Java Admin.isTableDisabled方法代碼示例

import org.apache.hadoop.hbase.client.Admin; //導入方法依賴的package包/類
public void waitTableDisabled(Admin admin, byte[] table, long timeoutMillis)
    throws InterruptedException, IOException {
  TableName tableName = TableName.valueOf(table);
  long startWait = System.currentTimeMillis();
  while (!admin.isTableDisabled(tableName)) {
    assertTrue("Timed out waiting for table to become disabled " +
            Bytes.toStringBinary(table),
        System.currentTimeMillis() - startWait < timeoutMillis);
    Thread.sleep(200);
  }
}
 

import org.apache.hadoop.hbase.client.Admin; //導入方法依賴的package包/類
/**
 * Scans the table and merges two adjacent regions if they are small. This
 * only happens when a lot of rows are deleted.
 *
 * When merging the hbase:meta region, the HBase instance must be offline.
 * When merging a normal table, the HBase instance must be online, but the
 * table must be disabled.
 *
 * @param conf        - configuration object for HBase
 * @param fs          - FileSystem where regions reside
 * @param tableName   - Table to be compacted
 * @param testMasterRunning True if we are to verify master is down before
 * running merge
 * @throws IOException
 */
public static void merge(Configuration conf, FileSystem fs,
  final TableName tableName, final boolean testMasterRunning)
throws IOException {
  boolean masterIsRunning = false;
  if (testMasterRunning) {
    masterIsRunning = HConnectionManager
        .execute(new HConnectable<Boolean>(conf) {
          @Override
          public Boolean connect(HConnection connection) throws IOException {
            return connection.isMasterRunning();
          }
        });
  }
  if (tableName.equals(TableName.META_TABLE_NAME)) {
    if (masterIsRunning) {
      throw new IllegalStateException(
          "Can not compact hbase:meta table if instance is on-line");
    }
    // TODO reenable new OfflineMerger(conf, fs).process();
  } else {
    if(!masterIsRunning) {
      throw new IllegalStateException(
          "HBase instance must be running to merge a normal table");
    }
    Admin admin = new HBaseAdmin(conf);
    try {
      if (!admin.isTableDisabled(tableName)) {
        throw new TableNotDisabledException(tableName);
      }
    } finally {
      admin.close();
    }
    new OnlineMerger(conf, fs, tableName).process();
  }
}
 

import org.apache.hadoop.hbase.client.Admin; //導入方法依賴的package包/類
/**
 * Truncate a table using the admin command.
 * Effectively disables, deletes, and recreates the table.
 * @param tableName table which must exist.
 * @param preserveRegions keep the existing split points
 * @return HTable for the new table
 */
public HTable truncateTable(final TableName tableName, final boolean preserveRegions)
    throws IOException {
  Admin admin = getHBaseAdmin();
  if (!admin.isTableDisabled(tableName)) {
    admin.disableTable(tableName);
  }
  admin.truncateTable(tableName, preserveRegions);
  return new HTable(getConfiguration(), tableName);
}