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package parallelai.spyglass.hbase;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.filter.Filter;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.mapred.InputFormat;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.JobConfigurable;
import org.apache.hadoop.util.StringUtils;
import java.util.Collection;
import java.util.TreeSet;
import java.util.UUID;
/**
* For reading from HBase this class provides all the wiring
*
* The idea is before a Tap is created the parameters populate the JobConf
* In this class we pick up the parameters from the JobConf and set up our logic,
* i.e. which HBase columns to read, what is the start/stop key etc
*/
public abstract class HBaseInputFormatBase implements InputFormat<ImmutableBytesWritable, Result>, JobConfigurable {
private final Log LOG = LogFactory.getLog(HBaseInputFormatBase.class);
protected final String id = UUID.randomUUID().toString();
protected byte[][] inputColumns;
protected HTable table;
protected Filter rowFilter;
/**
* Use the following two mappings to specify table columns and input table to the jobconf
* Later on we can pick them up with job.get(COLUMN_LIST)
*/
public static final String COLUMN_LIST = "hbase.tablecolumns";
protected static final String INPUT_TABLE = "hbase.inputtable";
protected String startKey = null;
protected String stopKey = null;
protected HBaseConstants.SourceMode sourceMode = HBaseConstants.SourceMode.EMPTY;
protected TreeSet<String> keyList = null;
protected int versions = 1;
protected boolean useSalt = false;
protected String prefixList = HBaseSalter.DEFAULT_PREFIX_LIST;
@Override
public void configure(JobConf job) {
String tableName = getTableName(job);
String colArg = job.get(COLUMN_LIST);
String[] colNames = colArg.split(" ");
byte[][] m_cols = new byte[colNames.length][];
for (int i = 0; i < m_cols.length; i++) {
m_cols[i] = Bytes.toBytes(colNames[i]);
}
setInputColumns(m_cols);
try {
setHTable(new HTable(HBaseConfiguration.create(job), tableName));
} catch (Exception e) {
LOG.error("************* HBase table " + tableName + " is not accessible");
LOG.error(StringUtils.stringifyException(e));
}
LOG.debug("Entered : " + this.getClass() + " : configure()");
useSalt = job.getBoolean(
String.format(HBaseConstants.USE_SALT, getTableName(job)), false);
prefixList = job.get(
String.format(HBaseConstants.SALT_PREFIX, getTableName(job)),
HBaseSalter.DEFAULT_PREFIX_LIST);
sourceMode = HBaseConstants.SourceMode.valueOf(job.get(String.format(
HBaseConstants.SOURCE_MODE, getTableName(job))));
LOG.info(String.format("GOT SOURCE MODE (%s) as (%s) and finally (%s)", String
.format(HBaseConstants.SOURCE_MODE, getTableName(job)), job
.get(String.format(HBaseConstants.SOURCE_MODE, getTableName(job))),
sourceMode));
switch (sourceMode) {
case SCAN_RANGE:
LOG.debug("HIT SCAN_RANGE");
startKey = getJobProp(job,
String.format(HBaseConstants.START_KEY, getTableName(job)));
stopKey = getJobProp(job,
String.format(HBaseConstants.STOP_KEY, getTableName(job)));
LOG.debug(String.format("Setting start key (%s) and stop key (%s)",
startKey, stopKey));
break;
case GET_LIST:
LOG.debug("HIT GET_LIST");
Collection<String> keys = job.getStringCollection(String.format(
HBaseConstants.KEY_LIST, getTableName(job)));
keyList = new TreeSet<String>(keys);
versions = job.getInt(
String.format(HBaseConstants.VERSIONS, getTableName(job)), 1);
LOG.debug("GOT KEY LIST : " + keys);
LOG.debug(String.format("SETTING key list (%s)", keyList));
break;
case EMPTY:
LOG.info("HIT EMPTY");
sourceMode = HBaseConstants.SourceMode.SCAN_ALL;
break;
default:
LOG.info("HIT DEFAULT");
break;
}
}
/* Getters & Setters */
protected HTable getHTable() {
return this.table;
}
protected void setHTable(HTable ht) {
this.table = ht;
}
protected void setInputColumns(byte[][] ic) {
this.inputColumns = ic;
}
protected void setJobProp(JobConf job, String key, String value) {
if (job.get(key) != null)
throw new RuntimeException(String.format(
"Job Conf already has key [%s] with value [%s]", key,
job.get(key)));
job.set(key, value);
}
protected String getJobProp(JobConf job, String key) {
return job.get(key);
}
public static void setTableName(JobConf job, String tableName) {
// Make sure that table has not been set before
String oldTableName = getTableName(job);
if (oldTableName != null) {
throw new RuntimeException("table name already set to: '"
+ oldTableName + "'");
}
job.set(INPUT_TABLE, tableName);
}
public static String getTableName(JobConf job) {
return job.get(INPUT_TABLE);
}
// protected void setParms(HBaseRecordReaderBase trr) {
// }
}
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