/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
package org.apache.cassandra.hadoop.pig;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.charset.CharacterCodingException;
import java.util.*;
import org.apache.cassandra.hadoop.HadoopCompat;
import org.apache.cassandra.db.Cell;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.db.marshal.*;
import org.apache.cassandra.exceptions.ConfigurationException;
import org.apache.cassandra.exceptions.InvalidRequestException;
import org.apache.cassandra.hadoop.*;
import org.apache.cassandra.thrift.*;
import org.apache.cassandra.utils.ByteBufferUtil;
import org.apache.cassandra.utils.FBUtilities;
import org.apache.cassandra.utils.Hex;
import org.apache.hadoop.mapreduce.*;
import org.apache.pig.Expression;
import org.apache.pig.ResourceSchema;
import org.apache.pig.ResourceSchema.ResourceFieldSchema;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigSplit;
import org.apache.pig.data.*;
import org.apache.pig.impl.util.UDFContext;
import org.apache.thrift.TDeserializer;
import org.apache.thrift.TException;
import org.apache.thrift.TSerializer;
import org.apache.thrift.protocol.TBinaryProtocol;
/**
* A LoadStoreFunc for retrieving data from and storing data to Cassandra
*
* A row from a standard CF will be returned as nested tuples: (key, ((name1, val1), (name2, val2))).
*/
public class CassandraStorage extends AbstractCassandraStorage
{
public final static String PIG_ALLOW_DELETES = "PIG_ALLOW_DELETES";
public final static String PIG_WIDEROW_INPUT = "PIG_WIDEROW_INPUT";
public final static String PIG_USE_SECONDARY = "PIG_USE_SECONDARY";
private final static ByteBuffer BOUND = ByteBufferUtil.EMPTY_BYTE_BUFFER;
private static final Logger logger = LoggerFactory.getLogger(CassandraStorage.class);
private ByteBuffer slice_start = BOUND;
private ByteBuffer slice_end = BOUND;
private boolean slice_reverse = false;
private boolean allow_deletes = false;
private RecordReader<ByteBuffer, Map<ByteBuffer, Cell>> reader;
private RecordWriter<ByteBuffer, List<Mutation>> writer;
private boolean widerows = false;
private int limit;
// wide row hacks
private ByteBuffer lastKey;
private Map<ByteBuffer, Cell> lastRow;
private boolean hasNext = true;
public CassandraStorage()
{
this(1024);
}
/**@param limit number of columns to fetch in a slice */
public CassandraStorage(int limit)
{
super();
this.limit = limit;
DEFAULT_INPUT_FORMAT = "org.apache.cassandra.hadoop.ColumnFamilyInputFormat";
DEFAULT_OUTPUT_FORMAT = "org.apache.cassandra.hadoop.ColumnFamilyOutputFormat";
}
public int getLimit()
{
return limit;
}
public void prepareToRead(RecordReader reader, PigSplit split)
{
this.reader = reader;
}
/** read wide row*/
public Tuple getNextWide() throws IOException
{
CfInfo cfInfo = getCfInfo(loadSignature);
CfDef cfDef = cfInfo.cfDef;
ByteBuffer key = null;
Tuple tuple = null;
DefaultDataBag bag = new DefaultDataBag();
try
{
while(true)
{
hasNext = reader.nextKeyValue();
if (!hasNext)
{
if (tuple == null)
tuple = TupleFactory.getInstance().newTuple();
if (lastRow != null)
{
if (tuple.size() == 0) // lastRow is a new one
{
key = (ByteBuffer)reader.getCurrentKey();
tuple = keyToTuple(key, cfDef, parseType(cfDef.getKey_validation_class()));
}
for (Map.Entry<ByteBuffer, Cell> entry : lastRow.entrySet())
{
bag.add(columnToTuple(entry.getValue(), cfInfo, parseType(cfDef.getComparator_type())));
}
lastKey = null;
lastRow = null;
tuple.append(bag);
return tuple;
}
else
{
if (tuple.size() == 1) // rare case of just one wide row, key already set
{
tuple.append(bag);
return tuple;
}
else
return null;
}
}
if (key != null && !((ByteBuffer)reader.getCurrentKey()).equals(key)) // key changed
{
// read too much, hold on to it for next time
lastKey = (ByteBuffer)reader.getCurrentKey();
lastRow = (SortedMap<ByteBuffer, Cell>)reader.getCurrentValue();
// but return what we have so far
tuple.append(bag);
return tuple;
}
