/**
* 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.hadoop.hive.ql.optimizer;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Stack;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.ql.Context;
import org.apache.hadoop.hive.ql.exec.AbstractMapJoinOperator;
import org.apache.hadoop.hive.ql.exec.ColumnInfo;
import org.apache.hadoop.hive.ql.exec.ConditionalTask;
import org.apache.hadoop.hive.ql.exec.FileSinkOperator;
import org.apache.hadoop.hive.ql.exec.MapJoinOperator;
import org.apache.hadoop.hive.ql.exec.MapRedTask;
import org.apache.hadoop.hive.ql.exec.MoveTask;
import org.apache.hadoop.hive.ql.exec.Operator;
import org.apache.hadoop.hive.ql.exec.OperatorFactory;
import org.apache.hadoop.hive.ql.exec.RowSchema;
import org.apache.hadoop.hive.ql.exec.Task;
import org.apache.hadoop.hive.ql.exec.TaskFactory;
import org.apache.hadoop.hive.ql.exec.UnionOperator;
import org.apache.hadoop.hive.ql.exec.Utilities;
import org.apache.hadoop.hive.ql.io.RCFileInputFormat;
import org.apache.hadoop.hive.ql.io.rcfile.merge.MergeWork;
import org.apache.hadoop.hive.ql.lib.Node;
import org.apache.hadoop.hive.ql.lib.NodeProcessor;
import org.apache.hadoop.hive.ql.lib.NodeProcessorCtx;
import org.apache.hadoop.hive.ql.optimizer.GenMRProcContext.GenMRMapJoinCtx;
import org.apache.hadoop.hive.ql.parse.ErrorMsg;
import org.apache.hadoop.hive.ql.parse.ParseContext;
import org.apache.hadoop.hive.ql.parse.RowResolver;
import org.apache.hadoop.hive.ql.parse.SemanticAnalyzer;
import org.apache.hadoop.hive.ql.parse.SemanticException;
import org.apache.hadoop.hive.ql.parse.TypeCheckProcFactory;
import org.apache.hadoop.hive.ql.plan.ConditionalResolverMergeFiles;
import org.apache.hadoop.hive.ql.plan.ConditionalResolverMergeFiles.ConditionalResolverMergeFilesCtx;
import org.apache.hadoop.hive.ql.plan.ConditionalWork;
import org.apache.hadoop.hive.ql.plan.DynamicPartitionCtx;
import org.apache.hadoop.hive.ql.plan.ExprNodeColumnDesc;
import org.apache.hadoop.hive.ql.plan.ExprNodeDesc;
import org.apache.hadoop.hive.ql.plan.ExtractDesc;
import org.apache.hadoop.hive.ql.plan.FileSinkDesc;
import org.apache.hadoop.hive.ql.plan.LoadFileDesc;
import org.apache.hadoop.hive.ql.plan.MapJoinDesc;
import org.apache.hadoop.hive.ql.plan.MapredWork;
import org.apache.hadoop.hive.ql.plan.MoveWork;
import org.apache.hadoop.hive.ql.plan.PartitionDesc;
import org.apache.hadoop.hive.ql.plan.PlanUtils;
import org.apache.hadoop.hive.ql.plan.ReduceSinkDesc;
import org.apache.hadoop.hive.ql.plan.StatsWork;
import org.apache.hadoop.hive.ql.plan.TableDesc;
import org.apache.hadoop.hive.ql.plan.TableScanDesc;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoFactory;
import org.apache.hadoop.mapred.InputFormat;
/**
* Processor for the rule - table scan followed by reduce sink.
*/
public class GenMRFileSink1 implements NodeProcessor {
static final private Log LOG = LogFactory.getLog(GenMRFileSink1.class.getName());
public GenMRFileSink1() {
}
/**
* File Sink Operator encountered.
