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https://issues.apache.org/jira/browse/NUTCH-2517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16388650#comment-16388650
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Lewis John McGibbney edited comment on NUTCH-2517 at 3/6/18 10:49 PM:
----------------------------------------------------------------------
I cannot reproduce this... see below for tests
{code}
//inject
/usr/local/nutch(master) $ ./runtime/local/bin/nutch inject mycrawl/crawldb
urls/seed.txt
Injector: starting at 2018-03-06 14:31:10
Injector: crawlDb: mycrawl/crawldb
Injector: urlDir: urls/seed.txt
Injector: Converting injected urls to crawl db entries.
Injector: overwrite: false
Injector: update: false
Injector: Total urls rejected by filters: 0
Injector: Total urls injected after normalization and filtering: 1
Injector: Total urls injected but already in CrawlDb: 0
Injector: Total new urls injected: 1
Injector: finished at 2018-03-06 14:31:12, elapsed: 00:00:01
{code}
{code}
//simple 'ls' to see what we have
/usr/local/nutch(master) $ ls mycrawl/crawldb/
current/ old/
{code}
{code}
// generate
/usr/local/nutch(master) $ ./runtime/local/bin/nutch generate mycrawl/crawldb
mycrawl/segments 1
Generator: starting at 2018-03-06 14:31:37
Generator: Selecting best-scoring urls due for fetch.
Generator: filtering: true
Generator: normalizing: true
Generator: running in local mode, generating exactly one partition.
Generator: Partitioning selected urls for politeness.
Generator: segment: mycrawl/segments/20180306143139
Generator: finished at 2018-03-06 14:31:40, elapsed: 00:00:03
{code}
{code}
//fetch
/usr/local/nutch(master) $ ./runtime/local/bin/nutch fetch
mycrawl/segments/20180306143139 -threads 2
Fetcher: starting at 2018-03-06 14:32:15
Fetcher: segment: mycrawl/segments/20180306143139
Fetcher: threads: 2
Fetcher: time-out divisor: 2
QueueFeeder finished: total 1 records hit by time limit :0
FetcherThread 36 Using queue mode : byHost
FetcherThread 36 Using queue mode : byHost
FetcherThread 40 fetching http://nutch.apache.org:-1/ (queue crawl delay=5000ms)
Fetcher: throughput threshold: -1
Fetcher: throughput threshold retries: 5
FetcherThread 41 has no more work available
FetcherThread 41 -finishing thread FetcherThread, activeThreads=1
robots.txt whitelist not configured.
FetcherThread 40 has no more work available
FetcherThread 40 -finishing thread FetcherThread, activeThreads=0
-activeThreads=0, spinWaiting=0, fetchQueues.totalSize=0,
fetchQueues.getQueueCount=0
-activeThreads=0
Fetcher: finished at 2018-03-06 14:32:18, elapsed: 00:00:02
{code}
{code}
//parse
/usr/local/nutch(master) $ ./runtime/local/bin/nutch parse
mycrawl/segments/20180306143139 -threads 2
ParseSegment: starting at 2018-03-06 14:32:45
ParseSegment: segment: mycrawl/segments/20180306143139
Parsed (140ms):http://nutch.apache.org:-1/
ParseSegment: finished at 2018-03-06 14:32:46, elapsed: 00:00:01
{code}
{code}
// lets see what we have
/usr/local/nutch(master) $ ls mycrawl/
crawldb/ segments/
/usr/local/nutch(master) $ ls mycrawl/segments/20180306143139/
content/ crawl_fetch/ crawl_generate/ crawl_parse/ parse_data/
parse_text/
{code}
{code}
//updatedb
/usr/local/nutch(master) $ ./runtime/local/bin/nutch updatedb mycrawl/crawldb
mycrawl/segments/20180306143139/
CrawlDb update: starting at 2018-03-06 14:33:40
CrawlDb update: db: mycrawl/crawldb
CrawlDb update: segments: [mycrawl/segments/20180306143139]
CrawlDb update: additions allowed: true
CrawlDb update: URL normalizing: false
CrawlDb update: URL filtering: false
CrawlDb update: 404 purging: false
CrawlDb update: Merging segment data into db.