if (key == null) // only set the key on the first iteration
{
key = (ByteBuffer)reader.getCurrentKey();
if (lastKey != null && !(key.equals(lastKey))) // last key only had one value
{
if (tuple == null)
tuple = keyToTuple(lastKey, cfDef, parseType(cfDef.getKey_validation_class()));
else
addKeyToTuple(tuple, lastKey, cfDef, parseType(cfDef.getKey_validation_class()));
for (Map.Entry<ByteBuffer, Cell> entry : lastRow.entrySet())
{
bag.add(columnToTuple(entry.getValue(), cfInfo, parseType(cfDef.getComparator_type())));
}
tuple.append(bag);
lastKey = key;
lastRow = (SortedMap<ByteBuffer, Cell>)reader.getCurrentValue();
return tuple;
}
if (tuple == null)
tuple = keyToTuple(key, cfDef, parseType(cfDef.getKey_validation_class()));
else
addKeyToTuple(tuple, lastKey, cfDef, parseType(cfDef.getKey_validation_class()));
}
SortedMap<ByteBuffer, Cell> row = (SortedMap<ByteBuffer, Cell>)reader.getCurrentValue();
if (lastRow != null) // prepend what was read last time
{
for (Map.Entry<ByteBuffer, Cell> entry : lastRow.entrySet())
{
bag.add(columnToTuple(entry.getValue(), cfInfo, parseType(cfDef.getComparator_type())));
}
lastKey = null;
lastRow = null;
}
for (Map.Entry<ByteBuffer, Cell> entry : row.entrySet())
{
bag.add(columnToTuple(entry.getValue(), cfInfo, parseType(cfDef.getComparator_type())));
}
}
}
catch (InterruptedException e)
{
throw new IOException(e.getMessage());
}
}
@Override
/** read next row */
public Tuple getNext() throws IOException
{
if (widerows)
return getNextWide();
try
{
// load the next pair
if (!reader.nextKeyValue())
return null;
CfInfo cfInfo = getCfInfo(loadSignature);
CfDef cfDef = cfInfo.cfDef;
ByteBuffer key = reader.getCurrentKey();
Map<ByteBuffer, Cell> cf = reader.getCurrentValue();
assert key != null && cf != null;
// output tuple, will hold the key, each indexed column in a tuple, then a bag of the rest
// NOTE: we're setting the tuple size here only for the key so we can use setTupleValue on it
Tuple tuple = keyToTuple(key, cfDef, parseType(cfDef.getKey_validation_class()));
DefaultDataBag bag = new DefaultDataBag();
// we must add all the indexed columns first to match the schema
Map<ByteBuffer, Boolean> added = new HashMap<ByteBuffer, Boolean>();
// take care to iterate these in the same order as the schema does
for (ColumnDef cdef : cfDef.column_metadata)
{
boolean hasColumn = false;
boolean cql3Table = false;
try
{
hasColumn = cf.containsKey(cdef.name);
}
catch (Exception e)
{
cql3Table = true;
}
if (hasColumn)
{
tuple.append(columnToTuple(cf.get(cdef.name), cfInfo, parseType(cfDef.getComparator_type())));
}
else if (!cql3Table)
{ // otherwise, we need to add an empty tuple to take its place
tuple.append(TupleFactory.getInstance().newTuple());
}
added.put(cdef.name, true);
}
// now add all the other columns
for (Map.Entry<ByteBuffer, Cell> entry : cf.entrySet())
{
if (!added.containsKey(entry.getKey()))
bag.add(columnToTuple(entry.getValue(), cfInfo, parseType(cfDef.getComparator_type())));
}
tuple.append(bag);
// finally, special top-level indexes if needed
if (usePartitionFilter)
{
for (ColumnDef cdef : getIndexes())
{
Tuple throwaway = columnToTuple(cf.get(cdef.name), cfInfo, parseType(cfDef.getComparator_type()));
tuple.append(throwaway.get(1));
}
}
return tuple;
}
catch (InterruptedException e)
{
throw new IOException(e.getMessage());
}
}
/** set hadoop cassandra connection settings */
protected void setConnectionInformation() throws IOException
{
super.setConnectionInformation();
if (System.getenv(PIG_ALLOW_DELETES) != null)
allow_deletes = Boolean.parseBoolean(System.getenv(PIG_ALLOW_DELETES));
}
/** set read configuration settings */
public void setLocation(String location, Job job) throws IOException
{
conf = HadoopCompat.getConfiguration(job);
setLocationFromUri(location);
if (ConfigHelper.getInputSlicePredicate(conf) == null)
{
SliceRange range = new SliceRange(slice_start, slice_end, slice_reverse, limit);