*
* @param nd
* the file sink operator encountered
* @param opProcCtx
* context
*/
public Object process(Node nd, Stack<Node> stack, NodeProcessorCtx opProcCtx,
Object... nodeOutputs) throws SemanticException {
GenMRProcContext ctx = (GenMRProcContext) opProcCtx;
ParseContext parseCtx = ctx.getParseCtx();
boolean chDir = false;
Task<? extends Serializable> currTask = ctx.getCurrTask();
FileSinkOperator fsOp = (FileSinkOperator) nd;
boolean isInsertTable = // is INSERT OVERWRITE TABLE
fsOp.getConf().getTableInfo().getTableName() != null &&
parseCtx.getQB().getParseInfo().isInsertToTable();
HiveConf hconf = parseCtx.getConf();
// Has the user enabled merging of files for map-only jobs or for all jobs
if ((ctx.getMvTask() != null) && (!ctx.getMvTask().isEmpty())) {
List<Task<? extends Serializable>> mvTasks = ctx.getMvTask();
// In case of unions or map-joins, it is possible that the file has
// already been seen.
// So, no need to attempt to merge the files again.
if ((ctx.getSeenFileSinkOps() == null)
|| (!ctx.getSeenFileSinkOps().contains(nd))) {
// no need of merging if the move is to a local file system
MoveTask mvTask = (MoveTask) findMoveTask(mvTasks, fsOp);
if (isInsertTable &&
hconf.getBoolVar(HiveConf.ConfVars.HIVESTATSAUTOGATHER)) {
addStatsTask(fsOp, mvTask, currTask, parseCtx.getConf());
}
if ((mvTask != null) && !mvTask.isLocal()) {
// There are separate configuration parameters to control whether to
// merge for a map-only job
// or for a map-reduce job
MapredWork currWork = (MapredWork) currTask.getWork();
boolean mergeMapOnly =
hconf.getBoolVar(HiveConf.ConfVars.HIVEMERGEMAPFILES) &&
currWork.getReducer() == null;
boolean mergeMapRed =
hconf.getBoolVar(HiveConf.ConfVars.HIVEMERGEMAPREDFILES) &&
currWork.getReducer() != null;
if (mergeMapOnly || mergeMapRed) {
chDir = true;
}
}
}
}
String finalName = processFS(nd, stack, opProcCtx, chDir);
// need to merge the files in the destination table/partitions
if (chDir && (finalName != null)) {
createMergeJob((FileSinkOperator) nd, ctx, finalName);
}
return null;
}
/**
* Add the StatsTask as a dependent task of the MoveTask
* because StatsTask will change the Table/Partition metadata. For atomicity, we
* should not change it before the data is actually there done by MoveTask.
* @param nd the FileSinkOperator whose results are taken care of by the MoveTask.
* @param mvTask The MoveTask that moves the FileSinkOperator's results.
* @param currTask The MapRedTask that the FileSinkOperator belongs to.
* @param hconf HiveConf
*/
private void addStatsTask(FileSinkOperator nd, MoveTask mvTask,
Task<? extends Serializable> currTask, HiveConf hconf) {
MoveWork mvWork = ((MoveTask)mvTask).getWork();
StatsWork statsWork = null;
if(mvWork.getLoadTableWork() != null){
statsWork = new StatsWork(mvWork.getLoadTableWork());
}else if (mvWork.getLoadFileWork() != null){
statsWork = new StatsWork(mvWork.getLoadFileWork());
}
assert statsWork != null : "Error when genereting StatsTask";
MapredWork mrWork = (MapredWork) currTask.getWork();
// AggKey in StatsWork is used for stats aggregation while StatsAggPrefix
// in FileSinkDesc is used for stats publishing. They should be consistent.
