Lars Hofhansl commented on HBASE-5848:

Interestingly, I cannot reproduce this in a test. MiniCluster seems to be 
different enough to not have this problem.
> Create table with EMPTY_START_ROW passed as splitKey causes the HMaster to 
> abort
> --------------------------------------------------------------------------------
>                 Key: HBASE-5848
>                 URL: https://issues.apache.org/jira/browse/HBASE-5848
>             Project: HBase
>          Issue Type: Bug
>          Components: client
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>            Priority: Minor
> A coworker of mine just had this scenario. It does not make sense the 
> EMPTY_START_ROW as splitKey (since the region with the empty start key is 
> implicit), but it should not cause the HMaster to abort.
> The abort happens because it tries to bulk assign the same region twice and 
> then runs into race conditions with ZK.
> The same would (presumably) happen when two identical split keys are passed, 
> but the client blocks that. The simplest solution here is to also block 
> passed null or EMPTY_START_ROW as split key by the client.

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