SlicePredicate predicate = new SlicePredicate().setSlice_range(range);
ConfigHelper.setInputSlicePredicate(conf, predicate);
}
if (System.getenv(PIG_WIDEROW_INPUT) != null)
widerows = Boolean.parseBoolean(System.getenv(PIG_WIDEROW_INPUT));
if (System.getenv(PIG_USE_SECONDARY) != null)
usePartitionFilter = Boolean.parseBoolean(System.getenv(PIG_USE_SECONDARY));
if (System.getenv(PIG_INPUT_SPLIT_SIZE) != null)
{
try
{
ConfigHelper.setInputSplitSize(conf, Integer.parseInt(System.getenv(PIG_INPUT_SPLIT_SIZE)));
}
catch (NumberFormatException e)
{
throw new IOException("PIG_INPUT_SPLIT_SIZE is not a number", e);
}
}
if (usePartitionFilter && getIndexExpressions() != null)
ConfigHelper.setInputRange(conf, getIndexExpressions());
if (username != null && password != null)
ConfigHelper.setInputKeyspaceUserNameAndPassword(conf, username, password);
if (splitSize > 0)
ConfigHelper.setInputSplitSize(conf, splitSize);
if (partitionerClass!= null)
ConfigHelper.setInputPartitioner(conf, partitionerClass);
if (rpcPort != null)
ConfigHelper.setInputRpcPort(conf, rpcPort);
if (initHostAddress != null)
ConfigHelper.setInputInitialAddress(conf, initHostAddress);
ConfigHelper.setInputColumnFamily(conf, keyspace, column_family, widerows);
setConnectionInformation();
if (ConfigHelper.getInputRpcPort(conf) == 0)
throw new IOException("PIG_INPUT_RPC_PORT or PIG_RPC_PORT environment variable not set");
if (ConfigHelper.getInputInitialAddress(conf) == null)
throw new IOException("PIG_INPUT_INITIAL_ADDRESS or PIG_INITIAL_ADDRESS environment variable not set");
if (ConfigHelper.getInputPartitioner(conf) == null)
throw new IOException("PIG_INPUT_PARTITIONER or PIG_PARTITIONER environment variable not set");
if (loadSignature == null)
loadSignature = location;
initSchema(loadSignature);
}
/** set store configuration settings */
public void setStoreLocation(String location, Job job) throws IOException
{
conf = HadoopCompat.getConfiguration(job);
// don't combine mappers to a single mapper per node
conf.setBoolean("pig.noSplitCombination", true);
setLocationFromUri(location);
if (username != null && password != null)
ConfigHelper.setOutputKeyspaceUserNameAndPassword(conf, username, password);
if (splitSize > 0)
ConfigHelper.setInputSplitSize(conf, splitSize);
if (partitionerClass!= null)
ConfigHelper.setOutputPartitioner(conf, partitionerClass);
if (rpcPort != null)
{
ConfigHelper.setOutputRpcPort(conf, rpcPort);
ConfigHelper.setInputRpcPort(conf, rpcPort);
}
if (initHostAddress != null)
{
ConfigHelper.setOutputInitialAddress(conf, initHostAddress);
ConfigHelper.setInputInitialAddress(conf, initHostAddress);
}
ConfigHelper.setOutputColumnFamily(conf, keyspace, column_family);
setConnectionInformation();
if (ConfigHelper.getOutputRpcPort(conf) == 0)
throw new IOException("PIG_OUTPUT_RPC_PORT or PIG_RPC_PORT environment variable not set");
if (ConfigHelper.getOutputInitialAddress(conf) == null)
throw new IOException("PIG_OUTPUT_INITIAL_ADDRESS or PIG_INITIAL_ADDRESS environment variable not set");
if (ConfigHelper.getOutputPartitioner(conf) == null)
throw new IOException("PIG_OUTPUT_PARTITIONER or PIG_PARTITIONER environment variable not set");
// we have to do this again here for the check in writeColumnsFromTuple
if (System.getenv(PIG_USE_SECONDARY) != null)
usePartitionFilter = Boolean.parseBoolean(System.getenv(PIG_USE_SECONDARY));
initSchema(storeSignature);
}
/** define the schema */
public ResourceSchema getSchema(String location, Job job) throws IOException
{
setLocation(location, job);
CfInfo cfInfo = getCfInfo(loadSignature);
CfDef cfDef = cfInfo.cfDef;
if (cfDef.column_type.equals("Super"))
return null;
/*
Our returned schema should look like this:
(key, index1:(name, value), index2:(name, value), columns:{(name, value)})
Which is to say, columns that have metadata will be returned as named tuples, but unknown columns will go into a bag.
