1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
#!/usr/bin/env python3
"""
Streaming Hadoop script to import CDX metadata into the HBase fulltext table,
primarily for URL-agnostic crawl de-duplication. Takes only "fulltext" file
formats.
Requires:
- happybase
- mrjob
TODO:
- argparse
- refactor into an object
- tests in separate file
- nose tests
- sentry integration for error reporting
"""
import sys
import json
from datetime import datetime
import happybase
import mrjob
from mrjob.job import MRJob
NORMAL_MIME = (
'application/pdf',
'application/postscript',
'text/html',
'text/xml',
)
def normalize_mime(raw):
raw = raw.lower()
for norm in NORMAL_MIME:
if raw.startswith(norm):
return norm
# Special cases
if raw.startswith('application/xml'):
return 'text/xml'
if raw.startswith('application/x-pdf'):
return 'application/pdf'
return None
def test_normalize_mime():
assert normalize_mime("asdf") == None
assert normalize_mime("application/pdf") == "application/pdf"
assert normalize_mime("application/pdf+journal") == "application/pdf"
assert normalize_mime("Application/PDF") == "application/pdf"
assert normalize_mime("application/p") == None
assert normalize_mime("application/xml+stuff") == "text/xml"
def transform_line(raw_cdx):
cdx = raw_cdx.split()
if len(cdx) < 11:
return None
surt = cdx[0]
dt = cdx[1]
url = cdx[2]
mime = normalize_mime(cdx[3])
http_status = cdx[4]
key = cdx[5]
c_size = cdx[8]
offset = cdx[9]
warc = cdx[10]
if not (key.isalnum() and c_size.isdigit() and offset.isdigit()
and http_status == "200" and len(key) == 32 and dt.isdigit()):
return None
if '-' in (surt, dt, url, mime, http_status, key, c_size, offset, warc):
return None
info = dict(surt=surt, dt=dt, url=url, c_size=c_size, offset=offset,
warc=warc)
warc_file = warc.split('/')[-1]
dt_iso = datetime.strptime(dt, "%Y%m%d%H%M%S").isoformat()
try:
dt_iso = datetime.strptime(dt, "%Y%m%d%H%M%S").isoformat()
except:
return None
# 'i' intentionally not set
heritrix = dict(u=url, d=dt_iso, f=warc_file, o=offset, c="1")
return {'key': key, 'file:mime': mime, 'file:cdx': info, 'f:c': heritrix}
def test_transform_line():
raw = "edu,upenn,ldc)/sites/www.ldc.upenn.edu/files/medar2009-large-arabic-broadcast-collection.pdf 20170828233154 https://www.ldc.upenn.edu/sites/www.ldc.upenn.edu/files/medar2009-large-arabic-broadcast-collection.pdf application/pdf 200 WL3FEA62TEU4F52Y5DOVQ62VET4QJW7G - - 210251 931661233 SEMSCHOLAR-PDF-CRAWL-2017-08-04-20170828231135742-00000-00009-wbgrp-svc284/SEMSCHOLAR-PDF-CRAWL-2017-08-04-20170828232253025-00005-3480~wbgrp-svc284.us.archive.org~8443.warc.gz"
correct = {
'key': "WL3FEA62TEU4F52Y5DOVQ62VET4QJW7G",
'file:mime': "application/pdf",
'file:cdx': {
'surt': "edu,upenn,ldc)/sites/www.ldc.upenn.edu/files/medar2009-large-arabic-broadcast-collection.pdf",
'url': "https://www.ldc.upenn.edu/sites/www.ldc.upenn.edu/files/medar2009-large-arabic-broadcast-collection.pdf",
'dt': "20170828233154",
'warc': "SEMSCHOLAR-PDF-CRAWL-2017-08-04-20170828231135742-00000-00009-wbgrp-svc284/SEMSCHOLAR-PDF-CRAWL-2017-08-04-20170828232253025-00005-3480~wbgrp-svc284.us.archive.org~8443.warc.gz",
'offset': "931661233",
'c_size': "210251",
},
'f:c': {
'u': "https://www.ldc.upenn.edu/sites/www.ldc.upenn.edu/files/medar2009-large-arabic-broadcast-collection.pdf",
'd': "2017-08-28T23:31:54",
'f': "SEMSCHOLAR-PDF-CRAWL-2017-08-04-20170828232253025-00005-3480~wbgrp-svc284.us.archive.org~8443.warc.gz",
'o': "931661233",
'c': "1",
}
}
assert transform_line(raw) == correct
assert transform_line(raw + "\n") == correct
assert transform_line(raw + " extra_field") == correct
class MRCDXBackfillHBase(MRJob):
# CDX lines in
INPUT_PROTOCOL = mrjob.protocol.RawValueProtocol
OUTPUT_PROTOCOL = mrjob.protocol.JSONValueProtocol
def configure_args(self):
super(MRCDXBackfillHBase, self).configure_args()
self.add_passthru_arg('--hbase-table',
type=str,
default='wbgrp-journal-extract-0-qa',
help='HBase table to backfill into (must exist)')
self.add_passthru_arg('--hbase-host',
type=str,
default='localhost',
help='HBase thrift API host to connect to')
def __init__(self, *args, **kwargs):
# Allow passthrough for tests
if 'hb_table' in kwargs:
self.hb_table = kwargs.pop('hb_table')
else:
self.hb_table = None
super(MRCDXBackfillHBase, self).__init__(*args, **kwargs)
self.mime_filter = ['application/pdf']
def mapper_init(self):
if self.hb_table is None:
try:
host = self.options.hbase_host
hb_conn = happybase.Connection(host=host)
except Exception as err:
raise Exception("Couldn't connect to HBase using host: {}".format(host))
self.hb_table = hb_conn.table(self.options.hbase_table)
def mapper(self, _, raw_cdx):
self.increment_counter('lines', 'total')
if (raw_cdx.startswith(' ') or raw_cdx.startswith('filedesc') or
raw_cdx.startswith('#')):
# Skip line
self.increment_counter('lines', 'invalid')
return _, status
info = transform_line(raw_cdx)
if info is None:
self.increment_counter('lines', 'invalid')
return
if info['file:mime'] not in self.mime_filter:
self.increment_counter('lines', 'skip')
return
key = info.pop('key')
info['f:c'] = json.dumps(info['f:c'], sort_keys=True, indent=None)
info['file:cdx'] = json.dumps(info['file:cdx'], sort_keys=True,
indent=None)
self.hb_table.put(key, info)
self.increment_counter('lines', 'success')
yield _, dict(status="success")
if __name__ == '__main__':
MRCDXBackfillHBase.run()
|
