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From "Michael Bieniosek (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-655) need programmatic way to add column family: need programmatic way to enable/disable table
Date Sun, 01 Jun 2008 19:37:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12601488#action_12601488
] 

Michael Bieniosek commented on HBASE-655:
-----------------------------------------

enableTable isn't synchronous, so if I call add/modify/deleteColumn immediately after calling
enableTable, I get an exception because the table isn't disabled.  

There's no way to know how long to wait for the table to go offline.  There's no way to wait
in a loop and check to see if the table is offline.  The best I can do is sleep and catch
TableNotDisabledException in a loop, which seems kind of silly.

> need programmatic way to add column family: need programmatic way to enable/disable table
> -----------------------------------------------------------------------------------------
>
>                 Key: HBASE-655
>                 URL: https://issues.apache.org/jira/browse/HBASE-655
>             Project: Hadoop HBase
>          Issue Type: Bug
>            Reporter: Michael Bieniosek
>             Fix For: 0.2.0
>
>
> From HADOOP-2292:
> > What you might do is open a HTable on the META region (HConstants.META_TABLE_NAME)
and scan HConstants.COL_REGIONINFO_ARRAY which will give you back HRegionInfo objects (as
bytes).
> > Find the table in question by comparing your table name to regionInfo.getTableDesc().getName()
> > If adding or deleting columns, check regionInfo.getTableDesc().hasFamily()
> > If changing table on/off line check regionInfo.isOffline()
> > If any of the regions don't meet the criteria, close the scanner, sleep and rescan.
> This is a bit too complicated for me.  If you won't make enableTable/disableTable synchronous,
we should at least have a HTable.isTableDisabled method.

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