This way, wide rows can still be handled by the bag, but known columns can easily be referenced.
*/
// top-level schema, no type
ResourceSchema schema = new ResourceSchema();
// get default marshallers and validators
Map<MarshallerType, AbstractType> marshallers = getDefaultMarshallers(cfDef);
Map<ByteBuffer,AbstractType> validators = getValidatorMap(cfDef);
// add key
ResourceFieldSchema keyFieldSchema = new ResourceFieldSchema();
keyFieldSchema.setName("key");
keyFieldSchema.setType(getPigType(marshallers.get(MarshallerType.KEY_VALIDATOR)));
ResourceSchema bagSchema = new ResourceSchema();
ResourceFieldSchema bagField = new ResourceFieldSchema();
bagField.setType(DataType.BAG);
bagField.setName("columns");
// inside the bag, place one tuple with the default comparator/validator schema
ResourceSchema bagTupleSchema = new ResourceSchema();
ResourceFieldSchema bagTupleField = new ResourceFieldSchema();
bagTupleField.setType(DataType.TUPLE);
ResourceFieldSchema bagcolSchema = new ResourceFieldSchema();
ResourceFieldSchema bagvalSchema = new ResourceFieldSchema();
bagcolSchema.setName("name");
bagvalSchema.setName("value");
bagcolSchema.setType(getPigType(marshallers.get(MarshallerType.COMPARATOR)));
bagvalSchema.setType(getPigType(marshallers.get(MarshallerType.DEFAULT_VALIDATOR)));
bagTupleSchema.setFields(new ResourceFieldSchema[] { bagcolSchema, bagvalSchema });
bagTupleField.setSchema(bagTupleSchema);
bagSchema.setFields(new ResourceFieldSchema[] { bagTupleField });
bagField.setSchema(bagSchema);
// will contain all fields for this schema
List<ResourceFieldSchema> allSchemaFields = new ArrayList<ResourceFieldSchema>();
// add the key first, then the indexed columns, and finally the bag
allSchemaFields.add(keyFieldSchema);
if (!widerows && (cfInfo.compactCqlTable || !cfInfo.cql3Table))
{
// defined validators/indexes
for (ColumnDef cdef : cfDef.column_metadata)
{
// make a new tuple for each col/val pair
ResourceSchema innerTupleSchema = new ResourceSchema();
ResourceFieldSchema innerTupleField = new ResourceFieldSchema();
innerTupleField.setType(DataType.TUPLE);
innerTupleField.setSchema(innerTupleSchema);
innerTupleField.setName(new String(cdef.getName()));
ResourceFieldSchema idxColSchema = new ResourceFieldSchema();
idxColSchema.setName("name");
idxColSchema.setType(getPigType(marshallers.get(MarshallerType.COMPARATOR)));
ResourceFieldSchema valSchema = new ResourceFieldSchema();
AbstractType validator = validators.get(cdef.name);
if (validator == null)
validator = marshallers.get(MarshallerType.DEFAULT_VALIDATOR);
valSchema.setName("value");
valSchema.setType(getPigType(validator));
innerTupleSchema.setFields(new ResourceFieldSchema[] { idxColSchema, valSchema });
allSchemaFields.add(innerTupleField);
}
}
// bag at the end for unknown columns
allSchemaFields.add(bagField);
// add top-level index elements if needed
if (usePartitionFilter)
{
for (ColumnDef cdef : getIndexes())
{
ResourceFieldSchema idxSchema = new ResourceFieldSchema();
idxSchema.setName("index_" + new String(cdef.getName()));
AbstractType validator = validators.get(cdef.name);
if (validator == null)
validator = marshallers.get(MarshallerType.DEFAULT_VALIDATOR);
idxSchema.setType(getPigType(validator));
allSchemaFields.add(idxSchema);
}
}
// top level schema contains everything
schema.setFields(allSchemaFields.toArray(new ResourceFieldSchema[allSchemaFields.size()]));
return schema;
}
/** set partition filter */
public void setPartitionFilter(Expression partitionFilter) throws IOException
{
UDFContext context = UDFContext.getUDFContext();
Properties property = context.getUDFProperties(AbstractCassandraStorage.class);
property.setProperty(PARTITION_FILTER_SIGNATURE, indexExpressionsToString(filterToIndexExpressions(partitionFilter)));
}
/** prepare writer */
public void prepareToWrite(RecordWriter writer)
{
this.writer = writer;
}
/** write next row */
public void putNext(Tuple t) throws IOException
{
/*
We support two cases for output:
First, the original output:
(key, (name, value), (name,value), {(name,value)}) (tuples or bag is optional)
For supers, we only accept the original output.
