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https://issues.apache.org/jira/browse/HBASE-2560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12868479#action_12868479
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Todd Lipcon commented on HBASE-2560:
------------------------------------

-            if (value != null) {
+            if (value != null && value.length > 0) {

fixed the issue, need to write a unit test though (should be straightforward 
enough)

> IllegalArgumentException when manually splitting table from web UI
> ------------------------------------------------------------------
>
>                 Key: HBASE-2560
>                 URL: https://issues.apache.org/jira/browse/HBASE-2560
>             Project: Hadoop HBase
>          Issue Type: Bug
>          Components: master
>    Affects Versions: 0.21.0
>            Reporter: Todd Lipcon
>            Priority: Critical
>
> Clicked split once, then again, got an error:
> http://monster01.sf.cloudera.com:60010/table.jsp?action=split&name=VerifiableEditor&key=
> java.lang.IllegalArgumentException: Not a host:port pair: 
>       at org.apache.hadoop.hbase.HServerAddress.(HServerAddress.java:57)
>       at 
> org.apache.hadoop.hbase.master.HMaster.getTableRegions(HMaster.java:841)
>       at org.apache.hadoop.hbase.master.HMaster.modifyTable(HMaster.java:981)

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