UserServer 目的是对于UserRPCServer 进行生命周期管理（基于netty 开发的）主要是处理非web 请求（实际上就是直接链接的服务）
从官方源码上UserServer 的创建只能在协调节点（当然候选节点也是可以执行rpc 服务的）
参考创建
DACDaemonModule
if (isCoordinator) {registry.bindSelf(
new UserServer(
config,
registry.provider(java.util.concurrent.ExecutorService.class),
registry.provider(BufferAllocator.class),
registry.provider(UserService.class),
registry.provider(NodeEndpoint.class),
registry.provider(UserWorker.class),
dacConfig.autoPort,
bootstrapRegistry.lookup(Tracer.class),
registry.provider(OptionValidatorListing.class)
)
);
}
UserRPCServer的启动
因为实现了service 接口，包含了start，具体对于UserRPCServer 的启动就是在此处的
UserServer
public void start() throws Exception {final SabotConfig sabotConfig = config.getSabotConfig();
allocator = bufferAllocator.get()
.newChildAllocator(
"rpc:user",
sabotConfig.getLong("dremio.exec.rpc.user.server.memory.reservation"),sabotConfig.getLong("dremio.exec.rpc.user.server.memory.maximum"));// 具有netty 的服务启动
final EventLoopGroup eventLoopGroup = TransportCheck
.createEventLoopGroup(sabotConfig.getInt(ExecConstants.USER_SERVER_RPC_THREADS), "UserServer-");
eventLoopCloseable = new EventLoopCloseable(eventLoopGroup);
server = newUserRPCServer(eventLoopGroup);
Metrics.newGauge("rpc.user.current", allocator::getAllocatedMemory);Metrics.newGauge("rpc.user.peak", allocator::getPeakMemoryAllocation);// 默认端口为31010
int initialPort = sabotConfig.getInt(DremioClient.INITIAL_USER_PORT);
if(allowPortHunting){initialPort += 333;
}
port = server.bind(initialPort, allowPortHunting);
}
UserRPCServer 类图
rpc 内部任务的实行依赖了UserWorker，具体实现是在ForemenWorkManager 中定义的，也比较符合drill 的特点，foreman 是一个long running 任务
主要支持的协议处理
UserRPCServer 中的WorkIngestorImpl 类
// 会包含不同的rpc 请求类型
@Override
public void feedWork(UserClientConnectionImpl connection, int rpcType, byte[] pBody, ByteBuf dBody,
ResponseSender responseSender) throws RpcException {final UserWorker worker = this.worker.get();
final TerminationListenerRegistry registry = connection;
switch (rpcType) {
case RpcType.RUN_QUERY_VALUE: {logger.debug("Received query to run. Returning query handle.");final RunQuery query = parse(pBody, RunQuery.PARSER, RunQuery.class);
UserRequest request = new UserRequest(RpcType.RUN_QUERY, query);
final ExternalId externalId = ExternalIdHelper.generateExternalId();
// UserWorker 请求会直接到ForemenWorkManager的submitWork，实际执行需要依赖CommandPool，可以参考以前写的简单的说明
worker.submitWork(externalId, connection.getSession(), new UserConnectionResponseHandler(connection), request, registry);
responseSender.send(new Response(RpcType.QUERY_HANDLE, ExternalIdHelper.toQueryId(externalId)));
break;
}
case RpcType.CANCEL_QUERY_VALUE: {final QueryId queryId = parse(pBody, QueryId.PARSER, QueryId.class);
final Ack ack = worker.cancelQuery(ExternalIdHelper.toExternal(queryId),
connection.getSession().getCredentials().getUserName());
responseSender.send(new Response(RpcType.ACK, ack));
break;
}
case RpcType.RESUME_PAUSED_QUERY_VALUE: {final QueryId queryId = parse(pBody, QueryId.PARSER, QueryId.class);
final Ack ack = worker.resumeQuery(ExternalIdHelper.toExternal(queryId));
responseSender.send(new Response(RpcType.ACK, ack));
break;
}
case RpcType.GET_CATALOGS_VALUE: {final GetCatalogsReq req = parse(pBody, GetCatalogsReq.PARSER, GetCatalogsReq.class);
UserRequest request = new UserRequest(RpcType.GET_CATALOGS, req);
worker.submitWork(connection.getSession(), new MetadataProvider.CatalogsHandler(responseSender), request, registry);
break;
}
case RpcType.GET_SCHEMAS_VALUE: {final GetSchemasReq req = parse(pBody, GetSchemasReq.PARSER, GetSchemasReq.class);
UserRequest request = new UserRequest(RpcType.GET_SCHEMAS, req);
worker.submitWork(connection.getSession(), new MetadataProvider.SchemasHandler(responseSender), request, registry);
break;
}
case RpcType.GET_TABLES_VALUE: {final GetTablesReq req = parse(pBody, GetTablesReq.PARSER, GetTablesReq.class);
UserRequest request = new UserRequest(RpcType.GET_TABLES, req);
worker.submitWork(connection.getSession(), new MetadataProvider.TablesHandler(responseSender), request, registry);
break;
}
case RpcType.GET_COLUMNS_VALUE: {final GetColumnsReq req = parse(pBody, GetColumnsReq.PARSER, GetColumnsReq.class);
UserRequest request = new UserRequest(RpcType.GET_COLUMNS, req);
worker.submitWork(connection.getSession(), new MetadataProvider.ColumnsHandler(responseSender), request, registry);
break;
}
case RpcType.CREATE_PREPARED_STATEMENT_VALUE: {final CreatePreparedStatementReq req = parse(pBody, CreatePreparedStatementReq.PARSER, CreatePreparedStatementReq.class);
UserRequest request = new UserRequest(RpcType.CREATE_PREPARED_STATEMENT, req);