*/
if (t.size() < 1)
{
// simply nothing here, we can't even delete without a key
logger.warn("Empty output skipped, filter empty tuples to suppress this warning");
return;
}
ByteBuffer key = objToBB(t.get(0));
if (t.getType(1) == DataType.TUPLE)
writeColumnsFromTuple(key, t, 1);
else if (t.getType(1) == DataType.BAG)
{
if (t.size() > 2)
throw new IOException("No arguments allowed after bag");
writeColumnsFromBag(key, (DataBag) t.get(1));
}
else
throw new IOException("Second argument in output must be a tuple or bag");
}
/** write tuple data to cassandra */
private void writeColumnsFromTuple(ByteBuffer key, Tuple t, int offset) throws IOException
{
ArrayList<Mutation> mutationList = new ArrayList<Mutation>();
for (int i = offset; i < t.size(); i++)
{
if (t.getType(i) == DataType.BAG)
writeColumnsFromBag(key, (DataBag) t.get(i));
else if (t.getType(i) == DataType.TUPLE)
{
Tuple inner = (Tuple) t.get(i);
if (inner.size() > 0) // may be empty, for an indexed column that wasn't present
mutationList.add(mutationFromTuple(inner));
}
else if (!usePartitionFilter)
{
throw new IOException("Output type was not a bag or a tuple");
}
}
if (mutationList.size() > 0)
writeMutations(key, mutationList);
}
/** compose Cassandra mutation from tuple */
private Mutation mutationFromTuple(Tuple t) throws IOException
{
Mutation mutation = new Mutation();
if (t.get(1) == null)
{
if (allow_deletes)
{
mutation.deletion = new Deletion();
mutation.deletion.predicate = new org.apache.cassandra.thrift.SlicePredicate();
mutation.deletion.predicate.column_names = Arrays.asList(objToBB(t.get(0)));
mutation.deletion.setTimestamp(FBUtilities.timestampMicros());
}
else
throw new IOException("null found but deletes are disabled, set " + PIG_ALLOW_DELETES +
"=true in environment or allow_deletes=true in URL to enable");
}
else
{
org.apache.cassandra.thrift.Column column = new org.apache.cassandra.thrift.Column();
column.setName(objToBB(t.get(0)));
column.setValue(objToBB(t.get(1)));
column.setTimestamp(FBUtilities.timestampMicros());
mutation.column_or_supercolumn = new ColumnOrSuperColumn();
mutation.column_or_supercolumn.column = column;
}
return mutation;
}
/** write bag data to Cassandra */
private void writeColumnsFromBag(ByteBuffer key, DataBag bag) throws IOException
{
List<Mutation> mutationList = new ArrayList<Mutation>();
for (Tuple pair : bag)
{
Mutation mutation = new Mutation();
if (DataType.findType(pair.get(1)) == DataType.BAG) // supercolumn
{
SuperColumn sc = new SuperColumn();
sc.setName(objToBB(pair.get(0)));
List<org.apache.cassandra.thrift.Column> columns = new ArrayList<org.apache.cassandra.thrift.Column>();
for (Tuple subcol : (DataBag) pair.get(1))
{
org.apache.cassandra.thrift.Column column = new org.apache.cassandra.thrift.Column();
