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https://issues.apache.org/jira/browse/HBASE-9249?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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rajeshbabu updated HBASE-9249:
------------------------------
Description:
This hook helps to perform split on user region and corresponding index region
such that both will be split or none.
With this hook split for user and index region as follows
user region
===========
1) Create splitting znode for user region split
2) Close parent user region
3) split user region storefiles
4) instantiate child regions of user region
Through the new hook we can call index region transitions as below
index region
===========
5) Create splitting znode for index region split
6) Close parent index region
7) Split storefiles of index region
8) instantiate child regions of the index region
If any failures in 5,6,7,8 rollback the steps and return null, on null return
throw exception to rollback for 1,2,3,4
9) set PONR
10) do batch put of offline and split entries for user and index regions
index region
============
11) open daughers of index regions and transition znode to split. This step we
will do through preSplitAfterPONR hook. Opening index regions before opening
user regions helps to avoid put failures if there is colocation mismatch(this
can happen if user regions opening completed but index regions opening in
progress)
user region
===========
12) open daughers of user regions and transition znode to split.
Even if region server crashes also at the end both user and index regions will
be split or none
was:
This hook helps to perform split on user region and corresponding index region
such that both will be split or none.
With this hook split for user and index region as follows
user region
===========
1) Create splitting znode for user region split
2) Close parent user region
3) split user region storefiles
4) instantiate child regions of user region
Through the new hook we can call index region transitions as below
index region
===========
5) Create splitting znode for index region split
6) Close parent index region
7) Split storefiles of index region
8) instantiate child regions of the index region
If any failures in 5,6,7,8 rollback the steps and return null, on null return
throw exception to rollback for 1,2,3,4
9) set PONR
10) do batch put of offline and split entries for user and index regions
index region
============
11) open daughers of index regions and transition znode to split. This step we
will do through
user region
===========
12) open daughers of user regions and transition znode to split.
We can open index region daughters and transition znode to split through
postSplit hook which is already present.
Even if region server crashes also at the end both user and index regions will
be split or none
> Add cp hook before setting PONR in split
> ----------------------------------------
>
> Key: HBASE-9249
> URL: https://issues.apache.org/jira/browse/HBASE-9249
> Project: HBase
> Issue Type: Sub-task
> Reporter: rajeshbabu
> Attachments: HBASE-9249.patch
>
>
> This hook helps to perform split on user region and corresponding index
> region such that both will be split or none.
> With this hook split for user and index region as follows
> user region
> ===========
> 1) Create splitting znode for user region split
> 2) Close parent user region
> 3) split user region storefiles
> 4) instantiate child regions of user region
> Through the new hook we can call index region transitions as below
> index region
> ===========
> 5) Create splitting znode for index region split
> 6) Close parent index region
> 7) Split storefiles of index region
> 8) instantiate child regions of the index region
> If any failures in 5,6,7,8 rollback the steps and return null, on null return
> throw exception to rollback for 1,2,3,4
> 9) set PONR
> 10) do batch put of offline and split entries for user and index regions
> index region
> ============
> 11) open daughers of index regions and transition znode to split. This step
> we will do through preSplitAfterPONR hook. Opening index regions before
> opening user regions helps to avoid put failures if there is colocation
> mismatch(this can happen if user regions opening completed but index regions
> opening in progress)
> user region
> ===========
> 12) open daughers of user regions and transition znode to split.
> Even if region server crashes also at the end both user and index regions
> will be split or none
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