public override void Configure(JobConf job) { SetKeep(job.GetFloat(GenericMRLoadGenerator.ReducePreservePercent, (float)100.0) / (float)100.0); }
public MergeManagerImpl(TaskAttemptID reduceId, JobConf jobConf, FileSystem localFS , LocalDirAllocator localDirAllocator, Reporter reporter, CompressionCodec codec , Type combinerClass, Task.CombineOutputCollector <K, V> combineCollector, Counters.Counter spilledRecordsCounter, Counters.Counter reduceCombineInputCounter, Counters.Counter mergedMapOutputsCounter, ExceptionReporter exceptionReporter, Progress mergePhase , MapOutputFile mapOutputFile) { /* Maximum percentage of the in-memory limit that a single shuffle can * consume*/ this.reduceId = reduceId; this.jobConf = jobConf; this.localDirAllocator = localDirAllocator; this.exceptionReporter = exceptionReporter; this.reporter = reporter; this.codec = codec; this.combinerClass = combinerClass; this.combineCollector = combineCollector; this.reduceCombineInputCounter = reduceCombineInputCounter; this.spilledRecordsCounter = spilledRecordsCounter; this.mergedMapOutputsCounter = mergedMapOutputsCounter; this.mapOutputFile = mapOutputFile; this.mapOutputFile.SetConf(jobConf); this.localFS = localFS; this.rfs = ((LocalFileSystem)localFS).GetRaw(); float maxInMemCopyUse = jobConf.GetFloat(MRJobConfig.ShuffleInputBufferPercent, MRJobConfig .DefaultShuffleInputBufferPercent); if (maxInMemCopyUse > 1.0 || maxInMemCopyUse < 0.0) { throw new ArgumentException("Invalid value for " + MRJobConfig.ShuffleInputBufferPercent + ": " + maxInMemCopyUse); } // Allow unit tests to fix Runtime memory this.memoryLimit = (long)(jobConf.GetLong(MRJobConfig.ReduceMemoryTotalBytes, Runtime .GetRuntime().MaxMemory()) * maxInMemCopyUse); this.ioSortFactor = jobConf.GetInt(MRJobConfig.IoSortFactor, 100); float singleShuffleMemoryLimitPercent = jobConf.GetFloat(MRJobConfig.ShuffleMemoryLimitPercent , DefaultShuffleMemoryLimitPercent); if (singleShuffleMemoryLimitPercent <= 0.0f || singleShuffleMemoryLimitPercent > 1.0f) { throw new ArgumentException("Invalid value for " + MRJobConfig.ShuffleMemoryLimitPercent + ": " + singleShuffleMemoryLimitPercent); } usedMemory = 0L; commitMemory = 0L; this.maxSingleShuffleLimit = (long)(memoryLimit * singleShuffleMemoryLimitPercent ); this.memToMemMergeOutputsThreshold = jobConf.GetInt(MRJobConfig.ReduceMemtomemThreshold , ioSortFactor); this.mergeThreshold = (long)(this.memoryLimit * jobConf.GetFloat(MRJobConfig.ShuffleMergePercent , 0.90f)); Log.Info("MergerManager: memoryLimit=" + memoryLimit + ", " + "maxSingleShuffleLimit=" + maxSingleShuffleLimit + ", " + "mergeThreshold=" + mergeThreshold + ", " + "ioSortFactor=" + ioSortFactor + ", " + "memToMemMergeOutputsThreshold=" + memToMemMergeOutputsThreshold ); if (this.maxSingleShuffleLimit >= this.mergeThreshold) { throw new RuntimeException("Invalid configuration: " + "maxSingleShuffleLimit should be less than mergeThreshold " + "maxSingleShuffleLimit: " + this.maxSingleShuffleLimit + "mergeThreshold: " + this.mergeThreshold); } bool allowMemToMemMerge = jobConf.GetBoolean(MRJobConfig.ReduceMemtomemEnabled, false ); if (allowMemToMemMerge) { this.memToMemMerger = new MergeManagerImpl.IntermediateMemoryToMemoryMerger(this, this, memToMemMergeOutputsThreshold); this.memToMemMerger.Start(); } else { this.memToMemMerger = null; } this.inMemoryMerger = CreateInMemoryMerger(); this.inMemoryMerger.Start(); this.onDiskMerger = new MergeManagerImpl.OnDiskMerger(this, this); this.onDiskMerger.Start(); this.mergePhase = mergePhase; }