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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-48) [hbase] Bulk load and dump tools
Date Wed, 06 Feb 2008 23:51:08 GMT

    [ https://issues.apache.org/jira/browse/HBASE-48?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12566400#action_12566400

stack commented on HBASE-48:

If a new table, make a region per reducer (Configure many reducers if table is big).  The
framework will have done the sorting (lexigraphically if thats our key compare function) for
us  (Might have to add to the framework to ensure we don't split a key in the middle of a

If a table that already exists, would be reducer per existing region and yeah, there'll be
a splitting and compacting price to pay.

To see difference in speeds going via API versus writing direct to mapfiles, see primitive
PerformanceEvaluation and compare numbers writing mapfiles directly rather than going API.

> [hbase] Bulk load and dump tools
> --------------------------------
>                 Key: HBASE-48
>                 URL: https://issues.apache.org/jira/browse/HBASE-48
>             Project: Hadoop HBase
>          Issue Type: New Feature
>            Reporter: stack
>            Priority: Minor
> Hbase needs tools to facilitate bulk upload and possibly dumping.  Going via the current
APIs, particularly if the dataset is large and cell content is small, uploads can take a long
time even when using many concurrent clients.
> PNUTS folks talked of need for a different API to manage bulk upload/dump.
> Another notion would be to somehow have the bulk loader tools somehow write regions directly
in hdfs.

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