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Skip cdx dedup for volatile URLs with session params

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A lot of cdx dedup requests fail. Checking production logs, we see that
we try to dedup URLs that are certainly volative and session-specific.
We can skip them to reduce cdx dedup load. We won't find any matches
anyway since they contain session-specific vars.

We suggest to skip cdx dedup for URL that include `JSESSIONID=`,
`session=` or `sess=`. These are common session URL params, there could
be many-many more.

Example URLs:
```
/session/683/urii8zej/xhr_streaming?JSESSIONID=dv0jkbk2-8xm9t9tf-7wp8lx0m-x4vb22ys

https://tw.popin.cc/popin_discovery/recommend?mode=new&url=https%3A%2F%2Fwww.nownews.com%2Fcat%2Fpolitics%2Fmilitary%2F&&device=pc&media=www.nownews.com&extra=other&agency=cnplus&topn=100&ad=100&r_category=all&country=tw&redirect=false&infinite=nownews&infinite_domain=m.nownews.com&piuid=43757d2474f09288b8410a9f2a40acf1&info=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&session=13927861b5403&callback=_p6_8e102dd0c975

http://c.statcounter.com/text.php?sc_project=4092884&java=1&security=10fe3b6b&u1=915B47A927524F10185B2F074074BDCB&sc_random=0.017686960888044556&jg=310&rr=1.1.1.1.1.1.1.1.1&resolution=1600&h=1000&camefrom=&u=http%3A//buchlatech.blogspot.com/search/label/prototype&t=Buchla%20Tech%3A%20prototype&rcat=d&rdomo=d&rdomg=310&bb=0&sc_snum=1&sess=cfa820&p=0&text=2
```
This commit is contained in:
Vangelis Banos 2019-09-20 06:31:15 +00:00
parent 88a7f79a7e
commit 8f20fc014e
1 changed files with 5 additions and 0 deletions
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5
warcprox/dedup.py
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@ -266,6 +266,9 @@ class CdxServerDedup(DedupDb):
performance optimisation to handle that. limit < 0 is very inefficient
in general. Maybe it could be configurable in the future.
Skip dedup for URLs with session params. These URLs are certainly
unique and highly volatile, we cannot dedup them.
:param digest_key: b'sha1:<KEY-VALUE>' (prefix is optional).
Example: b'sha1:B2LTWWPUOYAH7UIPQ7ZUPQ4VMBSVC36A'
:param url: Target URL string
@ -274,6 +277,8 @@ class CdxServerDedup(DedupDb):
"""
u = url.decode("utf-8") if isinstance(url, bytes) else url
try:
if any(s in u for s in ('JSESSIONID=', 'session=', 'sess=')):
return None
result = self.http_pool.request('GET', self.cdx_url, fields=dict(
url=u, fl="timestamp,digest", filter="!mimetype:warc/revisit",
limit=-1))