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https://issues.apache.org/jira/browse/ANY23-504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17428460#comment-17428460
]
Sebastian Nagel commented on ANY23-504:
---------------------------------------
Hi [~lewismc], thanks so far. In case it helps - I've tried to narrow the
problem down and found it's reproducible with Nutch (using NUTCH-2892) by
{noformat}
strace -f bin/nutch parsechecker -Dparser.timeout=120
-Dany23.extractors=rdf-xml -Dplugin.includes='protocol-file|parse-html|any23'
file:/path/to/BBC_News_Scotland.html
{noformat}
"strace -f" logs all system calls of the process and its children. The log
output includes the following lines which show that a DNS lookup for
"www.w3.org" happened and a connection is opened to the resulting IP address
"128.30.52.100":
{noformat}
[pid 284098] socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, IPPROTO_IP)
= 363
[pid 284098] setsockopt(363, SOL_IP, IP_RECVERR, [1], 4) = 0
[pid 284098] connect(363, {sa_family=AF_INET, sin_port=htons(53),
sin_addr=inet_addr("127.0.0.53")}, 16) = 0
[pid 284098] poll([{fd=363, events=POLLOUT}], 1, 0) = 1 ([{fd=363,
revents=POLLOUT}])
[pid 284098] sendmmsg(363, [{msg_hdr={msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="71\1 \0\1\0\0\0\0\0\1\3www\2w3\3org\0\0\1\0\1\0\0)\4"...,
iov_len=39}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, msg_len=39},
{msg_hdr={msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\0036\1
\0\1\0\0\0\0\0\1\3www\2w3\3org\0\0\34\0\1\0\0)\4"..., iov_len=39}],
msg_iovlen=1, msg_controllen=0, msg_flags=0}, msg_len=39}], 2, MSG_NOSIGNAL) = 2
[pid 284098] poll([{fd=363, events=POLLIN}], 1, 5000) = 1 ([{fd=363,
revents=POLLIN}])
[pid 284098] ioctl(363, FIONREAD, [55]) = 0
[pid 284098] recvfrom(363,
"71\201\200\0\1\0\1\0\0\0\1\3www\2w3\3org\0\0\1\0\1\300\f\0\1"..., 2048, 0,
{sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("127.0.0.53")},
[28->16]) = 55
[pid 284098] poll([{fd=363, events=POLLIN}], 1, 4999 <unfinished ...>
[pid 284098] <... poll resumed>) = 1 ([{fd=363, revents=POLLIN}])
[pid 284098] ioctl(363, FIONREAD, [39]) = 0
[pid 284098] recvfrom(363,
"\0036\201\200\0\1\0\0\0\0\0\1\3www\2w3\3org\0\0\34\0\1\0\0)\377"..., 65536, 0,
{sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("127.0.0.53")},
[28->16]) = 39
[pid 284098] close(363) = 0
[pid 284098] socket(AF_INET6, SOCK_STREAM, IPPROTO_IP) = 363
[pid 284098] setsockopt(363, SOL_IPV6, IPV6_V6ONLY, [0], 4) = 0
[pid 284098] connect(363, {sa_family=AF_INET6, sin6_port=htons(80),
sin6_flowinfo=htonl(0), inet_pton(AF_INET6, "::ffff:128.30.52.100",
&sin6_addr), sin6_scope_id=0}, 28 <unfinished ...>
{noformat}
This way you can reproduce the issue even if there is no hanging connection
which was somehow bad luck. Or good luck?
There are more hints in the strace log:
{noformat}
[pid 284098] sendto(363, "GET /MarkUp/DTD/xhtml-rdfa-1.dtd"..., 175, 0, NULL,
0) = 175
{noformat}
So, it's obviously the DTD in the first line
{code:xml}
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML+RDFa 1.0//EN"
"http://www.w3.org/MarkUp/DTD/xhtml-rdfa-1.dtd";>
{code}
There's also an error message (looks like it does not make it to stderr or in
any log file):
{noformat}
[pid 284133] write(2, "[Fatal Error] :1:104: External D"..., 179[Fatal Error]
:1:104: External DTD: Failed to read external DTD 'xhtml-rdfa-1.dtd', because
'http' access is not allowed due to restriction set by the accessExternalDTD
property.
<unfinished ...>
{noformat}
Hope this helps. Thanks!
> Optionally disable remote HTTP connections when resolving XML entities
> ----------------------------------------------------------------------
>
> Key: ANY23-504
> URL: https://issues.apache.org/jira/browse/ANY23-504
> Project: Apache Any23
> Issue Type: Improvement
> Reporter: Sebastian Nagel
> Assignee: Lewis John McGibbney
> Priority: Major
> Fix For: 2.6
>
>
> The Any23 parser should optionally avoid to open HTTP connections when
> parsing XML.