CrawlDb update: finished at 2018-03-06 14:33:41, elapsed: 00:00:01
{code}
{code}
//lets see what we have
/usr/local/nutch(master) $ ls mycrawl/
crawldb/ segments/
{code}
//mergesegs with -dir option
/usr/local/nutch(master) $ ./runtime/local/bin/nutch mergesegs
mycrawl/MERGEDsegments -dir mycrawl/segments/ -filter
Merging 1 segments to mycrawl/MERGEDsegments/20180306143518
SegmentMerger: adding file:/usr/local/nutch/mycrawl/segments/20180306143139
SegmentMerger: using segment data from: content crawl_generate crawl_fetch
crawl_parse parse_data parse_text
{code}
{code}
// lets see what we have
/usr/local/nutch(master) $ ls mycrawl/
MERGEDsegments/ crawldb/ segments/
/usr/local/nutch(master) $ ls mycrawl/MERGEDsegments/20180306143518/crawl_
crawl_generate/ crawl_parse/
{code}
{code}
//mergesegs with single segment directory without dir option
/usr/local/nutch(master) $ ./runtime/local/bin/nutch mergesegs
mycrawl/MERGEDsegments2 mycrawl/segments/20180306143139/ -filter
Merging 1 segments to mycrawl/MERGEDsegments2/20180306143617
SegmentMerger: adding mycrawl/segments/20180306143139
SegmentMerger: using segment data from: content crawl_generate crawl_fetch
crawl_parse parse_data parse_text
{code}
{code}
// mergesegs with array of segment directories
lmcgibbn@LMC-056430 /usr/local/nutch(master) $ ./runtime/local/bin/nutch
mergesegs mycrawl/MERGEDsegments3 mycrawl/segments/20180306143139/
mycrawl/MERGEDsegments/20180306143518/ mycrawl/MERGEDsegments2/20180306143617/
-filter
Merging 3 segments to mycrawl/MERGEDsegments3/20180306143709
SegmentMerger: adding mycrawl/segments/20180306143139
SegmentMerger: adding mycrawl/MERGEDsegments/20180306143518
mycrawl/MERGEDsegments/20180306143518 changed input dirs
SegmentMerger: adding mycrawl/MERGEDsegments2/20180306143617
SegmentMerger: using segment data from: crawl_generate crawl_parse
{code}
The difference i can see, is that upon successful execution of the mergesegs
command, locally I am left with two new directories, namely
{code}
ls mycrawl/MERGEDsegments/20180306143518/crawl_
crawl_generate/ crawl_parse/
{code}
was (Author: lewismc):
I cannot reproduce this... see below for tests
{code}
//inject
/usr/local/nutch(master) $ ./runtime/local/bin/nutch inject mycrawl/crawldb
urls/seed.txt
Injector: starting at 2018-03-06 14:31:10
Injector: crawlDb: mycrawl/crawldb
Injector: urlDir: urls/seed.txt
Injector: Converting injected urls to crawl db entries.
Injector: overwrite: false
Injector: update: false
Injector: Total urls rejected by filters: 0
Injector: Total urls injected after normalization and filtering: 1
Injector: Total urls injected but already in CrawlDb: 0
Injector: Total new urls injected: 1
Injector: finished at 2018-03-06 14:31:12, elapsed: 00:00:01
{code}
{code}
//simple 'ls' to see what we have
/usr/local/nutch(master) $ ls mycrawl/crawldb/
current/ old/
{code}
{code}
// generate
/usr/local/nutch(master) $ ./runtime/local/bin/nutch generate mycrawl/crawldb
mycrawl/segments 1
Generator: starting at 2018-03-06 14:31:37
Generator: Selecting best-scoring urls due for fetch.
Generator: filtering: true
Generator: normalizing: true
Generator: running in local mode, generating exactly one partition.
Generator: Partitioning selected urls for politeness.
Generator: segment: mycrawl/segments/20180306143139
Generator: finished at 2018-03-06 14:31:40, elapsed: 00:00:03
{code}
{code}
//fetch
/usr/local/nutch(master) $ ./runtime/local/bin/nutch fetch
mycrawl/segments/20180306143139 -threads 2
Fetcher: starting at 2018-03-06 14:32:15
Fetcher: segment: mycrawl/segments/20180306143139
Fetcher: threads: 2
Fetcher: time-out divisor: 2
QueueFeeder finished: total 1 records hit by time limit :0
FetcherThread 36 Using queue mode : byHost
FetcherThread 36 Using queue mode : byHost
FetcherThread 40 fetching http://nutch.apache.org:-1/ (queue crawl delay=5000ms)
Fetcher: throughput threshold: -1
Fetcher: throughput threshold retries: 5
FetcherThread 41 has no more work available
FetcherThread 41 -finishing thread FetcherThread, activeThreads=1
robots.txt whitelist not configured.
