[jira] [Resolved] (HBASE-16935) Java API method Admin.deleteColumn(table, columnFamily) doesn't delete family's StoreFile from file system.

["Mikhail Zvagelsky (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-16935?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mikhail Zvagelsky resolved HBASE-16935.
---------------------------------------
    Resolution: Not A Problem

> Java API method Admin.deleteColumn(table, columnFamily) doesn't delete family's StoreFile from file system.
> -----------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-16935
>                 URL: https://issues.apache.org/jira/browse/HBASE-16935
>             Project: HBase
>          Issue Type: Bug
>          Components: Admin
>    Affects Versions: 1.2.3
>            Reporter: Mikhail Zvagelsky
>         Attachments: Selection_008.png
>
>
> The method deleteColumn(TableName tableName, byte[] columnName) of the class org.apache.hadoop.hbase.client.Admin shoud delete specified column family from specified table. (Despite of its name the method removes the family, not a column - view the [issue| https://issues.apache.org/jira/browse/HBASE-1989].)
> This method changes the table's schema, but it doesn't delete column family's Store File from a file system. To be precise - I run this code:
> {code:|borderStyle=solid}
> import java.io.IOException;
> import org.apache.hadoop.conf.Configuration;
> import org.apache.hadoop.hbase.HBaseConfiguration;
> import org.apache.hadoop.hbase.HColumnDescriptor;
> import org.apache.hadoop.hbase.HTableDescriptor;
> import org.apache.hadoop.hbase.TableName;
> import org.apache.hadoop.hbase.client.*;
> import org.apache.hadoop.hbase.util.Bytes;
> public class ToHBaseIssueTracker {
>     public static void main(String[] args) throws IOException {
>         TableName tableName = TableName.valueOf("test_table");
>         HTableDescriptor desc = new HTableDescriptor(tableName);
>         desc.addFamily(new HColumnDescriptor("cf1"));
>         desc.addFamily(new HColumnDescriptor("cf2"));
>         Configuration conf = HBaseConfiguration.create();
>         Connection connection = ConnectionFactory.createConnection(conf);
>         Admin admin = connection.getAdmin();
>         admin.createTable(desc);
>         HTable table = new HTable(conf, "test_table");
>         for (int i = 0; i < 4; i++) {
>             Put put = new Put(Bytes.toBytes(i)); // Use i as row key.
>             put.addColumn(Bytes.toBytes("cf1"), Bytes.toBytes("a"), Bytes.toBytes("value"));
>             put.addColumn(Bytes.toBytes("cf2"), Bytes.toBytes("a"), Bytes.toBytes("value"));
>             table.put(put);
>         }
>         admin.deleteColumn(tableName, Bytes.toBytes("cf2"));
>         admin.majorCompact(tableName);
>         admin.close();
>     }
> }
> {code}
> Then I see that the store file for the "cf2" family persists in file system.
> I observe this effect in standalone hbase installation and in pseudo-distributed mode.



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