> While testing the Nutch's Any23 plugin with 2.5 (NUTCH-2892) on the file
> "BBC_News_Scotland.htm", the parser did hang for about two minutes with an
> open HTTP connection to "hans-moleman.w3.org" and the following stack:
> {noformat}
> "parse-0" #19 daemon prio=5 os_prio=0 cpu=1432.93ms elapsed=15.85s
> tid=0x00007efc713bd800 nid=0x16ff4 runnable [0x00007efc29f2d000]
> java.lang.Thread.State: RUNNABLE
> at java.net.SocketInputStream.socketRead0([email protected]/Native
> Method)
> at
> java.net.SocketInputStream.socketRead([email protected]/SocketInputStream.java:115)
> at
> java.net.SocketInputStream.read([email protected]/SocketInputStream.java:168)
> at
> java.net.SocketInputStream.read([email protected]/SocketInputStream.java:140)
> at
> java.io.BufferedInputStream.fill([email protected]/BufferedInputStream.java:252)
> at
> java.io.BufferedInputStream.read1([email protected]/BufferedInputStream.java:292)
> at
> java.io.BufferedInputStream.read([email protected]/BufferedInputStream.java:351)
> - locked <0x000000071be1bb68> (a java.io.BufferedInputStream)
> at
> sun.net.www.http.HttpClient.parseHTTPHeader([email protected]/HttpClient.java:754)
> at
> sun.net.www.http.HttpClient.parseHTTP([email protected]/HttpClient.java:689)
> at
> sun.net.www.protocol.http.HttpURLConnection.getInputStream0([email protected]/HttpURLConnection.java:1615)
> - locked <0x000000071be11040> (a
> sun.net.www.protocol.http.HttpURLConnection)
> at
> sun.net.www.protocol.http.HttpURLConnection.getInputStream([email protected]/HttpURLConnection.java:1520)
> - locked <0x000000071be11040> (a
> sun.net.www.protocol.http.HttpURLConnection)
> at org.apache.xerces.impl.XMLEntityManager.setupCurrentEntity(Unknown
> Source)
> at org.apache.xerces.impl.XMLEntityManager.startEntity(Unknown Source)
> at org.apache.xerces.impl.XMLEntityManager.startDTDEntity(Unknown
> Source)
> at org.apache.xerces.impl.XMLDTDScannerImpl.setInputSource(Unknown
> Source)
> at
> org.apache.xerces.impl.XMLDocumentScannerImpl$DTDDispatcher.dispatch(Unknown
> Source)
> at
> org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
> Source)
> at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
> at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
> at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
> at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
> at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown
> Source)
> at
> org.eclipse.rdf4j.common.xml.SimpleSAXParser.parse(SimpleSAXParser.java:197)
> - locked <0x000000071bfe6f28> (a
> org.eclipse.rdf4j.common.xml.SimpleSAXParser)
> at org.eclipse.rdf4j.rio.trix.TriXParser.parse(TriXParser.java:177)
> at org.eclipse.rdf4j.rio.trix.TriXParser.parse(TriXParser.java:134)
> at
> org.apache.any23.extractor.rdf.BaseRDFExtractor.run(BaseRDFExtractor.java:86)
> at
> org.apache.any23.extractor.rdf.BaseRDFExtractor.run(BaseRDFExtractor.java:39)
> at
> org.apache.any23.extractor.SingleDocumentExtraction.runExtractor(SingleDocumentExtraction.java:523)
> at
> org.apache.any23.extractor.SingleDocumentExtraction.run(SingleDocumentExtraction.java:265)
> at org.apache.any23.Any23.extract(Any23.java:315)
> at org.apache.any23.Any23.extract(Any23.java:483)
> at org.apache.any23.Any23.extract(Any23.java:345)
> at
> org.apache.nutch.any23.Any23ParseFilter$Any23Parser.parse(Any23ParseFilter.java:106)
> at
> org.apache.nutch.any23.Any23ParseFilter$Any23Parser.<init>(Any23ParseFilter.java:81)
> at
> org.apache.nutch.any23.Any23ParseFilter.filter(Any23ParseFilter.java:153)
> at
> org.apache.nutch.parse.HtmlParseFilters.filter(HtmlParseFilters.java:55)
> at
> org.apache.nutch.parse.html.HtmlParser.getParse(HtmlParser.java:257)
> at org.apache.nutch.parse.ParseCallable.call(ParseCallable.java:34)
> at org.apache.nutch.parse.ParseCallable.call(ParseCallable.java:23)
> at
> java.util.concurrent.FutureTask.run([email protected]/FutureTask.java:264)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker([email protected]/ThreadPoolExecutor.java:1128)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run([email protected]/ThreadPoolExecutor.java:628)
> at java.lang.Thread.run([email protected]/Thread.java:829)
> {noformat}
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