[jira] [Commented] (SOLR-4455) Stored value of "NOW" differs between replicas

["Erick Erickson (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-4455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16479154#comment-16479154 ] 

Erick Erickson commented on SOLR-4455:
--------------------------------------

[~hossman]Is this still current? Happened to run across it searching for something else.


> Stored value of "NOW" differs between replicas
> ----------------------------------------------
>
>                 Key: SOLR-4455
>                 URL: https://issues.apache.org/jira/browse/SOLR-4455
>             Project: Solr
>          Issue Type: Bug
>          Components: update
>    Affects Versions: 4.1
>            Reporter: Colin Bartolome
>            Assignee: Hoss Man
>            Priority: Minor
>         Attachments: SOLR-4455.patch
>
>
> I have a field in {{schema.xml}} defined like this:
> {code:xml}
> <field name="timestamp" type="date" indexed="true" stored="true" default="NOW" />
> {code}
> When I perform a query that's load-balanced across the servers in my cloud, the value stored in that field differs slightly between each replica for the same returned document.
> I haven't seen this field differ by more than a tenth of a second and I'm not running queries against it, but I can picture a situation where somebody has one replica returning 23:59:59.990 and another returning 00:00:00.010 and a query starts behaving oddly.
> It seems like the leader should evaluate what "NOW" means and the replicas should copy that value.
> {panel:title=Possible Workaround}
> A possible workaround for this issue is to use the TimestampUpdateProcessorFactory in your update processor chain prior to the DistributedUpdateProcessor instead of relying on the using "NOW" as a default value for date fields.
> This will cause the timestamp field of each document to be filled in with a value before the documents are forwarded to any shards (or written to the transaction log) 
> https://lucene.apache.org/solr/4_1_0/solr-core/org/apache/solr/update/processor/TimestampUpdateProcessorFactory.html
> {panel}



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