{"record":{"id":"f1cf9f478637b7f7","repo":"apache/hadoop","slug":"initialization-of-all-the-collectors-failed","errorCode":null,"errorMessage":"Initialization of all the collectors failed.","messagePattern":"Initialization of all the collectors failed\\.","errorType":"exception","errorClass":"IOException","httpStatus":null,"severity":"error","filePath":"hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/MapTask.java","lineNumber":427,"sourceCode":"        collector.init(context);\n        LOG.info(\"Map output collector class = \" + collector.getClass().getName());\n        return collector;\n      } catch (Exception e) {\n        String msg = \"Unable to initialize MapOutputCollector \" + clazz.getName();\n        if (--remainingCollectors > 0) {\n          msg += \" (\" + remainingCollectors + \" more collector(s) to try)\";\n        }\n        lastException = e;\n        LOG.warn(msg, e);\n      }\n    }\n\n    if (lastException != null) {\n      throw new IOException(\"Initialization of all the collectors failed. \" +\n          \"Error in last collector was:\" + lastException.toString(),\n          lastException);\n    } else {\n      throw new IOException(\"Initialization of all the collectors failed.\");\n    }\n  }\n\n  @SuppressWarnings(\"unchecked\")\n  private <INKEY,INVALUE,OUTKEY,OUTVALUE>\n  void runOldMapper(final JobConf job,\n                    final TaskSplitIndex splitIndex,\n                    final TaskUmbilicalProtocol umbilical,\n                    TaskReporter reporter\n                    ) throws IOException, InterruptedException,\n                             ClassNotFoundException {\n    InputSplit inputSplit = getSplitDetails(new Path(splitIndex.getSplitLocation()),\n           splitIndex.getStartOffset());\n\n    updateJobWithSplit(job, inputSplit);\n    reporter.setInputSplit(inputSplit);\n\n    RecordReader<INKEY,INVALUE> in = isSkipping() ? ","sourceCodeStart":409,"sourceCodeEnd":445,"githubUrl":"https://github.com/apache/hadoop/blob/2add9630210752f88ceb1bb74eb65e37bf41da8e/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/MapTask.java#L409-L445","documentation":"Error \"Initialization of all the collectors failed.\" thrown in apache/hadoop.","triggerScenarios":"Thrown at hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/MapTask.java:427 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Fix the map output collector configuration (io.sort.mb, spill.percent, collector class) and ensure adequate task memory, then rerun the task."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"2add9630210752f88ceb1bb74eb65e37bf41da8e","analyzedAt":"2026-08-22T19:55:07.957Z","schemaVersion":2},"datasetVersion":"2026-08-22T20:17:22.307Z"}