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From "Mikhail Zvagelsky (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-16935) Java API method Admin.deleteColumn(table, columnFamily) doesn't delete family's StoreFile from file system.
Date Mon, 24 Oct 2016 14:39:59 GMT
Mikhail Zvagelsky created HBASE-16935:
-----------------------------------------

             Summary: 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


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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