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From "Lars George (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-3432) [hbck] Add "remove table" switch
Date Sat, 08 Jan 2011 14:14:45 GMT
[hbck] Add "remove table" switch

                 Key: HBASE-3432
                 URL: https://issues.apache.org/jira/browse/HBASE-3432
             Project: HBase
          Issue Type: New Feature
          Components: util
    Affects Versions: 0.89.20100924
            Reporter: Lars George
            Priority: Minor
             Fix For: 0.92.0

This happened before and I am not sure how the new Master improves on it (this stuff is only
available between the lines are buried in some peoples heads - one other thing I wish was
for a better place to communicate what each path improves). Just so we do not miss it, there
is an issue that sometimes disabling large tables simply times out and the table gets stuck
in limbo. 

>From the CDH User list:

On Fri, Jan 7, 2011 at 1:57 PM, Sean Sechrist <ssechrist@gmail.com> wrote:
To get them out of META, you can just scan '.META.' for that table name, and delete those
rows. We had to do that a few months ago.


That did it.  For the benefit of others, here's code.  Beware the literal table names, run
at your own peril.

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.MetaScanner;
import org.apache.hadoop.hbase.util.Bytes;

public class CleanFromMeta {
    public static class Cleaner implements MetaScanner.MetaScannerVisitor {
        public HTable meta = null;
        public Cleaner(Configuration conf) throws IOException {
            meta = new HTable(conf, ".META.");

        public boolean processRow(Result rowResult) throws IOException {
            String r = new String(rowResult.getRow());
            if (r.startsWith("webtable,")) {
                meta.delete(new Delete(rowResult.getRow()));
                System.out.println("Deleting row " + rowResult);
            return true;

    public static void main(String[] args) throws Exception {
        String tname = ".META.";
        Configuration conf = HBaseConfiguration.create();
                             new Cleaner(conf), 

I suggest to move this into HBaseFsck. I do not like personally to have these JRuby scripts
floating around that may or may not help. This should be available if a user gets stuck and
knows what he is doing (they can delete from .META. anyways). Maybe a "--disable-table <tablename>
--force" or so? But since disable is already in the shell we could add an "--force" there?
Or add a "--delete-table <tablename>" to the hbck?

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