statsWork.setAggKey(((FileSinkOperator)nd).getConf().getStatsAggPrefix());
Task<? extends Serializable> statsTask = TaskFactory.get(statsWork, hconf);
// mark the MapredWork and FileSinkOperator for gathering stats
nd.getConf().setGatherStats(true);
mrWork.setGatheringStats(true);
// mrWork.addDestinationTable(nd.getConf().getTableInfo().getTableName());
// subscribe feeds from the MoveTask so that MoveTask can forward the list
// of dynamic partition list to the StatsTask
mvTask.addDependentTask(statsTask);
statsTask.subscribeFeed(mvTask);
}
private void createMapReduce4Merge(FileSinkOperator fsOp, GenMRProcContext ctx, String finalName)
throws SemanticException {
Task<? extends Serializable> currTask = ctx.getCurrTask();
RowSchema inputRS = fsOp.getSchema();
// create a reduce Sink operator - key is the first column
ArrayList<ExprNodeDesc> keyCols = new ArrayList<ExprNodeDesc>();
keyCols.add(TypeCheckProcFactory.DefaultExprProcessor
.getFuncExprNodeDesc("rand"));
// value is all the columns in the FileSink operator input
ArrayList<ExprNodeDesc> valueCols = new ArrayList<ExprNodeDesc>();
for (ColumnInfo ci : inputRS.getSignature()) {
valueCols.add(new ExprNodeColumnDesc(ci.getType(), ci.getInternalName(),
ci.getTabAlias(), ci.getIsVirtualCol()));
}
// create a dummy tableScan operator
Operator<? extends Serializable> tsMerge = OperatorFactory.get(
TableScanDesc.class, inputRS);
ArrayList<String> outputColumns = new ArrayList<String>();
for (int i = 0; i < valueCols.size(); i++) {
outputColumns.add(SemanticAnalyzer.getColumnInternalName(i));
}
ReduceSinkDesc rsDesc = PlanUtils.getReduceSinkDesc(
new ArrayList<ExprNodeDesc>(), valueCols, outputColumns, false, -1, -1,
-1);
OperatorFactory.getAndMakeChild(rsDesc, inputRS, tsMerge);
ParseContext parseCtx = ctx.getParseCtx();
FileSinkDesc fsConf = fsOp.getConf();
// Add the extract operator to get the value fields
RowResolver out_rwsch = new RowResolver();
RowResolver interim_rwsch = ctx.getParseCtx().getOpParseCtx().get(fsOp).getRowResolver();
Integer pos = Integer.valueOf(0);
for (ColumnInfo colInfo : interim_rwsch.getColumnInfos()) {
String[] info = interim_rwsch.reverseLookup(colInfo.getInternalName());
out_rwsch.put(info[0], info[1], new ColumnInfo(pos.toString(), colInfo
.getType(), info[0], colInfo.getIsVirtualCol(), colInfo.isHiddenVirtualCol()));
pos = Integer.valueOf(pos.intValue() + 1);
}
Operator<ExtractDesc> extract = OperatorFactory.getAndMakeChild(new ExtractDesc(
new ExprNodeColumnDesc(TypeInfoFactory.stringTypeInfo,
Utilities.ReduceField.VALUE.toString(), "", false)),
new RowSchema(out_rwsch.getColumnInfos()));
TableDesc ts = (TableDesc) fsConf.getTableInfo().clone();
fsConf.getTableInfo().getProperties().remove(
org.apache.hadoop.hive.metastore.api.Constants.META_TABLE_PARTITION_COLUMNS);
FileSinkDesc newFSD = new FileSinkDesc(finalName, ts, parseCtx.getConf()
.getBoolVar(HiveConf.ConfVars.COMPRESSRESULT));
FileSinkOperator newOutput = (FileSinkOperator) OperatorFactory.
getAndMakeChild(newFSD, inputRS, extract);
HiveConf conf = parseCtx.getConf();
MapredWork cplan = createMergeTask(conf, tsMerge, fsConf);
cplan.setReducer(extract);
// NOTE: we should gather stats in MR1 (rather than the merge MR job)
// since it is unknown if the merge MR will be triggered at execution time.
MoveWork dummyMv = new MoveWork(null, null, null,
new LoadFileDesc(fsConf.getDirName(), finalName, true, null, null), false);
ConditionalTask cndTsk = createCondTask(conf, currTask, dummyMv, cplan,
fsConf.getDirName());
LinkMoveTask(ctx, newOutput, cndTsk);
}
/**
* Create a MapReduce job for a particular partition if Hadoop version is pre 0.20,
* otherwise create a Map-only job using CombineHiveInputFormat for all partitions.
* @param fsOp The FileSink operator.
* @param ctx The MR processing context.
* @param finalName the final destination path the merge job should output.
* @throws SemanticException
*/
private void createMergeJob(FileSinkOperator fsOp, GenMRProcContext ctx, String finalName)
throws SemanticException {
// if the hadoop version support CombineFileInputFormat (version >= 0.20),
// create a Map-only job for merge, otherwise create a MapReduce merge job.
