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Cassandra SF 2013 - Cassandra Internals
1.
CASSANDRA SF 2013 CASSANDRA INTERNALS Aaron
Morton @aaronmorton www.thelastpickle.com #Cassandra13 Licensed under a Creative Commons Attribution-NonCommercial 3.0 New Zealand License
2.
About Me Freelance Cassandra
Consultant Based in Wellington, New Zealand Apache Cassandra Committer #Cassandra13
3.
Architecture Code #Cassandra13
4.
Cassandra Architecture API's Cluster Aware Cluster
Unaware Clients Disk #Cassandra13
5.
Cassandra Cluster Architecture API's Cluster
Aware Cluster Unaware Clients Disk API's Cluster Aware Cluster Unaware Disk Node 1 Node 2 #Cassandra13
6.
Dynamo Cluster Architecture API's Dynamo Database Clients Disk API's Dynamo Database Disk Node
1 Node 2 #Cassandra13
7.
Architecture API Dynamo Database #Cassandra13
8.
APITransports Thrift Native Binary #Cassandra13
9.
ThriftTransport //Custom TServer implementations o.a.c.thrift.CustomTThreadPoolServer o.a.c.thrift.CustomTNonBlockingServer o.a.c.thrift.CustomTHsHaServer #Cassandra13
10.
APITransports Thrift Native Binary #Cassandra13
11.
Native BinaryTransport Beta in
Cassandra 1.2 Uses Netty Enabled with start_native_transport (Disabled by default) #Cassandra13
12.
o.a.c.transport.Server.run() //Setup the Netty
server new ExecutionHandler() new NioServerSocketChannelFactory() ServerBootstrap.setPipelineFactory() #Cassandra13
13.
o.a.c.transport.Message.Dispatcher.messageReceived() //Process message from
client ServerConnection.validateNewMessage() Request.execute() ServerConnection.applyStateTransition() Channel.write() #Cassandra13
14.
Messages Defined in the
Native Binary Protocol $SRC/doc/native_protocol.spec #Cassandra13
15.
API Services JMX Thrift CQL 3 #Cassandra13
16.
JMX Management Beans Spread
around the code base. Interfaces named *MBean #Cassandra13
17.
JMX Management Beans Registered
with names such as org.apache.cassandra.db: type=StorageProxy #Cassandra13
18.
API Services JMX Thrift CQL 3 #Cassandra13
19.
o.a.c.thrift.CassandraServer // Implements Thrift
Interface // Access control // Input validation // Mapping to/from Thrift and internal types #Cassandra13
20.
Thrift Interface Thrift IDL $SRC/interface/cassandra.thrift #Cassandra13
21.
o.a.c.thrift.CassandraServer.get_slice() // get columns
for one row Tracing.begin() ClientState cState = state() cState.hasColumnFamilyAccess() multigetSliceInternal() #Cassandra13
22.
CassandraServer.multigetSliceInternal() // get columns
for may rows ThriftValidation.validate*() // Create ReadCommands getSlice() #Cassandra13
23.
CassandraServer.getSlice() // Process ReadCommands //
return Thrift types readColumnFamily() thriftifyColumnFamily() #Cassandra13
24.
CassandraServer.readColumnFamily() // Process ReadCommands //
Return ColumnFamilies StorageProxy.read() #Cassandra13
25.
API Services JMX Thrift CQL 3 #Cassandra13
26.
o.a.c.cql3.QueryProcessor // Prepares and
executes CQL3 statements // Used by Thrift & Native transports // Access control // Input validation // Returns transport.ResultMessage #Cassandra13
27.
CQL3 Grammar ANTLR Grammar $SRC/o.a.c.cql3/Cql.g #Cassandra13
28.
o.a.c.cql3.statements.ParsedStatement // Subclasses generated
by ANTLR // Tracks bound term count // Prepare CQLStatement prepare() #Cassandra13
29.
o.a.c.cql3.statements.CQLStatement checkAccess(ClientState state) validate(ClientState state) execute(ConsistencyLevel
cl, QueryState state, List<ByteBuffer> variables) #Cassandra13
30.
statements.SelectStatement.RawStatement // Implements ParsedStatement //
Input validation prepare() #Cassandra13
31.
statements.SelectStatement.execute() // Create ReadCommands StorageProxy.read() #Cassandra13
32.
Architecture API Dynamo Database #Cassandra13
33.
Dynamo Layer o.a.c.service o.a.c.net o.a.c.dht o.a.c.gms o.a.c.locator o.a.c.stream #Cassandra13
34.
o.a.c.service.StorageProxy // Cluster wide
storage operations // Select endpoints & check CL available // Send messages to Stages // Wait for response // Store Hints #Cassandra13
35.
o.a.c.service.StorageService // Ring operations //
Track ring state // Start & stop ring membership // Node & token queries #Cassandra13
36.
o.a.c.service.IResponseResolver preprocess(MessageIn<T> message) resolve() throws DigestMismatchException RowDigestResolver RowDataResolver RangeSliceResponseResolver #Cassandra13
37.
