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https://issues.apache.org/jira/browse/SOLR-4127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13529134#comment-13529134
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Lukas Graf commented on SOLR-4127:
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In my experience, the same symptoms could possibly be caused by either
* using the wrong syntax for the atomic update instructions
* or using the atomic "add" update instruction in an XML update message, which
apparently isn't implemented (only in JSON).
If nobody beats me to it, I will add two separate issues for those.
> Atomic updates used w/o updateLog should throw an error
> -------------------------------------------------------
>
> Key: SOLR-4127
> URL: https://issues.apache.org/jira/browse/SOLR-4127
> Project: Solr
> Issue Type: Bug
> Components: update
> Affects Versions: 4.0
> Reporter: Lukas Graf
> Assignee: Hoss Man
> Fix For: 4.1
>
> Attachments: SOLR-4127.patch
>
>
> The atomic update feature described in
> [SOLR-139|https://issues.apache.org/jira/browse/SOLR-139] seems to depend on
> having an {{<updateLog />}} configured in {{solrconfig.xml}}.
> When used without an update log, the update commands like {{set}} or {{add}}
> don't result in an error and the transaction being aborted, but produce
> garbled documents instead. This is the case for both the XML and JSON formats
> for the update message.
> Example:
> I initially created some content like this:
> {code}
> $ curl 'localhost:8983/solr/update?commit=true' -H
> 'Content-type:application/json' -d '
> [{"id":"7cb8a43c","Title":"My original Title", "Creator": "John Doe"}]'
> {code}
> Which resulted in this document:
> {code:xml}
> <doc>
> <str name="id">7cb8a43c</str>
> <str name="Title">My original Title</str>
> <str name="Creator">John Doe</str>
> </doc>
> {code}
> Then I attempted to update that document with this statement:
> {code}
> $ curl 'localhost:8983/solr/update?commit=true' -H
> 'Content-type:application/json' -d '
> [{"id":"7cb8a43c","Title":{"set":"My new title"}}]'
> {code}
> Which resulted in this garbled document, with the fields that weren't updated
> missing:
> {code:xml}
> <doc>
> <str name="id">7cb8a43c</str>
> <str name="Title">{set=My new title}</str>
> </doc>
> {code}
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