ParseContext parseCtx = ctx.getParseCtx();
HiveConf conf = parseCtx.getConf();
if (conf.getBoolVar(HiveConf.ConfVars.HIVEMERGEMAPONLY) &&
Utilities.supportCombineFileInputFormat()) {
// create Map-only merge job
createMap4Merge(fsOp, ctx, finalName);
LOG.info("use CombineHiveInputformat for the merge job");
} else {
if (fsOp.getConf().getDynPartCtx() != null) {
throw new SemanticException(ErrorMsg.DYNAMIC_PARTITION_MERGE.getMsg());
}
createMapReduce4Merge(fsOp, ctx, finalName);
LOG.info("use HiveInputFormat for the merge job");
}
}
/**
* create a Map-only merge job with the following operators:
* @param fsInput
* @param ctx
* @param finalName
* MR job J0:
* ...
* |
* v
* FileSinkOperator_1 (fsInput)
* |
* v
* Merge job J1:
* |
* v
* TableScan (using CombineHiveInputFormat) (tsMerge)
* |
* v
* FileSinkOperator (fsMerge)
*
* Here the pathToPartitionInfo & pathToAlias will remain the same, which means the paths do
* not contain the dynamic partitions (their parent). So after the dynamic partitions are
* created (after the first job finished before the moveTask or ConditionalTask start),
* we need to change the pathToPartitionInfo & pathToAlias to include the dynamic partition
* directories.
*
*/
private void createMap4Merge(FileSinkOperator fsInput, GenMRProcContext ctx, String finalName) throws SemanticException {
//
// 1. create the operator tree
//
ParseContext parseCtx = ctx.getParseCtx();
FileSinkDesc fsInputDesc = fsInput.getConf();
// Create a TableScan operator
RowSchema inputRS = fsInput.getSchema();
Operator<? extends Serializable> tsMerge = OperatorFactory.get(TableScanDesc.class, inputRS);
// Create a FileSink operator
TableDesc ts = (TableDesc) fsInputDesc.getTableInfo().clone();
FileSinkDesc fsOutputDesc = new FileSinkDesc(finalName, ts,
parseCtx.getConf().getBoolVar(HiveConf.ConfVars.COMPRESSRESULT));
FileSinkOperator fsOutput = (FileSinkOperator) OperatorFactory.getAndMakeChild(
fsOutputDesc, inputRS, tsMerge);
// If the input FileSinkOperator is a dynamic partition enabled, the tsMerge input schema
// needs to include the partition column, and the fsOutput should have
// a DynamicPartitionCtx to indicate that it needs to dynamically partitioned.
DynamicPartitionCtx dpCtx = fsInputDesc.getDynPartCtx();
if (dpCtx != null && dpCtx.getNumDPCols() > 0) {
// adding DP ColumnInfo to the RowSchema signature
ArrayList<ColumnInfo> signature = inputRS.getSignature();
String tblAlias = fsInputDesc.getTableInfo().getTableName();
LinkedHashMap<String, String> colMap = new LinkedHashMap<String, String>();
StringBuilder partCols = new StringBuilder();
for (String dpCol: dpCtx.getDPColNames()) {
ColumnInfo colInfo = new ColumnInfo(dpCol,
TypeInfoFactory.stringTypeInfo, // all partition column type should be string
tblAlias, true); // partition column is virtual column
signature.add(colInfo);
colMap.put(dpCol, dpCol); // input and output have the same column name
partCols.append(dpCol).append('/');
}
partCols.setLength(partCols.length()-1); // remove the last '/'
inputRS.setSignature(signature);
// create another DynamicPartitionCtx, which has a different input-to-DP column mapping
DynamicPartitionCtx dpCtx2 = new DynamicPartitionCtx(dpCtx);
dpCtx2.setInputToDPCols(colMap);
fsOutputDesc.setDynPartCtx(dpCtx2);
// update the FileSinkOperator to include partition columns
fsInputDesc.getTableInfo().getProperties().setProperty(
org.apache.hadoop.hive.metastore.api.Constants.META_TABLE_PARTITION_COLUMNS,
partCols.toString()); // list of dynamic partition column names
} else {
// non-partitioned table
fsInputDesc.getTableInfo().getProperties().remove(
org.apache.hadoop.hive.metastore.api.Constants.META_TABLE_PARTITION_COLUMNS);
}
//
// 2. Constructing a conditional task consisting of a move task and a map reduce task
//
MapRedTask currTask = (MapRedTask) ctx.getCurrTask();
MoveWork dummyMv = new MoveWork(null, null, null,
new LoadFileDesc(fsInputDesc.getDirName(), finalName, true, null, null), false);
MapredWork cplan;
if(parseCtx.getConf().getBoolVar(HiveConf.ConfVars.
