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From Jean-Daniel Cryans <jdcry...@apache.org>
Subject Re: truncate large table suggestion
Date Wed, 01 Sep 2010 18:36:44 GMT
One trick is to pre- force flush the table. Also try out the new 0.89,
it has 2 fixes regarding a race condition between the BaseScanner and
the closing of regions. The release candidate is here


On Wed, Sep 1, 2010 at 11:28 AM, Jinsong Hu <jinsong_hu@hotmail.com> wrote:
> Hi, Team:
>  I have noticed that the truncate/drop table with large amount of data fails
> and actually corrupt the hbase. In the worse case, we can't even
> create the table with the same name any more and I was forced to dump the
> whole hbase records and recreate all tables again.
>  I noticed there is a rename command and I tried that one, it turns out it
> actually works. One problem it causes is that the hbase master run out of
> memory after I run the command. but after restart it, I am able to recreate
> the table since the old table is renamed.
>  I then disable the renamed table and drop it, but it is not really
> successful. the table disappears from the list command, but if I recreate a
> table with the new name, the shell says it exist already. the regionserver
> shows that they still have regions with the renamed table.
>  In the end, I have to write a utility to remove data from the renamed
> table, I will try to see if this trick works although it is expensive.
>  Can the disable/truncate or drop for large table be fixed ?
> Jimmy.

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