Re: strengths and weaknesses of Gnutella
Michael Rogers <[email protected]> Fri, 09 Apr 2010 15:27:53 +0100
| Newsgroups | gmane.network.gnutella.devel |
|---|---|
| Message-ID | <[email protected]> |
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Arne Babenhauserheide wrote:
> - Weakness: No easy (and low overhead) way to do specialized searches (like
> regexp or metadata - like “show me articles written by Richard M.
> Stallman”).
This is something I miss when using Gnutella. Not so much metadata,
since the quality of most people's metadata seems to be pretty bad, but
slightly more expressive searches, such as "foo OR bar", "foo THEN bar",
or even "(foo THEN (bar OR baz)) AND NOT bam". Could we add something
like that to the protocol in a backwards-compatible way?
Imagine that we put the boolean expression in the GGEP block, for those
peers that understand it. Peers that understand boolean expressions will
use the expression to route the query; peers that don't will use the
query string. How should we create the query string from the boolean
expression, such that the query reaches any peer that might be able to
answer it (including old peers that don't understand boolean
expressions), and can pass through old ultrapeers that don't understand
boolean expressions, while keeping the search as efficient as possible?
AND is easy: the query string for "foo AND bar" is "foo bar".
Similarly, "foo THEN bar" -> "foo bar", which will collect some false
positives from old peers ("bar foo"), but no false negatives.
Terms with NOT can just be omitted from the query string, again
producing false positives but no false negatives: "foo NOT bar" ->
"foo". Remember that new peers will look at the expression and won't
bother sending responses that contain bar, so the false positives will
only come from old peers.
OR is the tricky one. If the boolean expression falls into two or more
disjoint parts, such as "(foo AND bar) OR (baz AND bam)", then we need
to create two separate queries, one for "foo AND bar" and another for
"baz AND bam". But what do we do, for example, with "(foo OR bar) AND
(baz OR bam)"? As far as I can tell, the general solution is to
transform the expression into disjunctive normal form, then create a
separate query for each term of the disjunction - in this case, four
queries: "foo AND baz", "foo AND bam", "bar AND baz", "bar AND bam".
Does this sound like something that might be worth pursuing? The syntax
wouldn't have to look like it does above, of course - in Googlish
syntax, AND is implicit, quotes mean THEN, a minus sign means NOT...
maybe we shouldn't bother with OR at all, since things would be much
simpler without it.
Cheers,
Michael
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<p>Arne Babenhauserheide wrote:<br>
> - Weakness: No easy (and low overhead) way to do specialized searches =
(like<br>
> regexp or metadata - like =E2=80=9Cshow me articles written by Richard=
M.<br>
> Stallman=E2=80=9D).<br>
<br>
This is something I miss when using Gnutella. Not so much metadata,<br>
since the quality of most people's metadata seems to be pretty bad, but<br>
slightly more expressive searches, such as "foo OR bar", "fo=
o THEN bar",<br>
or even "(foo THEN (bar OR baz)) AND NOT bam". Could we add somet=
hing<br>
like that to the protocol in a backwards-compatibl<wbr>e way?<br>
<br>
Imagine that we put the boolean expression in the GGEP block, for those<br>
peers that understand it. Peers that understand boolean expressions will<br=
>
use the expression to route the query; peers that don't will use the<br>
query string. How should we create the query string from the boolean<br>
expression, such that the query reaches any peer that might be able to<br>
answer it (including old peers that don't understand boolean<br>
expressions)<wbr>, and can pass through old ultrapeers that don't understan=
d<br>
