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HypertableClient.java
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Fri, May 17, 07:24

HypertableClient.java
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/**
* Licensed under the Apache License, Version 2.0 (the "License"); you
* may not use this file except in compliance with the License. You
* may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing
* permissions and limitations under the License. See accompanying
* LICENSE file.
*/
package com.yahoo.ycsb.db;
import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.Vector;
import org.apache.thrift.TException;
import org.hypertable.thrift.SerializedCellsFlag;
import org.hypertable.thrift.SerializedCellsWriter;
import org.hypertable.thrift.ThriftClient;
import org.hypertable.thriftgen.Cell;
import org.hypertable.thriftgen.ClientException;
import org.hypertable.thriftgen.Key;
import org.hypertable.thriftgen.KeyFlag;
import org.hypertable.thriftgen.RowInterval;
import org.hypertable.thriftgen.ScanSpec;
import org.hypertable.thrift.SerializedCellsReader;
import com.yahoo.ycsb.ByteArrayByteIterator;
import com.yahoo.ycsb.ByteIterator;
import com.yahoo.ycsb.DBException;
/**
* Hypertable client for YCSB framework
*/
public class HypertableClient extends com.yahoo.ycsb.DB
{
private boolean _debug = false;
private ThriftClient connection;
private long ns;
private String _columnFamily = "";
public static final int OK = 0;
public static final int SERVERERROR = -1;
public static final String NAMESPACE = "/ycsb";
public static final int THRIFTBROKER_PORT = 38080;
//TODO: make dynamic
public static final int BUFFER_SIZE = 4096;
/**
* Initialize any state for this DB.
* Called once per DB instance; there is one DB instance per client thread.
*/
@Override
public void init() throws DBException
{
if ( (getProperties().getProperty("debug") != null) &&
(getProperties().getProperty("debug").equals("true")) )
{
_debug = true;
}
try {
connection = ThriftClient.create("localhost", THRIFTBROKER_PORT);
if (!connection.namespace_exists(NAMESPACE)) {
connection.namespace_create(NAMESPACE);
}
ns = connection.open_namespace(NAMESPACE);
} catch (ClientException e) {
throw new DBException("Could not open namespace", e);
} catch (TException e) {
throw new DBException("Could not open namespace", e);
}
_columnFamily = getProperties().getProperty("columnfamily");
if (_columnFamily == null)
{
System.err.println("Error, must specify a " +
"columnfamily for Hypertable table");
throw new DBException("No columnfamily specified");
}
}
/**
* Cleanup any state for this DB.
* Called once per DB instance; there is one DB instance per client thread.
*/
@Override
public void cleanup() throws DBException
{
try {
connection.namespace_close(ns);
} catch (ClientException e) {
throw new DBException("Could not close namespace", e);
} catch (TException e) {
throw new DBException("Could not close namespace", e);
}
}
/**
* Read a record from the database. Each field/value pair from the result
* will be stored in a HashMap.
*
* @param table The name of the table
* @param key The record key of the record to read.
* @param fields The list of fields to read, or null for all of them
* @param result A HashMap of field/value pairs for the result
* @return Zero on success, a non-zero error code on error
*/
@Override
public int read(String table, String key, Set<String> fields,
HashMap<String, ByteIterator> result)
{
//SELECT _column_family:field[i]
// FROM table WHERE ROW=key MAX_VERSIONS 1;
if (_debug) {
System.out.println("Doing read from Hypertable columnfamily " +
_columnFamily);
System.out.println("Doing read for key: " + key);
}
try {
if (null != fields) {
Vector<HashMap<String, ByteIterator>> resMap =
new Vector<HashMap<String, ByteIterator>>();
if (0 != scan(table, key, 1, fields, resMap)) {
return SERVERERROR;
}
if (!resMap.isEmpty())
result.putAll(resMap.firstElement());
} else {
SerializedCellsReader reader = new SerializedCellsReader(null);
reader.reset(connection.get_row_serialized(ns, table, key));
while (reader.next()) {
result.put(new String(reader.get_column_qualifier()),
new ByteArrayByteIterator(reader.get_value()));
}
}
} catch (ClientException e) {
if (_debug) {
System.err.println("Error doing read: " + e.message);
}
return SERVERERROR;
} catch (TException e) {
if (_debug)
System.err.println("Error doing read");
return SERVERERROR;
}
return OK;
}
/**
* Perform a range scan for a set of records in the database. Each
* field/value pair from the result will be stored in a HashMap.
*
* @param table The name of the table
* @param startkey The record key of the first record to read.