FetcherThread 40 has no more work available
FetcherThread 40 -finishing thread FetcherThread, activeThreads=0
-activeThreads=0, spinWaiting=0, fetchQueues.totalSize=0,
fetchQueues.getQueueCount=0
-activeThreads=0
Fetcher: finished at 2018-03-06 14:32:18, elapsed: 00:00:02
{code}
{code}
//parse
/usr/local/nutch(master) $ ./runtime/local/bin/nutch parse
mycrawl/segments/20180306143139 -threads 2
ParseSegment: starting at 2018-03-06 14:32:45
ParseSegment: segment: mycrawl/segments/20180306143139
Parsed (140ms):http://nutch.apache.org:-1/
ParseSegment: finished at 2018-03-06 14:32:46, elapsed: 00:00:01
{code}
{code}
// lets see what we have
/usr/local/nutch(master) $ ls mycrawl/
crawldb/ segments/
/usr/local/nutch(master) $ ls mycrawl/segments/20180306143139/
content/ crawl_fetch/ crawl_generate/ crawl_parse/ parse_data/
parse_text/
{code}
{code}
//updatedb
/usr/local/nutch(master) $ ./runtime/local/bin/nutch updatedb mycrawl/crawldb
mycrawl/segments/20180306143139/
CrawlDb update: starting at 2018-03-06 14:33:40
CrawlDb update: db: mycrawl/crawldb
CrawlDb update: segments: [mycrawl/segments/20180306143139]
CrawlDb update: additions allowed: true
CrawlDb update: URL normalizing: false
CrawlDb update: URL filtering: false
CrawlDb update: 404 purging: false
CrawlDb update: Merging segment data into db.
CrawlDb update: finished at 2018-03-06 14:33:41, elapsed: 00:00:01
{code}
{code}
//lets see what we have
/usr/local/nutch(master) $ ls mycrawl/
crawldb/ segments/
{code}
//mergesegs with -dir option
/usr/local/nutch(master) $ ./runtime/local/bin/nutch mergesegs
mycrawl/MERGEDsegments -dir mycrawl/segments/ -filter
Merging 1 segments to mycrawl/MERGEDsegments/20180306143518
SegmentMerger: adding file:/usr/local/nutch/mycrawl/segments/20180306143139
SegmentMerger: using segment data from: content crawl_generate crawl_fetch
crawl_parse parse_data parse_text
{code}
{code}
// lets see what we have
/usr/local/nutch(master) $ ls mycrawl/
MERGEDsegments/ crawldb/ segments/
/usr/local/nutch(master) $ ls mycrawl/MERGEDsegments/20180306143518/crawl_
crawl_generate/ crawl_parse/
{code}
{code}
//mergesegs with single segment directory without dir option
/usr/local/nutch(master) $ ./runtime/local/bin/nutch mergesegs
mycrawl/MERGEDsegments2 mycrawl/segments/20180306143139/ -filter
Merging 1 segments to mycrawl/MERGEDsegments2/20180306143617
SegmentMerger: adding mycrawl/segments/20180306143139
SegmentMerger: using segment data from: content crawl_generate crawl_fetch
crawl_parse parse_data parse_text
{code}
{code}
// mergesegs with array of segment directories
lmcgibbn@LMC-056430 /usr/local/nutch(master) $ ./runtime/local/bin/nutch
mergesegs mycrawl/MERGEDsegments3 mycrawl/segments/20180306143139/
mycrawl/MERGEDsegments/20180306143518/ mycrawl/MERGEDsegments2/20180306143617/
-filter
Merging 3 segments to mycrawl/MERGEDsegments3/20180306143709
SegmentMerger: adding mycrawl/segments/20180306143139
SegmentMerger: adding mycrawl/MERGEDsegments/20180306143518
mycrawl/MERGEDsegments/20180306143518 changed input dirs
SegmentMerger: adding mycrawl/MERGEDsegments2/20180306143617
SegmentMerger: using segment data from: crawl_generate crawl_parse
{code}
The difference i can see, is that upon successful execution of the mergesegs
command, locally I am left with two new directories, namely
{code}
ls mycrawl/MERGEDsegments/20180306143518/crawl_
crawl_generate/ crawl_parse/
{code}
> mergesegs corrupts segment data
> -------------------------------
>
> Key: NUTCH-2517
> URL: https://issues.apache.org/jira/browse/NUTCH-2517
> Project: Nutch
> Issue Type: Bug
> Components: segment
> Affects Versions: 1.15
> Environment: xubuntu 17.10, docker container of apache/nutch LATEST
