All Known Implementing Classes:

CaseInsensitiveMetadata, Metadata, SpellCheckedMetadata
```
public interface Nutch
```
A collection of Nutch internal metadata constants.

Author:

Chris Mattmann, Jérôme Charron

Field Summary

Fields
Modifier and Type	Field	Description
`static String`	`ARG_CRAWLDB`	Argument key to specify the location of crawldb for the REST endpoints
`static String`	`ARG_HOSTDB`	Argument key to specify the location of hostdb for the REST endpoints
`static String`	`ARG_LINKDB`	Argument key to specify the location of linkdb for the REST endpoints
`static String`	`ARG_SEEDDIR`	Argument key to specify location of the seed url dir for the REST endpoints
`static String`	`ARG_SEEDNAME`	Argument key to specify name of a seed list for the REST endpoints
`static String`	`ARG_SEGMENTDIR`	Argument key to specify the location of a directory of segments for the REST endpoints.
`static String`	`ARG_SEGMENTS`	Argument key to specify the location of individual segment or list of segments for the REST endpoints.
`static String`	`CACHING_FORBIDDEN_ALL`	Don't show either original forbidden content or summaries.
`static String`	`CACHING_FORBIDDEN_CONTENT`	Don't show original forbidden content, but show summaries.
`static String`	`CACHING_FORBIDDEN_KEY`	Sites may request that search engines don't provide access to cached documents.
`static String`	`CACHING_FORBIDDEN_NONE`	Show both original forbidden content and summaries (default).
`static String`	`CHAR_ENCODING_FOR_CONVERSION`
`static String`	`CRAWL_ID_KEY`	Used by Nutch REST service
`static String`	`FETCH_EVENT_CONTENTLANG`	Content-lanueage key in the Pub/Sub event metadata for the content-language of the parsed page
`static String`	`FETCH_EVENT_CONTENTTYPE`	Content-type key in the Pub/Sub event metadata for the content-type of the parsed page
`static String`	`FETCH_EVENT_FETCHTIME`	Fetch time key in the Pub/Sub event metadata for the fetch time of the parsed page
`static String`	`FETCH_EVENT_SCORE`	Score key in the Pub/Sub event metadata for the score of the parsed page
`static String`	`FETCH_EVENT_TITLE`	Title key in the Pub/Sub event metadata for the title of the parsed page
`static String`	`FETCH_STATUS_KEY`
`static String`	`FETCH_TIME_KEY`
`static String`	`FIXED_INTERVAL_KEY`	Used by AdaptiveFetchSchedule to maintain custom fetch interval
`static String`	`GENERATE_TIME_KEY`
`static String`	`ORIGINAL_CHAR_ENCODING`
`static String`	`PROTO_STATUS_KEY`
`static Text`	`PROTOCOL_STATUS_CODE_KEY`
`static String`	`REPR_URL_KEY`
`static String`	`ROBOTS_METATAG`	Name to store the robots metatag in `ParseData`'s metadata.
`static String`	`SCORE_KEY`
`static String`	`SEGMENT_NAME_KEY`
`static String`	`SIGNATURE_KEY`
`static String`	`STAT_PROGRESS`	For progress of job.
`static String`	`VAL_RESULT`	Name of the key used in the Result Map sent back by the REST endpoint
`static Text`	`WRITABLE_FIXED_INTERVAL_KEY`
`static Text`	`WRITABLE_GENERATE_TIME_KEY`
`static Text`	`WRITABLE_PROTO_STATUS_KEY`
`static Text`	`WRITABLE_REPR_URL_KEY`

- Field Detail
  - ORIGINAL_CHAR_ENCODING
```
static final String ORIGINAL_CHAR_ENCODING
```
    See Also:
    
    Constant Field Values
  - CHAR_ENCODING_FOR_CONVERSION
```
static final String CHAR_ENCODING_FOR_CONVERSION
```
    See Also:
    
    Constant Field Values
  - SIGNATURE_KEY
```
static final String SIGNATURE_KEY
```
    See Also:
    
    Constant Field Values
  - SEGMENT_NAME_KEY
```
static final String SEGMENT_NAME_KEY
```
    See Also:
    
    Constant Field Values
  - SCORE_KEY
```
static final String SCORE_KEY
```
    See Also:
    
    Constant Field Values
  - GENERATE_TIME_KEY
```
static final String GENERATE_TIME_KEY
```
    See Also:
    
    Constant Field Values
  - WRITABLE_GENERATE_TIME_KEY
```
static final Text WRITABLE_GENERATE_TIME_KEY
```
  - PROTOCOL_STATUS_CODE_KEY
```
static final Text PROTOCOL_STATUS_CODE_KEY
```
  - PROTO_STATUS_KEY
```
static final String PROTO_STATUS_KEY
```
    See Also:
    
    Constant Field Values
  - WRITABLE_PROTO_STATUS_KEY
```
static final Text WRITABLE_PROTO_STATUS_KEY
```
  - FETCH_TIME_KEY
```
static final String FETCH_TIME_KEY
```
    See Also:
    
    Constant Field Values
  - FETCH_STATUS_KEY
```
static final String FETCH_STATUS_KEY
```
    See Also:
    
    Constant Field Values
  - ROBOTS_METATAG
```
static final String ROBOTS_METATAG
```
    Name to store the robots metatag in ParseData's metadata.
    
    See Also:
    
    Constant Field Values
  - CACHING_FORBIDDEN_KEY
```
static final String CACHING_FORBIDDEN_KEY
```
    Sites may request that search engines don't provide access to cached documents.
    
    See Also:
    
    Constant Field Values
  - CACHING_FORBIDDEN_NONE
```
static final String CACHING_FORBIDDEN_NONE
```
    Show both original forbidden content and summaries (default).
    