column.setName(objToBB(subcol.get(0)));
column.setValue(objToBB(subcol.get(1)));
column.setTimestamp(FBUtilities.timestampMicros());
columns.add(column);
}
if (columns.isEmpty())
{
if (allow_deletes)
{
mutation.deletion = new Deletion();
mutation.deletion.super_column = objToBB(pair.get(0));
mutation.deletion.setTimestamp(FBUtilities.timestampMicros());
}
else
throw new IOException("SuperColumn deletion attempted with empty bag, but deletes are disabled, set " +
PIG_ALLOW_DELETES + "=true in environment or allow_deletes=true in URL to enable");
}
else
{
sc.columns = columns;
mutation.column_or_supercolumn = new ColumnOrSuperColumn();
mutation.column_or_supercolumn.super_column = sc;
}
}
else
mutation = mutationFromTuple(pair);
mutationList.add(mutation);
// for wide rows, we need to limit the amount of mutations we write at once
if (mutationList.size() >= 10) // arbitrary, CFOF will re-batch this up, and BOF won't care
{
writeMutations(key, mutationList);
mutationList.clear();
}
}
// write the last batch
if (mutationList.size() > 0)
writeMutations(key, mutationList);
}
/** write mutation to Cassandra */
private void writeMutations(ByteBuffer key, List<Mutation> mutations) throws IOException
{
try
{
writer.write(key, mutations);
}
catch (InterruptedException e)
{
throw new IOException(e);
}
}
/** get a list of Cassandra IndexExpression from Pig expression */
private List<IndexExpression> filterToIndexExpressions(Expression expression) throws IOException
{
List<IndexExpression> indexExpressions = new ArrayList<IndexExpression>();
Expression.BinaryExpression be = (Expression.BinaryExpression)expression;
ByteBuffer name = ByteBuffer.wrap(be.getLhs().toString().getBytes());
ByteBuffer value = ByteBuffer.wrap(be.getRhs().toString().getBytes());
switch (expression.getOpType())
{
case OP_EQ:
indexExpressions.add(new IndexExpression(name, IndexOperator.EQ, value));
break;
case OP_GE:
indexExpressions.add(new IndexExpression(name, IndexOperator.GTE, value));
break;
case OP_GT:
indexExpressions.add(new IndexExpression(name, IndexOperator.GT, value));
break;
case OP_LE:
indexExpressions.add(new IndexExpression(name, IndexOperator.LTE, value));
break;
case OP_LT:
indexExpressions.add(new IndexExpression(name, IndexOperator.LT, value));
break;
case OP_AND:
indexExpressions.addAll(filterToIndexExpressions(be.getLhs()));
indexExpressions.addAll(filterToIndexExpressions(be.getRhs()));
break;
default:
throw new IOException("Unsupported expression type: " + expression.getOpType().name());
}
return indexExpressions;
}
/** convert a list of index expression to string */
private static String indexExpressionsToString(List<IndexExpression> indexExpressions) throws IOException
{
assert indexExpressions != null;
// oh, you thought cfdefToString was awful?
