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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (NUTCH-2616) Review routing of deletions by Exchange component
Date Tue, 17 Jul 2018 13:46:00 GMT

    [ https://issues.apache.org/jira/browse/NUTCH-2616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16546622#comment-16546622
] 

ASF GitHub Bot commented on NUTCH-2616:
---------------------------------------

r0ann3l commented on issue #363: NUTCH-2616 Review routing of deletions by Exchange component
URL: https://github.com/apache/nutch/pull/363#issuecomment-405587261
 
 
   +1 lgtm. Thanks @sebastian-nagel 

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> Review routing of deletions by Exchange component
> -------------------------------------------------
>
>                 Key: NUTCH-2616
>                 URL: https://issues.apache.org/jira/browse/NUTCH-2616
>             Project: Nutch
>          Issue Type: Bug
>          Components: indexer
>    Affects Versions: 1.15
>            Reporter: Sebastian Nagel
>            Priority: Major
>             Fix For: 1.15
>
>
> If the exchange component (NUTCH-2412) is enabled it must also route deletions (404,
etc.) to the configured index writers. Deletions are done alone using the document ID (URL),
there is no NutchDocument (or it's null) which needs to handled to avoid an NPE in the Exchanges
class or the exchange plugins.
> NUTCH-2412 has added a new delete method in the IndexWriters class:
> - {{delete(String, NutchDocument)}} is now called from the indexing job ({{bin/nutch
index ... -deleteGone}}). However, the NutchDocument is always null in case of deletions,
see IndexerMapReduce.DELETE_ACTION.
> - {{delete(String)}} is now a no-op but is still called from CleaningJob ({{bin/nutch
clean ...}})
> We could ([~roannel], are there better options?)
> - send deletions to all index writers. This causes a certain overhead (could be critical
if deletion lists are long).
> - pass a document containing only a single field (the document ID / URL) to the exchange
component.



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