HIVEMERGERCFILEBLOCKLEVEL) &&
fsInputDesc.getTableInfo().getInputFileFormatClass().
equals(RCFileInputFormat.class)) {
// Check if InputFormatClass is valid
String inputFormatClass = parseCtx.getConf().
getVar(HiveConf.ConfVars.HIVEMERGEINPUTFORMATBLOCKLEVEL);
try {
Class c = (Class <? extends InputFormat>) Class.forName(inputFormatClass);
LOG.info("RCFile format- Using block level merge");
cplan = createRCFileMergeTask(fsInputDesc, finalName,
dpCtx != null && dpCtx.getNumDPCols() > 0);
} catch (ClassNotFoundException e) {
String msg = "Illegal input format class: " + inputFormatClass;
throw new SemanticException(msg);
}
} else {
cplan = createMergeTask(ctx.getConf(), tsMerge, fsInputDesc);
// use CombineHiveInputFormat for map-only merging
}
cplan.setInputformat("org.apache.hadoop.hive.ql.io.CombineHiveInputFormat");
// NOTE: we should gather stats in MR1 rather than MR2 at merge job since we don't
// know if merge MR2 will be triggered at execution time
ConditionalTask cndTsk = createCondTask(ctx.getConf(), ctx.getCurrTask(), dummyMv, cplan,
fsInputDesc.getDirName());
// keep the dynamic partition context in conditional task resolver context
ConditionalResolverMergeFilesCtx mrCtx =
(ConditionalResolverMergeFilesCtx) cndTsk.getResolverCtx();
mrCtx.setDPCtx(fsInputDesc.getDynPartCtx());
//
// 3. add the moveTask as the children of the conditional task
//
LinkMoveTask(ctx, fsOutput, cndTsk);
}
private void LinkMoveTask(GenMRProcContext ctx, FileSinkOperator newOutput,
ConditionalTask cndTsk) {
List<Task<? extends Serializable>> mvTasks = ctx.getMvTask();
Task<? extends Serializable> mvTask = findMoveTask(mvTasks, newOutput);
if (mvTask != null) {
for (Task<? extends Serializable> tsk : cndTsk.getListTasks()) {
tsk.addDependentTask(mvTask);
}
}
}
/**
* Create a MapredWork based on input path, the top operator and the input
* table descriptor.
* @param conf
* @param topOp the table scan operator that is the root of the MapReduce task.
* @param fsDesc the file sink descriptor that serves as the input to this merge task.
* @param parentMR the parent MapReduce work
* @param parentFS the last FileSinkOperator in the parent MapReduce work
* @return the MapredWork
*/
private MapredWork createMergeTask(HiveConf conf, Operator<? extends Serializable> topOp,
FileSinkDesc fsDesc) {
ArrayList<String> aliases = new ArrayList<String>();
String inputDir = fsDesc.getDirName();
TableDesc tblDesc = fsDesc.getTableInfo();
aliases.add(inputDir); // dummy alias: just use the input path
// constructing the default MapredWork
MapredWork cplan = GenMapRedUtils.getMapRedWorkFromConf(conf);
cplan.getPathToAliases().put(inputDir, aliases);
cplan.getPathToPartitionInfo().put(inputDir, new PartitionDesc(tblDesc, null));
cplan.setNumReduceTasks(0);
cplan.getAliasToWork().put(inputDir, topOp);
cplan.setMapperCannotSpanPartns(true);
return cplan;
}
/**
* Create a block level merge task for RCFiles.