IndexClause indexClause = new IndexClause();
indexClause.setExpressions(indexExpressions);
indexClause.setStart_key("".getBytes());
TSerializer serializer = new TSerializer(new TBinaryProtocol.Factory());
try
{
return Hex.bytesToHex(serializer.serialize(indexClause));
}
catch (TException e)
{
throw new IOException(e);
}
}
/** convert string to a list of index expression */
private static List<IndexExpression> indexExpressionsFromString(String ie) throws IOException
{
assert ie != null;
TDeserializer deserializer = new TDeserializer(new TBinaryProtocol.Factory());
IndexClause indexClause = new IndexClause();
try
{
deserializer.deserialize(indexClause, Hex.hexToBytes(ie));
}
catch (TException e)
{
throw new IOException(e);
}
return indexClause.getExpressions();
}
/** get a list of index expression */
private List<IndexExpression> getIndexExpressions() throws IOException
{
UDFContext context = UDFContext.getUDFContext();
Properties property = context.getUDFProperties(AbstractCassandraStorage.class);
if (property.getProperty(PARTITION_FILTER_SIGNATURE) != null)
return indexExpressionsFromString(property.getProperty(PARTITION_FILTER_SIGNATURE));
else
return null;
}
/** get a list of column for the column family */
protected List<ColumnDef> getColumnMetadata(Cassandra.Client client)
throws TException, CharacterCodingException, InvalidRequestException, ConfigurationException
{
return getColumnMeta(client, true, true);
}
/** convert key to a tuple */
private Tuple keyToTuple(ByteBuffer key, CfDef cfDef, AbstractType comparator) throws IOException
{
Tuple tuple = TupleFactory.getInstance().newTuple(1);
addKeyToTuple(tuple, key, cfDef, comparator);
return tuple;
}
/** add key to a tuple */
private void addKeyToTuple(Tuple tuple, ByteBuffer key, CfDef cfDef, AbstractType comparator) throws IOException
{
if( comparator instanceof AbstractCompositeType )
{
setTupleValue(tuple, 0, composeComposite((AbstractCompositeType)comparator,key));
}
else
{
setTupleValue(tuple, 0, cassandraToObj(getDefaultMarshallers(cfDef).get(MarshallerType.KEY_VALIDATOR), key));
}
}
/** cassandra://[username:password@]<keyspace>/<columnfamily>[?slice_start=<start>&slice_end=<end>
* [&reversed=true][&limit=1][&allow_deletes=true][&widerows=true]
* [&use_secondary=true][&comparator=<comparator>][&partitioner=<partitioner>]]*/
private void setLocationFromUri(String location) throws IOException
{
try
{
if (!location.startsWith("cassandra://"))
throw new Exception("Bad scheme." + location);
String[] urlParts = location.split("\\?");
if (urlParts.length > 1)
{
Map<String, String> urlQuery = getQueryMap(urlParts[1]);
AbstractType comparator = BytesType.instance;
if (urlQuery.containsKey("comparator"))
comparator = TypeParser.parse(urlQuery.get("comparator"));
if (urlQuery.containsKey("slice_start"))
slice_start = comparator.fromString(urlQuery.get("slice_start"));
if (urlQuery.containsKey("slice_end"))
slice_end = comparator.fromString(urlQuery.get("slice_end"));
if (urlQuery.containsKey("reversed"))
slice_reverse = Boolean.parseBoolean(urlQuery.get("reversed"));
if (urlQuery.containsKey("limit"))
limit = Integer.parseInt(urlQuery.get("limit"));
if (urlQuery.containsKey("allow_deletes"))
allow_deletes = Boolean.parseBoolean(urlQuery.get("allow_deletes"));
if (urlQuery.containsKey("widerows"))
widerows = Boolean.parseBoolean(urlQuery.get("widerows"));
if (urlQuery.containsKey("use_secondary"))
usePartitionFilter = Boolean.parseBoolean(urlQuery.get("use_secondary"));
if (urlQuery.containsKey("split_size"))
splitSize = Integer.parseInt(urlQuery.get("split_size"));
if (urlQuery.containsKey("partitioner"))
partitionerClass = urlQuery.get("partitioner");
if (urlQuery.containsKey("init_address"))
initHostAddress = urlQuery.get("init_address");
if (urlQuery.containsKey("rpc_port"))
rpcPort = urlQuery.get("rpc_port");
}
String[] parts = urlParts[0].split("/+");
String[] credentialsAndKeyspace = parts[1].split("@");
if (credentialsAndKeyspace.length > 1)
{
String[] credentials = credentialsAndKeyspace[0].split(":");
username = credentials[0];
password = credentials[1];
keyspace = credentialsAndKeyspace[1];
}
else
{
keyspace = parts[1];
}
column_family = parts[2];
}
catch (Exception e)
{
throw new IOException("Expected 'cassandra://[username:password@]<keyspace>/<columnfamily>" +
"[?slice_start=<start>&slice_end=<end>[&reversed=true][&limit=1]" +
"[&allow_deletes=true][&widerows=true][&use_secondary=true]" +
"[&comparator=<comparator>][&split_size=<size>][&partitioner=<partitioner>]" +
"[&init_address=<host>][&rpc_port=<port>]]': " + e.getMessage());
}
}
public ByteBuffer nullToBB()
{
return (ByteBuffer) null;
}
}