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https://issues.apache.org/jira/browse/HBASE-48?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12617222#action_12617222
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stack commented on HBASE-48:
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Thinking more on this issue, in particular on Billy's suggestion above ('Billy
Pearson - 06/Feb/08 01:07 PM'), bulk uploading by writing store files ain't
hard:
For a new table (as per Bryan above), its particularly easy. Do something like:
+ Create table in hbase
+ Mark it read-only or disabled even.
+ Start mapreduce job. In its configuration would go to the master to read the
table description.
+ Map reads whatever the input using whatever formatter and ouputs from the map
using HStoreKey for key and cell content for value.
+ Job would use fancy new TableFileReduce. Each reducer would write a region.
It'd know what for start and end keys -- they'd be the first and last it'd see.
Could output these somewhere so a tail task could find them. The file
outputter would need to also do sequenceids of some form.
+ When job was done, tail task would insert regions into meta using MetaUtils.
+ Enable the table.
+ If regions are lop-sided, hbase will do the fixup.
If table already exists:
+ Mark table read-only (ensure this prevents splits and that it means memcache
is flushed)
+ Start a mapreduce job that read from master the table schema and its regions
(and the master's current time so we don't write records older).
+ Map as above.
+ Reducer as above only insert smarter partitioner, one that respected region
boundaries and that made a reducer per current region.
+ Enable hbase and let it fix up where storefiles written were too big by
splitting etc.
It don't seem hard at all to do.
> [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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