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https://issues.apache.org/jira/browse/NUTCH-2391?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sebastian Nagel updated NUTCH-2391:
-----------------------------------
Description:
We're seeing some incidence of a large number of documents being marked as
duplicate in our crawl.
We traced it back to one of the crawl plugins returning an empty array for the
content field.
We'd like to propose changing the MD5 signature generation from:
{code}
public byte[] calculate(Content content, Parse parse) {
byte[] data = content.getContent();
if (data == null)
data = content.getUrl().getBytes();
return MD5Hash.digest(data).getDigest();
}
{code}
to:
{code}
public byte[] calculate(Content content, Parse parse) {
byte[] data = content.getContent();
if ((data == null) || (data.length == 0))
data = content.getUrl().getBytes();
return MD5Hash.digest(data).getDigest();
}
{code}
to address the issue
was:
We're seeing some incidence of a large number of documents being marked as
duplicate in our crawl.
We traced it back to one of the crawl plugins returning an empty array for the
content field.
We'd like to propose changing the MD5 signature generation from:
public byte[] calculate(Content content, Parse parse) {
byte[] data = content.getContent();
if (data == null)
data = content.getUrl().getBytes();
return MD5Hash.digest(data).getDigest();
}
to:
public byte[] calculate(Content content, Parse parse) {
byte[] data = content.getContent();
if ((data == null) || (data.length == 0))
data = content.getUrl().getBytes();
return MD5Hash.digest(data).getDigest();
}
to address the issue
> Spurious Duplications for MD5
> -----------------------------
>
> Key: NUTCH-2391
> URL: https://issues.apache.org/jira/browse/NUTCH-2391
> Project: Nutch
> Issue Type: Bug
> Components: commoncrawl
> Affects Versions: 1.11
> Reporter: David Johnson
> Priority: Minor
> Fix For: 1.14
>
>
> We're seeing some incidence of a large number of documents being marked as
> duplicate in our crawl.
> We traced it back to one of the crawl plugins returning an empty array for
> the content field.
> We'd like to propose changing the MD5 signature generation from:
> {code}
> public byte[] calculate(Content content, Parse parse) {
> byte[] data = content.getContent();
> if (data == null)
> data = content.getUrl().getBytes();
> return MD5Hash.digest(data).getDigest();
> }
> {code}
> to:
> {code}
> public byte[] calculate(Content content, Parse parse) {
> byte[] data = content.getContent();
> if ((data == null) || (data.length == 0))
> data = content.getUrl().getBytes();
> return MD5Hash.digest(data).getDigest();
> }
> {code}
> to address the issue
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