[jira] Commented: (HBASE-3488) Allow RowCounter to retrieve multiple versions of rows

["Jonathan Gray (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-3488?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12988390#action_12988390 ] 

Jonathan Gray commented on HBASE-3488:
--------------------------------------

So would the idea be to not actually count rows but to count either columns or versions of columns?  As I recall, most of the row counting stuff is using FirstKeyOnlyFilter and is optimized to count unique rows regardless if they have one version of one column or a millions versions of a million columns.

Also, I don't recommend the {{Result.getMap()}} API.  It's a convenience method but it's not especially performant (it iterates all the keys, parses stuff, allocates new byte[]s, and builds up the map).  Instead you should just use {{Result.raw()}} and operate on the list of KeyValues returned.

> Allow RowCounter to retrieve multiple versions of rows
> ------------------------------------------------------
>
>                 Key: HBASE-3488
>                 URL: https://issues.apache.org/jira/browse/HBASE-3488
>             Project: HBase
>          Issue Type: Bug
>          Components: util
>    Affects Versions: 0.90.0
>            Reporter: Ted Yu
>             Fix For: 0.92.0
>
>
> Currently RowCounter only retrieves latest version for each row.
> Some applications would store multiple versions for the same row.
> RowCounter should accept a new parameter for the number of versions to return.
> Scan object would be configured with version parameter.
> Then the following API should be called:
> {code}
>   public NavigableMap<byte[], NavigableMap<byte[], NavigableMap<Long, byte[]>>> getMap() {
> {code}

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