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https://issues.apache.org/jira/browse/BLUR-344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14093046#comment-14093046
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Tim Williams commented on BLUR-344:
-----------------------------------
nope, it's misplaced. i'll fix it now, thanks
> Expose a Scanner capability that allows various implementations (e.g.
> ExportScanner)
> ------------------------------------------------------------------------------------
>
> Key: BLUR-344
> URL: https://issues.apache.org/jira/browse/BLUR-344
> Project: Apache Blur
> Issue Type: New Feature
> Components: Blur
> Reporter: Tim Williams
> Assignee: Tim Williams
>
> Blur should have the ability to have "scanner" plugins that, given a query,
> are handed all the matching records of the query. These would be async long
> running calls from the thrift api perspective.
> The scanner would essentially be given a collector of the hits with the
> fields defined by the passed in selector.
> The client would ask for a scan, then poll for the status periodically and -
> depending on the Scanner implementation - pick up the results in whatever
> form they were requested.
> For a concrete implementation, think of export. The ExportScanner would be
> given a location in HDFS and scan over all the results and drop them in that
> directory - maybe in a particular requested form. The Scanner pattern could
> be have many useful implementations though - for example, to insert a subset
> of the data into a new Blur Table.
> Here are some client API thoughts:
> {code}
> struct ScannerQuery {
> 1:Query query,
> 2:Selector selector,
> 3:string id,
> 4:string userContext,
> 5:string scannerName,
> 6:i64 startTime = 0,
> 7:map<string,string> properties
> }
> enum ScanStatus {
> COMPLETE,
> RUNNING,
> ERROR
> }
> void scan(
> 1:ScannerQuery scannerQuery
> ) throws (1:BlurException ex)
> list<string> scanList(
> ) throws (1:BlurException ex)
> ScanStatus statusScan(
> 1:string scanId
> ) throws (1:BlurException ex)
> void cancelScan(
> 1:string scanId
> ) throws (1:BlurException ex)
> {code}
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