boolean expressions, while keeping the search as efficient as possible?<br>
<br>
AND is easy: the query string for "foo AND bar" is "foo bar&=
quot;.<br>
<br>
Similarly, "foo THEN bar" -> "foo bar", which will c=
ollect some false<br>
positives from old peers ("bar foo"), but no false negatives.<br>
<br>
Terms with NOT can just be omitted from the query string, again<br>
producing false positives but no false negatives: "foo NOT bar" -=
><br>
"foo". Remember that new peers will look at the expression and wo=
n't<br>
bother sending responses that contain bar, so the false positives will<br>
only come from old peers.<br>
<br>
OR is the tricky one. If the boolean expression falls into two or more<br>
disjoint parts, such as "(foo AND bar) OR (baz AND bam)", then we=
need<br>
to create two separate queries, one for "foo AND bar" and another=
for<br>
"baz AND bam". But what do we do, for example, with "(foo OR=
bar) AND<br>
(baz OR bam)"? As far as I can tell, the general solution is to<br>
transform the expression into disjunctive normal form, then create a<br>
separate query for each term of the disjunction - in this case, four<br>
queries: "foo AND baz", "foo AND bam", "bar AND ba=
z", "bar AND bam".<br>
<br>
Does this sound like something that might be worth pursuing? The syntax<br>
wouldn't have to look like it does above, of course - in Googlish<br>
syntax, AND is implicit, quotes mean THEN, a minus sign means NOT...<br>
maybe we shouldn't bother with OR at all, since things would be much<br>
simpler without it.<br>
<br>
Cheers,<br>
Michael<br>
</p>
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font-weight: 700;
}
dd.last p span {
margin-right: 10px;
font-family: Verdana;
font-weight: 700;
}
dd.last p span.yshortcuts {
margin-right: 0;
}
div.attach-table div div a {
text-decoration: none;
}
div.attach-table {
width: 400px;
}
div.file-title a, div.file-title a:active, div.file-title a:hover, div.fi=
le-title a:visited {
text-decoration: none;
}
div.photo-title a, div.photo-title a:active, div.photo-title a:hover, div=
.photo-title a:visited {
text-decoration: none;
}
div#ygrp-mlmsg #ygrp-msg p a span.yshortcuts {
font-family: Verdana;
font-size: 10px;
font-weight: normal;
}
.green {
color: #628c2a;
}
.MsoNormal {
margin: 0 0 0 0;
}
o {
font-size: 0;
}
#photos div {
float: left;
width: 72px;
}
#photos div div {
border: 1px solid #666666;
height: 62px;
overflow: hidden;
width: 62px;
}
#photos div label {
color: #666666;
font-size: 10px;
overflow: hidden;
text-align: center;
white-space: nowrap;
width: 64px;
}
#reco-category {
font-size: 77%;
}
#reco-desc {
font-size: 77%;
}
.replbq {
margin: 4px;
}
#ygrp-actbar div a:first-child {
/* border-right: 0px solid #000;*/
margin-right: 2px;
padding-right: 5px;
}
#ygrp-mlmsg {
font-size: 13px;
font-family: Arial, helvetica,clean, sans-serif;
*font-size: small;
*font: x-small;
}
#ygrp-mlmsg table {
font-size: inherit;
font: 100%;
}
#ygrp-mlmsg select, input, textarea {
font: 99% Arial, Helvetica, clean, sans-serif;
}
#ygrp-mlmsg pre, code {
font:115% monospace;
*font-size:100%;
}
#ygrp-mlmsg * {
line-height: 1.22em;
}
#ygrp-mlmsg #logo {
padding-bottom: 10px;
}
#ygrp-mlmsg a {
color: #1E66AE;
}
#ygrp-msg p a {
font-family: Verdana;
}
#ygrp-msg p#attach-count span {
color: #1E66AE;
font-weight: 700;
}
#ygrp-reco #reco-head {
color: #ff7900;
font-weight: 700;
}
#ygrp-reco {
margin-bottom: 20px;
padding: 0px;
}
#ygrp-sponsor #ov li a {
font-size: 130%;
text-decoration: none;
}
#ygrp-sponsor #ov li {
font-size: 77%;
list-style-type: square;
padding: 6px 0;
}=20
#ygrp-sponsor #ov ul {
margin: 0;
padding: 0 0 0 8px;
}
#ygrp-text {
font-family: Georgia;
}
#ygrp-text p {
margin: 0 0 1em 0;
}
#ygrp-text tt {
font-size: 120%;
}
#ygrp-vital ul li:last-child {
border-right: none !important;=20
}=20
-->
</style>
</head>
<!--~-|**|PrettyHtmlEnd|**|-~-->
</html>
<!-- end group email -->
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