    See Also:
    
    Constant Field Values
  - CACHING_FORBIDDEN_ALL
```
static final String CACHING_FORBIDDEN_ALL
```
    Don't show either original forbidden content or summaries.
    
    See Also:
    
    Constant Field Values
  - CACHING_FORBIDDEN_CONTENT
```
static final String CACHING_FORBIDDEN_CONTENT
```
    Don't show original forbidden content, but show summaries.
    
    See Also:
    
    Constant Field Values
  - REPR_URL_KEY
```
static final String REPR_URL_KEY
```
    See Also:
    
    Constant Field Values
  - WRITABLE_REPR_URL_KEY
```
static final Text WRITABLE_REPR_URL_KEY
```
  - FIXED_INTERVAL_KEY
```
static final String FIXED_INTERVAL_KEY
```
    Used by AdaptiveFetchSchedule to maintain custom fetch interval
    
    See Also:
    
    Constant Field Values
  - WRITABLE_FIXED_INTERVAL_KEY
```
static final Text WRITABLE_FIXED_INTERVAL_KEY
```
  - STAT_PROGRESS
```
static final String STAT_PROGRESS
```
    For progress of job. Used by the Nutch REST service
    
    See Also:
    
    Constant Field Values
  - CRAWL_ID_KEY
```
static final String CRAWL_ID_KEY
```
    Used by Nutch REST service
    
    See Also:
    
    Constant Field Values
  - ARG_SEEDDIR
```
static final String ARG_SEEDDIR
```
    Argument key to specify location of the seed url dir for the REST endpoints
    
    See Also:
    
    Constant Field Values
  - ARG_SEEDNAME
```
static final String ARG_SEEDNAME
```
    Argument key to specify name of a seed list for the REST endpoints
    
    See Also:
    
    Constant Field Values
  - ARG_CRAWLDB
```
static final String ARG_CRAWLDB
```
    Argument key to specify the location of crawldb for the REST endpoints
    
    See Also:
    
    Constant Field Values
  - ARG_LINKDB
```
static final String ARG_LINKDB
```
    Argument key to specify the location of linkdb for the REST endpoints
    
    See Also:
    
    Constant Field Values
  - VAL_RESULT
```
static final String VAL_RESULT
```
    Name of the key used in the Result Map sent back by the REST endpoint
    
    See Also:
    
    Constant Field Values
  - ARG_SEGMENTDIR
```
static final String ARG_SEGMENTDIR
```
    Argument key to specify the location of a directory of segments for the REST endpoints. Similar to the -dir command in the bin/nutch script
    
    See Also:
    
    Constant Field Values
  - ARG_SEGMENTS
```
static final String ARG_SEGMENTS
```
    Argument key to specify the location of individual segment or list of segments for the REST endpoints. The behavior differs for diffirent endpoints: CrawlDb, LinkDb and Indexing Jobs take list of segments, Fetcher and Parse segment take one segment
    
    See Also:
    
    Constant Field Values
  - ARG_HOSTDB
```
static final String ARG_HOSTDB
```
    Argument key to specify the location of hostdb for the REST endpoints
    
    See Also:
    
    Constant Field Values
  - FETCH_EVENT_TITLE
```
static final String FETCH_EVENT_TITLE
```
    Title key in the Pub/Sub event metadata for the title of the parsed page
    
    See Also:
    
    Constant Field Values
  - FETCH_EVENT_CONTENTTYPE
```
static final String FETCH_EVENT_CONTENTTYPE
```
    Content-type key in the Pub/Sub event metadata for the content-type of the parsed page
    
    See Also:
    
    Constant Field Values
  - FETCH_EVENT_SCORE
```
static final String FETCH_EVENT_SCORE
```
    Score key in the Pub/Sub event metadata for the score of the parsed page
    
    See Also:
    
    Constant Field Values
  - FETCH_EVENT_FETCHTIME
```
static final String FETCH_EVENT_FETCHTIME
```
    Fetch time key in the Pub/Sub event metadata for the fetch time of the parsed page
    
    See Also:
    
    Constant Field Values
  - FETCH_EVENT_CONTENTLANG
```
static final String FETCH_EVENT_CONTENTLANG
```
    Content-lanueage key in the Pub/Sub event metadata for the content-language of the parsed page
    
    See Also:
    
    Constant Field Values

Interface Nutch

Field Summary

Field Detail

ORIGINAL_CHAR_ENCODING

CHAR_ENCODING_FOR_CONVERSION

SIGNATURE_KEY

SEGMENT_NAME_KEY

SCORE_KEY

GENERATE_TIME_KEY

WRITABLE_GENERATE_TIME_KEY

PROTOCOL_STATUS_CODE_KEY

PROTO_STATUS_KEY

WRITABLE_PROTO_STATUS_KEY

FETCH_TIME_KEY

FETCH_STATUS_KEY

ROBOTS_METATAG

CACHING_FORBIDDEN_KEY

CACHING_FORBIDDEN_NONE

CACHING_FORBIDDEN_ALL

CACHING_FORBIDDEN_CONTENT

REPR_URL_KEY

WRITABLE_REPR_URL_KEY

FIXED_INTERVAL_KEY

WRITABLE_FIXED_INTERVAL_KEY

STAT_PROGRESS

CRAWL_ID_KEY

ARG_SEEDDIR

ARG_SEEDNAME

ARG_CRAWLDB

ARG_LINKDB

VAL_RESULT

ARG_SEGMENTDIR

ARG_SEGMENTS

ARG_HOSTDB

FETCH_EVENT_TITLE

FETCH_EVENT_CONTENTTYPE

FETCH_EVENT_SCORE

FETCH_EVENT_FETCHTIME

FETCH_EVENT_CONTENTLANG