* @param fsInputDesc
* @param finalName
* @return MergeWork if table is stored as RCFile,
* null otherwise
*/
private MapredWork createRCFileMergeTask(FileSinkDesc fsInputDesc,
String finalName, boolean hasDynamicPartitions) throws SemanticException {
String inputDir = fsInputDesc.getDirName();
TableDesc tblDesc = fsInputDesc.getTableInfo();
if(tblDesc.getInputFileFormatClass().equals(RCFileInputFormat.class)) {
ArrayList<String> inputDirs = new ArrayList<String>();
if (!hasDynamicPartitions) {
inputDirs.add(inputDir);
}
MergeWork work = new MergeWork(inputDirs, finalName,
hasDynamicPartitions);
LinkedHashMap<String, ArrayList<String>> pathToAliases =
new LinkedHashMap<String, ArrayList<String>>();
pathToAliases.put(inputDir, (ArrayList<String>) inputDirs.clone());
work.setMapperCannotSpanPartns(true);
work.setPathToAliases(pathToAliases);
work.setAliasToWork(
new LinkedHashMap<String, Operator<? extends Serializable>>());
if (hasDynamicPartitions) {
work.getPathToPartitionInfo().put(inputDir,
new PartitionDesc(tblDesc, null));
}
return work;
}
throw new SemanticException("createRCFileMergeTask called on non-RCFile table");
}
/**
* Construct a conditional task given the current leaf task, the MoveWork and the MapredWork.
* @param conf HiveConf
* @param currTask current leaf task
* @param mvWork MoveWork for the move task
* @param mergeWork MapredWork for the merge task.
* @param inputPath the input directory of the merge/move task
* @return The conditional task
*/
private ConditionalTask createCondTask(HiveConf conf,
Task<? extends Serializable> currTask, MoveWork mvWork,
MapredWork mergeWork, String inputPath) {
Task<? extends Serializable> mergeTask = TaskFactory.get(mergeWork, conf);
Task<? extends Serializable> moveTask = TaskFactory.get(mvWork, conf);
List<Serializable> listWorks = new ArrayList<Serializable>();
listWorks.add(mvWork);
listWorks.add(mergeWork);
ConditionalWork cndWork = new ConditionalWork(listWorks);
List<Task<? extends Serializable>> listTasks = new ArrayList<Task<? extends Serializable>>();
listTasks.add(moveTask);
listTasks.add(mergeTask);
ConditionalTask cndTsk = (ConditionalTask) TaskFactory.get(cndWork, conf);
cndTsk.setListTasks(listTasks);
// create resolver
cndTsk.setResolver(new ConditionalResolverMergeFiles());
ConditionalResolverMergeFilesCtx mrCtx =
new ConditionalResolverMergeFilesCtx(listTasks, inputPath);
cndTsk.setResolverCtx(mrCtx);
// make the conditional task as the child of the current leaf task
currTask.addDependentTask(cndTsk);
return cndTsk;
}
private Task<? extends Serializable> findMoveTask(
List<Task<? extends Serializable>> mvTasks, FileSinkOperator fsOp) {
// find the move task
for (Task<? extends Serializable> mvTsk : mvTasks) {
MoveWork mvWork = (MoveWork) mvTsk.getWork();
String srcDir = null;
if (mvWork.getLoadFileWork() != null) {
srcDir = mvWork.getLoadFileWork().getSourceDir();
} else if (mvWork.getLoadTableWork() != null) {
srcDir = mvWork.getLoadTableWork().getSourceDir();
}
if ((srcDir != null)
&& (srcDir.equalsIgnoreCase(fsOp.getConf().getDirName()))) {
return mvTsk;
}
}
return null;
}
/**
* Process the FileSink operator to generate a MoveTask if necessary.
* @param nd current FileSink operator
* @param stack parent operators
* @param opProcCtx
* @param chDir whether the operator should be first output to a tmp dir and then merged
* to the final dir later
* @return the final file name to which the FileSinkOperator should store.