> Reporter: Marco Ebbinghaus
> Priority: Blocker
> Labels: mapreduce, mergesegs
> Fix For: 1.15
>
> Attachments: Screenshot_2018-03-03_18-09-28.png
>
>
> The problem probably occurs since commit
> [https://github.com/apache/nutch/commit/54510e503f7da7301a59f5f0e5bf4509b37d35b4]
> How to reproduce:
> * create container from apache/nutch image (latest)
> * open terminal in that container
> * set http.agent.name
> * create crawldir and urls file
> * run bin/nutch inject (bin/nutch inject mycrawl/crawldb urls/urls)
> * run bin/nutch generate (bin/nutch generate mycrawl/crawldb
> mycrawl/segments 1)
> ** this results in a segment (e.g. 20180304134215)
> * run bin/nutch fetch (bin/nutch fetch mycrawl/segments/20180304134215
> -threads 2)
> * run bin/nutch parse (bin/nutch parse mycrawl/segments/20180304134215
> -threads 2)
> ** ls in the segment folder -> existing folders: content, crawl_fetch,
> crawl_generate, crawl_parse, parse_data, parse_text
> * run bin/nutch updatedb (bin/nutch updatedb mycrawl/crawldb
> mycrawl/segments/20180304134215)
> * run bin/nutch mergesegs (bin/nutch mergesegs mycrawl/MERGEDsegments
> mycrawl/segments/* -filter)
> ** console output: `SegmentMerger: using segment data from: content
> crawl_generate crawl_fetch crawl_parse parse_data parse_text`
> ** resulting segment: 20180304134535
> * ls in mycrawl/MERGEDsegments/segment/20180304134535 -> only existing
> folder: crawl_generate
> * run bin/nutch invertlinks (bin/nutch invertlinks mycrawl/linkdb -dir
> mycrawl/MERGEDsegments) which results in a consequential error
> ** console output: `LinkDb: adding segment:
> [file:/root/nutch_source/runtime/local/mycrawl/MERGEDsegments/20180304134535|file:///root/nutch_source/runtime/local/mycrawl/MERGEDsegments/20180304134535]
> LinkDb: org.apache.hadoop.mapreduce.lib.input.InvalidInputException: Input
> path does not exist:
> [file:/root/nutch_source/runtime/local/mycrawl/MERGEDsegments/20180304134535/parse_data|file:///root/nutch_source/runtime/local/mycrawl/MERGEDsegments/20180304134535/parse_data]
> at
> org.apache.hadoop.mapreduce.lib.input.FileInputFormat.singleThreadedListStatus(FileInputFormat.java:323)
> at
> org.apache.hadoop.mapreduce.lib.input.FileInputFormat.listStatus(FileInputFormat.java:265)
> at
> org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat.listStatus(SequenceFileInputFormat.java:59)
> at
> org.apache.hadoop.mapreduce.lib.input.FileInputFormat.getSplits(FileInputFormat.java:387)
> at
> org.apache.hadoop.mapreduce.JobSubmitter.writeNewSplits(JobSubmitter.java:301)
> at
> org.apache.hadoop.mapreduce.JobSubmitter.writeSplits(JobSubmitter.java:318)
> at
> org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:196)
> at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1290)
> at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1287)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1746)
> at org.apache.hadoop.mapreduce.Job.submit(Job.java:1287)
> at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1308)
> at org.apache.nutch.crawl.LinkDb.invert(LinkDb.java:224)
> at org.apache.nutch.crawl.LinkDb.run(LinkDb.java:353)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
> at org.apache.nutch.crawl.LinkDb.main(LinkDb.java:313)`
> So as it seems mapreduce corrupts the segment folder during mergesegs command.
>
> Pay attention to the fact that this issue is not related on trying to merge a
> single segment like described above. As you can see on the attached
> screenshot that problem also appears when executing multiple bin/nutch
> generate/fetch/parse/updatedb commands before executing mergesegs - resulting
> in a segment count > 1.
>
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