title: java.lang.OutOfMemoryError: Java heap space error while executing Hive query
body: <p>While running the Hive query from Hive Shell using TEZ execution engine, I am getting java.lang.OutOfMemoryError: Java heap space error in the logs, but the query is getting completed at the end.</p>
  <p>I wanted to understand why am I getting this error in the logs, this query used to work without any issue in the past.</p>
  <p>Does anyone have any clue or document which will help me understand the issue. I tried google it but it didn't help much.</p>
  <p>Thanks in Advance for the Help!!!</p>
  <pre><code>ERROR : Status: Failed
  ERROR : Vertex failed, vertexName=Map 3, vertexId=vertex_1622153507491_0145_1_02, diagnostics=[Task failed, taskId=task_1622153507491_0145_1_02_000006, diagnostics=[TaskAttempt 0 failed, info=[Error: Error while running task ( failure ) : java.lang.RuntimeException: Map operator initialization failed
          at org.apache.hadoop.hive.ql.exec.tez.MapRecordProcessor.init(MapRecordProcessor.java:361)
          at org.apache.hadoop.hive.ql.exec.tez.TezProcessor.initializeAndRunProcessor(TezProcessor.java:266)
          at org.apache.hadoop.hive.ql.exec.tez.TezProcessor.run(TezProcessor.java:250)
          at org.apache.tez.runtime.LogicalIOProcessorRuntimeTask.run(LogicalIOProcessorRuntimeTask.java:374)
          at org.apache.tez.runtime.task.TaskRunner2Callable$1.run(TaskRunner2Callable.java:73)
          at org.apache.tez.runtime.task.TaskRunner2Callable$1.run(TaskRunner2Callable.java:61)
          at java.security.AccessController.doPrivileged(Native Method)
          at javax.security.auth.Subject.doAs(Subject.java:422)
          at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1730)
          at org.apache.tez.runtime.task.TaskRunner2Callable.callInternal(TaskRunner2Callable.java:61)
          at org.apache.tez.runtime.task.TaskRunner2Callable.callInternal(TaskRunner2Callable.java:37)
          at org.apache.tez.common.CallableWithNdc.call(CallableWithNdc.java:36)
          at com.google.common.util.concurrent.TrustedListenableFutureTask$TrustedFutureInterruptibleTask.runInterruptibly(TrustedListenableFutureTask.java:108)
          at com.google.common.util.concurrent.InterruptibleTask.run(InterruptibleTask.java:41)
          at com.google.common.util.concurrent.TrustedListenableFutureTask.run(TrustedListenableFutureTask.java:77)
          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:748)
  Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Async Initialization failed. abortRequested=false
          at org.apache.hadoop.hive.ql.exec.Operator.completeInitialization(Operator.java:465)
          at org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:399)
          at org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:572)
          at org.apache.hadoop.hive.ql.exec.Operator.initializeChildren(Operator.java:524)
          at org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:385)
          at org.apache.hadoop.hive.ql.exec.tez.MapRecordProcessor.init(MapRecordProcessor.java:342)
          ... 17 more
  Caused by: java.lang.OutOfMemoryError: Java heap space
          at org.apache.hadoop.hive.serde2.WriteBuffers.nextBufferToWrite(WriteBuffers.java:261)
          at org.apache.hadoop.hive.serde2.WriteBuffers.write(WriteBuffers.java:237)
          at org.apache.hadoop.hive.ql.exec.vector.mapjoin.fast.VectorMapJoinFastBytesHashMapStore.addMore(VectorMapJoinFastBytesHashMapStore.java:539)
          at org.apache.hadoop.hive.ql.exec.vector.mapjoin.fast.VectorMapJoinFastBytesHashMap.add(VectorMapJoinFastBytesHashMap.java:101)
          at org.apache.hadoop.hive.ql.exec.vector.mapjoin.fast.VectorMapJoinFastStringCommon.adaptPutRow(VectorMapJoinFastStringCommon.java:59)
          at org.apache.hadoop.hive.ql.exec.vector.mapjoin.fast.VectorMapJoinFastStringHashMap.putRow(VectorMapJoinFastStringHashMap.java:37)
          at org.apache.hadoop.hive.ql.exec.vector.mapjoin.fast.VectorMapJoinFastTableContainer.putRow(VectorMapJoinFastTableContainer.java:183)
          at org.apache.hadoop.hive.ql.exec.vector.mapjoin.fast.VectorMapJoinFastHashTableLoader.load(VectorMapJoinFastHashTableLoader.java:130)
          at org.apache.hadoop.hive.ql.exec.MapJoinOperator.loadHashTableInternal(MapJoinOperator.java:344)
          at org.apache.hadoop.hive.ql.exec.MapJoinOperator.loadHashTable(MapJoinOperator.java:413)
          at org.apache.hadoop.hive.ql.exec.MapJoinOperator.lambda$initializeOp$0(MapJoinOperator.java:215)
          at org.apache.hadoop.hive.ql.exec.MapJoinOperator$$Lambda$27/55723736.call(Unknown Source)
          at org.apache.hadoop.hive.ql.exec.tez.ObjectCache.retrieve(ObjectCache.java:96)
          at org.apache.hadoop.hive.ql.exec.tez.ObjectCache$1.call(ObjectCache.java:113)
          at java.util.concurrent.FutureTask.run(FutureTask.java:266)
          ... 3 more
  
  </code></pre>