant rules on hold
By JOSH LEDERMAN | August 5, 2015 | 5:15 PM EDT
WASHINGTON (AP) — The campaign to stop President Barack Obama's sweeping
emissions limits on power plants began taking shape Wednesday, as 16 states
asked the government to put the rules on hold while a Senate panel moved to
block them.
West Virginia Attorney General Patrick Morrisey, who is leading the charge
against the rules, banded together with 15 other state attorneys general in
a let... 阅读全帖 |
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w********9
发帖数: 64 | 41 Foreign reporters mailbox (2016)
h****[email protected]中国人权
信息发布：[email protected]/* */
[email protected]/* */国驻华使领馆
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n*****[email protected]新唐人
大纪元投稿Email(海外)：[email p... 阅读全帖 |
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m****s
发帖数: 8992 | 44 very nice. but you missed the very last line
The Quorum, Roll calling in a theater near you! Halloween 2019
million |
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m****s
发帖数: 8992 | 45 Liberty
Guns
Beer
Trump
Quorum
LGBTQ |
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D**S
发帖数: 24887 | 46 Liberty
Guns
Beer
Trump
Quorum
Assholes
LGBTQA |
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g********d
发帖数: 19244 | 47 ☆─────────────────────────────────────☆
qqzj (小车车) 于 (Tue Aug 27 23:40:31 2013, 美东) 提到:
事实篇
上次我引用IIHS 2011年的报告
www.iihs.org/externaldata/srdata/docs/sr4605.pdf
指出在2006-2009年Volvo唯一有数据的车型XC90每一百万车年死28个司机（仅仅司机）
。同时和XC90非常接近的Acura MDX死了11个司机。Ford Edge 表现很好，保护了所有
司机。另外本田的Odyssey和Pilot表现也很好，成绩是17和20。因为有人质疑这个数据
是否有足够说服力，我把更早的一个IIHS Death Rate报告找出来。这个是IIHS 2001和
2004年间的报告。
www.iihs.org/sr/pdfs/sr4204.pdf?
这里是数据：(All data are for base trim for 2004 model year base trim, with
price data from AOL Aut... 阅读全帖 |
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g********d
发帖数: 19244 | 48 ☆─────────────────────────────────────☆
MiandianKing (King of MianDian) 于 (Fri Sep 13 18:45:55 2013, 美东) 提到:
今天去试了试两辆车：
先说说自己的感觉，
宝马是sport package所以悬挂很硬，加速一般，过弯稍微快点也飘，感觉3系的方向盘
好廉价啊，没什么好的感觉，其次就是内饰塑料感极强。。动力上真没什么感觉有可圈
可点的地方（因为后来开了g37）
奔驰呢，首先感官上是喜欢，新的内饰设计确实比以前好看很多，引擎是turbo，有点
延迟，感觉加速挺舒服，悬挂也挺舒服。
可是版上一直都是大力推328i，我不知道为什么对这辆车都没什么特别的感觉，除了那
个bmw的logo。希望大牛答疑解惑
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zusanli (足三里) 于 (Fri Sep 13 18:58:20 2013, 美东) 提到:
我觉得CAMRY是你的最爱
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h*******8
发帖数: 29 | 49 有可能我想的比较简单了。
如果是订车系统的话，最终是不是考虑维护一个分布式的队列？
预定就是进队列(enq)，派出出租车是出队列(deq)。
由于这个队列是分布式的，可能要用到quorum consensus维护一致性，以及提供一定程
度的容错。 |
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p*****3
发帖数: 488 | 50 a + p用dynamoDB做例子比较好的感觉。
另外2pc不就是保证strong consistency而设计的吗，虽然会有commite失败的情况。感
觉paxos就是2pc的一个基于quorum的松散的实现，所以是partition tolerant.
DynamocDB为了保证任何时候可写，没有采用像paxos这样的大多数投票决策是否写的机
制，所以是high available和partition tolerant,但是不consistent |
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