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https://issues.apache.org/jira/browse/HBASE-5509?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lars Hofhansl updated HBASE-5509:
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Attachment: 5509.txt
This is essentially the patch I got from Karthik.
I made the following changes:
1. API changes for trunk.
2. Also copies and patches .tableinfo files as needed.
3. ImportTable can proceed even while HBase is down (HDFS needs to be up
obviously). Regions will assigned upon HBase startup.
4. A ZK quorum can be optionally provided to assign imported regions right away
(needed in trunk).
5. Some safety checks to verify the backup directory provided for import is in
fact a backup directory (otherwise in some case adjacent directories were
overwritten with temporary files).
> MR based copier for copying HFiles (trunk version)
> --------------------------------------------------
>
> Key: HBASE-5509
> URL: https://issues.apache.org/jira/browse/HBASE-5509
> Project: HBase
> Issue Type: Sub-task
> Components: documentation, regionserver
> Reporter: Karthik Ranganathan
> Assignee: Lars Hofhansl
> Fix For: 0.94.0, 0.96.0
>
> Attachments: 5509.txt
>
>
> This copier is a modification of the distcp tool in HDFS. It does the
> following:
> 1. List out all the regions in the HBase cluster for the required table
> 2. Write the above out to a file
> 3. Each mapper
> 3.1 lists all the HFiles for a given region by querying the regionserver
> 3.2 copies all the HFiles
> 3.3 outputs success if the copy succeeded, failure otherwise. Failed
> regions are retried in another loop
> 4. Mappers are placed on nodes which have maximum locality for a given region
> to speed up copying
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