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Date: Thu, 22 Jan 2015 09:18:35 +0000 (UTC)
From: "Alfonso Nishikawa (JIRA)" <jira@apache.org>
To: dev@gora.apache.org
Message-ID: <JIRA.12756937.1416564574000.144049.1421918315862@Atlassian.JIRA>
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Subject: [jira] [Commented] (GORA-401) Serialization and deserialization of
 Persistent does not hold the entity dirty state from Map to Reduce
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    [ https://issues.apache.org/jira/browse/GORA-401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14287152#comment-14287152 ] 

Alfonso Nishikawa commented on GORA-401:
----------------------------------------

Oh, I think I forgot to write map reduce serialization tests for the other datastores.... :S

> Serialization and deserialization of Persistent does not hold the entity dirty state from Map to Reduce
> -------------------------------------------------------------------------------------------------------
>
>                 Key: GORA-401
>                 URL: https://issues.apache.org/jira/browse/GORA-401
>             Project: Apache Gora
>          Issue Type: Bug
>          Components: gora-core
>    Affects Versions: 0.4, 0.5
>         Environment: Tested on gora-0.4, but seems logically to hold on gora-0.5. HBase backend.
>            Reporter: Alfonso Nishikawa
>            Priority: Critical
>              Labels: serialization
>         Attachments: GORA-401-tests.patch, GORA-401v1.patch, GORA-401v2.patch
>
>   Original Estimate: 35h
>          Time Spent: 21h
>  Remaining Estimate: 14h
>
> After removing __g__dirty field in GORA-326, dirty field is not serialized. In GORA-321 {{[PersistentSerializer|https://github.com/apache/gora/blob/master/gora-core/src/main/java/org/apache/gora/mapreduce/PersistentSerializer.java]}} went from using {{[PersistentDatumWriter|https://github.com/apache/gora/blob/apache-gora-0.3/gora-core/src/main/java/org/apache/gora/avro/PersistentDatumWriter.java](/Reader)}} to Avro's {{SpecificDatumWriter}}, delegating the serialization of the dirty field to Avro (but really not desirable to have that field as a main field in the entities).
> The proposal is to reintroduce the {{PersistentDatumWriter/Reader}} which will serialize the internal fields of the entities.
> This bug affects, for example, Nutch, which loads only some fields in it's phases, serializes entities (from Map to Reduce), and when deserializes finds all fields as "dirty", independently of what fields were modified in the Map, and overwrite all data in datastore (deleting much things: downloaded content, parsed content, etc).
> This effect can be seen in {{TestPersistentSerialization#testSerderEmployeeTwoFields}}, when debuging in {{TestIOUtils#testSerializeDeserialize}}. Proper breakpoints an inspections shows that, entities are "equal" when it's fields are equal. This is fine as "equal" definition, but another test must be added to check that serialization an deserialization keeps the dirty state.


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