* @throws SemanticException
*/
private String processFS(Node nd, Stack<Node> stack,
NodeProcessorCtx opProcCtx, boolean chDir) throws SemanticException {
// Is it the dummy file sink after the mapjoin
FileSinkOperator fsOp = (FileSinkOperator) nd;
if ((fsOp.getParentOperators().size() == 1)
&& (fsOp.getParentOperators().get(0) instanceof MapJoinOperator)) {
return null;
}
GenMRProcContext ctx = (GenMRProcContext) opProcCtx;
List<FileSinkOperator> seenFSOps = ctx.getSeenFileSinkOps();
if (seenFSOps == null) {
seenFSOps = new ArrayList<FileSinkOperator>();
}
if (!seenFSOps.contains(fsOp)) {
seenFSOps.add(fsOp);
}
ctx.setSeenFileSinkOps(seenFSOps);
Task<? extends Serializable> currTask = ctx.getCurrTask();
// If the directory needs to be changed, send the new directory
String dest = null;
if (chDir) {
dest = fsOp.getConf().getDirName();
// generate the temporary file
// it must be on the same file system as the current destination
ParseContext parseCtx = ctx.getParseCtx();
Context baseCtx = parseCtx.getContext();
String tmpDir = baseCtx.getExternalTmpFileURI((new Path(dest)).toUri());
fsOp.getConf().setDirName(tmpDir);
}
Task<? extends Serializable> mvTask = null;
if (!chDir) {
mvTask = findMoveTask(ctx.getMvTask(), fsOp);
}
Operator<? extends Serializable> currTopOp = ctx.getCurrTopOp();
String currAliasId = ctx.getCurrAliasId();
HashMap<Operator<? extends Serializable>, Task<? extends Serializable>> opTaskMap =
ctx.getOpTaskMap();
List<Operator<? extends Serializable>> seenOps = ctx.getSeenOps();
List<Task<? extends Serializable>> rootTasks = ctx.getRootTasks();
// Set the move task to be dependent on the current task
if (mvTask != null) {
currTask.addDependentTask(mvTask);
}
// In case of multi-table insert, the path to alias mapping is needed for
// all the sources. Since there is no
// reducer, treat it as a plan with null reducer
// If it is a map-only job, the task needs to be processed
if (currTopOp != null) {
Task<? extends Serializable> mapTask = opTaskMap.get(null);
if (mapTask == null) {
if (!seenOps.contains(currTopOp)) {
seenOps.add(currTopOp);
GenMapRedUtils.setTaskPlan(currAliasId, currTopOp,
(MapredWork) currTask.getWork(), false, ctx);
}
opTaskMap.put(null, currTask);
if (!rootTasks.contains(currTask)) {
rootTasks.add(currTask);
}
} else {
if (!seenOps.contains(currTopOp)) {
seenOps.add(currTopOp);
GenMapRedUtils.setTaskPlan(currAliasId, currTopOp,
(MapredWork) mapTask.getWork(), false, ctx);
} else {
UnionOperator currUnionOp = ctx.getCurrUnionOp();
if (currUnionOp != null) {
opTaskMap.put(null, currTask);
ctx.setCurrTopOp(null);
GenMapRedUtils.initUnionPlan(ctx, currTask, false);
return dest;
}
}
// mapTask and currTask should be merged by and join/union operator
// (e.g., GenMRUnion1j) which has multiple topOps.
// assert mapTask == currTask : "mapTask.id = " + mapTask.getId()
// + "; currTask.id = " + currTask.getId();
}
return dest;
}
UnionOperator currUnionOp = ctx.getCurrUnionOp();
if (currUnionOp != null) {
opTaskMap.put(null, currTask);
GenMapRedUtils.initUnionPlan(ctx, currTask, false);
return dest;
}
AbstractMapJoinOperator<? extends MapJoinDesc> currMapJoinOp = ctx.getCurrMapJoinOp();
if (currMapJoinOp != null) {
opTaskMap.put(null, currTask);
GenMRMapJoinCtx mjCtx = ctx.getMapJoinCtx(currMapJoinOp);
MapredWork plan = (MapredWork) currTask.getWork();
String taskTmpDir = mjCtx.getTaskTmpDir();
TableDesc tt_desc = mjCtx.getTTDesc();
assert plan.getPathToAliases().get(taskTmpDir) == null;
plan.getPathToAliases().put(taskTmpDir, new ArrayList<String>());
plan.getPathToAliases().get(taskTmpDir).add(taskTmpDir);
plan.getPathToPartitionInfo().put(taskTmpDir,
new PartitionDesc(tt_desc, null));
plan.getAliasToWork().put(taskTmpDir, mjCtx.getRootMapJoinOp());
return dest;
}
return dest;
}
}