worker.submitWork(connection.getSession(), new PreparedStatementProvider.PreparedStatementHandler(responseSender), request, registry);
break;
}
case RpcType.CREATE_PREPARED_STATEMENT_ARROW_VALUE: {final CreatePreparedStatementArrowReq req = parse(pBody, CreatePreparedStatementArrowReq.PARSER, CreatePreparedStatementArrowReq.class);
UserRequest request = new UserRequest(RpcType.CREATE_PREPARED_STATEMENT_ARROW, req);
worker.submitWork(connection.getSession(), new PreparedStatementProvider.PreparedStatementArrowHandler(responseSender), request, registry);
break;
}
case RpcType.GET_SERVER_META_VALUE: {final GetServerMetaReq req = parse(pBody, GetServerMetaReq.PARSER, GetServerMetaReq.class);
UserRequest request = new UserRequest(RpcType.GET_SERVER_META, req);
worker.submitWork(connection.getSession(), new ServerMetaProvider.ServerMetaHandler(responseSender), request, registry);
break;
}
default:
throw new UnsupportedOperationException(String.format("UserServer received rpc of unknown type. Type was %d.", rpcType));}
}
}
执行调用参考
可以看看实际rpc 的执行情况
ts=2022-12-29 07:12:15;thread_name=USER-rpc-event-queue;id=95;is_daemon=true;priority=10;TCCL=sun.misc.Launcher$AppClassLoader@18b4aac2
@com.dremio.sabot.rpc.user.UserRPCServer.handle()
at com.dremio.exec.rpc.RpcBus$RequestEvent.run(RpcBus.java:475)
at com.dremio.common.SerializedExecutor$RunnableProcessor.run(SerializedExecutor.java:96)
at com.dremio.exec.rpc.RpcBus$SameExecutor.execute(RpcBus.java:341)
at com.dremio.common.SerializedExecutor.execute(SerializedExecutor.java:129)
at com.dremio.exec.rpc.RpcBus$InboundHandler.decode(RpcBus.java:375)
at com.dremio.exec.rpc.RpcBus$InboundHandler.decode(RpcBus.java:346)
at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:88)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:286)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:324)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:296)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:719)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at java.lang.Thread.run(Thread.java:750)
ts=2022-12-29 07:12:15;thread_name=out-of-band-observer;id=ae9;is_daemon=true;priority=10;TCCL=sun.misc.Launcher$AppClassLoader@18b4aac2
@com.dremio.sabot.rpc.user.UserRPCServer.access$000()
at com.dremio.sabot.rpc.user.UserRPCServer$UserClientConnectionImpl.sendResult(UserRPCServer.java:575)
at com.dremio.exec.work.protector.UserConnectionResponseHandler.completed(UserConnectionResponseHandler.java:36)
at com.dremio.service.jobs.LocalJobsService$QueryListener.execCompletion(LocalJobsService.java:1731)
at com.dremio.exec.planner.observer.OutOfBandQueryObserver$1.run(OutOfBandQueryObserver.java:50)
at com.dremio.common.SerializedExecutor$RunnableProcessor.run(SerializedExecutor.java:96)
at com.dremio.context.RequestContext.run(RequestContext.java:96)
at com.dremio.common.concurrent.ContextMigratingExecutorService.lambda$decorate$3(ContextMigratingExecutorService.java:199)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:750)
ts=2022-12-29 07:12:15;thread_name=USER-rpc-event-queue;id=95;is_daemon=true;priority=10;TCCL=sun.misc.Launcher$AppClassLoader@18b4aac2
@com.dremio.sabot.rpc.user.UserRPCServer.getResponseDefaultInstance()
at com.dremio.exec.rpc.RpcBus$ResponseEvent.run(RpcBus.java:518)
at com.dremio.common.SerializedExecutor$RunnableProcessor.run(SerializedExecutor.java:96)
at com.dremio.exec.rpc.RpcBus$SameExecutor.execute(RpcBus.java:341)
at com.dremio.common.SerializedExecutor.execute(SerializedExecutor.java:129)
at com.dremio.exec.rpc.RpcBus$InboundHandler.decode(RpcBus.java:380)
at com.dremio.exec.rpc.RpcBus$InboundHandler.decode(RpcBus.java:346)
at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:88)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:286)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:324)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:296)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:719)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at java.lang.Thread.run(Thread.java:750)
说明
dremio 的默认jdbc 请求处理是基于UserServer的包装处理的，实际是UserRPCServer ，内部实现基于了netty进行网络处理
对于想了解实际客户端执行的可以参考，同时建议深入再看看源码
参考资料
sabot/kernel/src/main/java/com/dremio/sabot/rpc/user/UserServer.java
services/base-rpc/src/main/java/com/dremio/exec/rpc/BasicServer.java
dac/backend/src/main/java/com/dremio/dac/daemon/DACDaemonModule.java
sabot/kernel/src/test/java/com/dremio/exec/server/SabotNode.java
sabot/kernel/src/test/java/com/dremio/sabot/rpc/user/TestUserRpcServer.java
sabot/kernel/src/main/java/com/dremio/exec/work/protector/UserWorker.java
sabot/kernel/src/main/java/com/dremio/sabot/rpc/user/WorkIngestor.java
sabot/kernel/src/main/java/com/dremio/exec/work/protector/ForemenWorkManager.java