Response Handlers /
Callback implements IAsyncCallback<T> response(MessageIn<T> msg) #Cassandra13
38.
o.a.c.service.ReadCallback.get() //Wait for blockfor
& data condition.await(timeout, TimeUnit.MILLISECONDS) throw ReadTimeoutException() resolver.resolve() #Cassandra13
39.
o.a.c.service.StorageProxy.fetchRows() getLiveSortedEndpoints() new RowDigestResolver() new ReadCallback() MessagingService.sendRR() --------------------------------------- ReadCallback.get()
# blocking catch (DigestMismatchException ex) catch (ReadTimeoutException ex) #Cassandra13
40.
Dynamo Layer o.a.c.service o.a.c.net o.a.c.dht o.a.c.gms o.a.c.locator o.a.c.stream #Cassandra13
41.
o.a.c.net.MessagingService.verb<<enum>> MUTATION READ REQUEST_RESPONSE TREE_REQUEST TREE_RESPONSE (And more...) #Cassandra13
42.
o.a.c.net.MessagingService.verbHandlers new EnumMap<Verb, IVerbHandler>(Verb.class) #Cassandra13
43.
o.a.c.net.IVerbHandler<T> doVerb(MessageIn<T> message, String id); #Cassandra13
44.
o.a.c.net.MessagingService.verbStages new EnumMap<MessagingService.Verb, Stage>(MessagingService.Verb.class) #Cassandra13
45.
o.a.c.net.MessagingService.receive() runnable = new
MessageDeliveryTask( message, id, timestamp); StageManager.getStage( message.getMessageType()); stage.execute(runnable); #Cassandra13
46.
o.a.c.net.MessageDeliveryTask.run() // If dropable
and rpc_timeout MessagingService.incrementDroppedMessag es(verb); MessagingService.getVerbHandler(verb) verbHandler.doVerb(message, id) #Cassandra13
47.
Architecture API Layer Dynamo Layer Database
Layer #Cassandra13
48.
Database Layer o.a.c.concurrent o.a.c.db o.a.c.cache o.a.c.io o.a.c.trace #Cassandra13
49.
o.a.c.concurrent.StageManager stages = new
EnumMap<Stage, ThreadPoolExecutor>(Stage.class); getStage(Stage stage) #Cassandra13
50.
o.a.c.concurrent.Stage READ MUTATION GOSSIP REQUEST_RESPONSE ANTI_ENTROPY (And more...) #Cassandra13
51.
Database Layer o.a.c.concurrent o.a.c.db o.a.c.cache o.a.c.io o.a.c.trace #Cassandra13
52.
o.a.c.db.Table // Keyspace open(String table) getColumnFamilyStore(String
cfName) getRow(QueryFilter filter) apply(RowMutation mutation, boolean writeCommitLog) #Cassandra13
53.
o.a.c.db.ColumnFamilyStore // Column Family getColumnFamily(QueryFilter
filter) getTopLevelColumns(...) apply(DecoratedKey key, ColumnFamily columnFamily, SecondaryIndexManager.Updater indexer) #Cassandra13
54.
o.a.c.db.IColumnContainer addColumn(IColumn column) remove(ByteBuffer columnName) ColumnFamily SuperColumn #Cassandra13
55.
o.a.c.db.ISortedColumns addColumn(IColumn column, Allocator allocator) removeColumn(ByteBuffer
name) ArrayBackedSortedColumns AtomicSortedColumns TreeMapBackedSortedColumns #Cassandra13
56.
o.a.c.db.Memtable put(DecoratedKey key, ColumnFamily columnFamily, SecondaryIndexManager.Updater indexer) flushAndSignal(CountDownLatch
latch, Future<ReplayPosition> context) #Cassandra13
57.
o.a.c.db.ReadCommand getRow(Table table) SliceByNamesReadCommand SliceFromReadCommand #Cassandra13
58.
o.a.c.db.IDiskAtomFilter getMemtableColumnIterator(...) getSSTableColumnIterator(...) IdentityQueryFilter NamesQueryFilter SliceQueryFilter #Cassandra13
59.
Summary CustomTThreadPoolServer Message.Dispatcher CassandraServer QueryProcessor ReadCommand StorageProxy IResponseResolver IAsyncCallback MessagingService IVerbHandler Table
ColumnFamilyStore IDiskAtomFilter API Dynamo Database #Cassandra13
60.
Thanks. #Cassandra13
61.
Aaron Morton @aaronmorton www.thelastpickle.com Licensed under
a Creative Commons Attribution-NonCommercial 3.0 New Zealand License