* @param recordcount The number of records to read
* @param fields The list of fields to read, or null for all of them
* @param result A Vector of HashMaps, where each HashMap is a set
* field/value pairs for one record
* @return Zero on success, a non-zero error code on error
*/
@Override
public int scan(String table, String startkey, int recordcount,
Set<String> fields,
Vector<HashMap<String, ByteIterator>> result)
{
//SELECT _columnFamily:fields FROM table WHERE (ROW >= startkey)
// LIMIT recordcount MAX_VERSIONS 1;
ScanSpec spec = new ScanSpec();
RowInterval elem = new RowInterval();
elem.setStart_inclusive(true);
elem.setStart_row(startkey);
spec.addToRow_intervals(elem);
if (null != fields) {
for (String field : fields) {
spec.addToColumns(_columnFamily + ":" + field);
}
}
spec.setVersions(1);
spec.setRow_limit(recordcount);
SerializedCellsReader reader = new SerializedCellsReader(null);
try {
long sc = connection.scanner_open(ns, table, spec);
String lastRow = null;
boolean eos = false;
while (!eos) {
reader.reset(connection.scanner_get_cells_serialized(sc));
while (reader.next()) {
String currentRow = new String(reader.get_row());
if (!currentRow.equals(lastRow)) {
result.add(new HashMap<String, ByteIterator>());
lastRow = currentRow;
}
result.lastElement().put(
new String(reader.get_column_qualifier()),
new ByteArrayByteIterator(reader.get_value()));
}
eos = reader.eos();
if (_debug) {
System.out.println("Number of rows retrieved so far: " +
result.size());
}
}
connection.scanner_close(sc);
} catch (ClientException e) {
if (_debug) {
System.err.println("Error doing scan: " + e.message);
}
return SERVERERROR;
} catch (TException e) {
if (_debug)
System.err.println("Error doing scan");
return SERVERERROR;
}
return OK;
}
/**
* Update a record in the database. Any field/value pairs in the specified
* values HashMap will be written into the record with the specified
* record key, overwriting any existing values with the same field name.
*
* @param table The name of the table
* @param key The record key of the record to write
* @param values A HashMap of field/value pairs to update in the record
* @return Zero on success, a non-zero error code on error
*/
@Override
public int update(String table, String key,
HashMap<String, ByteIterator> values)
{
return insert(table, key, values);
}
/**
* Insert a record in the database. Any field/value pairs in the specified
* values HashMap will be written into the record with the specified
* record key.
*
* @param table The name of the table
* @param key The record key of the record to insert.
* @param values A HashMap of field/value pairs to insert in the record
* @return Zero on success, a non-zero error code on error
*/
@Override
public int insert(String table, String key,
HashMap<String, ByteIterator> values)
{
//INSERT INTO table VALUES
// (key, _column_family:entry,getKey(), entry.getValue()), (...);
if (_debug) {
System.out.println("Setting up put for key: " + key);
}
try {
long mutator = connection.mutator_open(ns, table, 0, 0);
SerializedCellsWriter writer =
new SerializedCellsWriter(BUFFER_SIZE*values.size(), true);
for (Map.Entry<String, ByteIterator> entry : values.entrySet()) {
writer.add(key, _columnFamily, entry.getKey(),
SerializedCellsFlag.AUTO_ASSIGN,
ByteBuffer.wrap(entry.getValue().toArray()));
}
connection.mutator_set_cells_serialized(mutator,
writer.buffer(), true);
connection.mutator_close(mutator);
} catch (ClientException e) {
if (_debug) {
System.err.println("Error doing set: " + e.message);
}
return SERVERERROR;
} catch (TException e) {
if (_debug)
System.err.println("Error doing set");
return SERVERERROR;
}
return OK;
}
/**
* Delete a record from the database.
*
* @param table The name of the table
* @param key The record key of the record to delete.
* @return Zero on success, a non-zero error code on error
*/
@Override
public int delete(String table, String key)
{
//DELETE * FROM table WHERE ROW=key;
if (_debug) {
System.out.println("Doing delete for key: "+key);
}
Cell entry = new Cell();
entry.key = new Key();
entry.key.row = key;
entry.key.flag = KeyFlag.DELETE_ROW;
try {
connection.set_cell(ns, table, entry);
} catch (ClientException e) {
if (_debug) {
System.err.println("Error doing delete: " + e.message);
}
return SERVERERROR;
} catch (TException e) {
if (_debug)
System.err.println("Error doing delete");
return SERVERERROR;
}
return OK;
}
}

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