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Portion of total memory to be used by map-side grup group aggregation hash table, when this group by is followed by map join.

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The max memory to be used by map-side grup group aggregation hash table, if the memory usage is higher than this number, force to flush data.

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Portion of total memory to be used by map-side grup group aggregation hash table.

hive.map.aggr.hash.min.reduction

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This number means how much memory the local task can take to hold the key/value into in-memory hash table; If the local task's memory usage is more than this number, the local task will be abort by themselfaborted. It means the data of small table is too large to be hold held in the memory.

hive.mapjoin.followby.gby.localtask.max.memory.usage

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This number means how much memory the local task can take to hold the key/value into in-memory hash table when this map join followed by a group by; If the local task's memory usage is more than this number, the local task will be abort by themselfaborted. It means the data of small table is too large to be hold held in the memory.

hive.mapjoin.check.memory.rows

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Whether Hive should automatically send progress information to TaskTracker when using UDTF's to prevent the task getting killed because of inactivity. Users should be cautious because this may prevent TaskTracker from killing tasks with infinte infinite loops.

hive.mapred.reduce.tasks.speculative.execution

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The default partition name in case the dynamic partition column value is null/empty string or anyother any other values that cannot be escaped. This value must not contain any special character used in HDFS URI (e.g., ':', '%', '/' etc). The user has to be aware that the dynamic partition value should not contain this value to avoid confusions.

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• Default Value: false
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Whether to throw an excpetion exception if dynamic partition insert generates empty results.

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• Default Value: (empty)
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A list of io I/O exception handler class names. This is used to construct a list of exception handlers to handle exceptions thrown by record readers

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• Default Value: false
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To cleanup the hive scratchdir scratch dir while starting the hive server

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• Default Value: (empty)
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List of comma seperated separated listeners for metastore events.

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• Default Value: 1000
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The number of miliseconds milliseconds between metastore retry attempts

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• Default Value: false
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True When true the hdfs HDFS location stored in the index file will be igbored ignored at runtime. If the data got moved or the name of the cluster got changed, the index data should still be usable.

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If hive is running in test mode, dont don't sample the above comma seperated separated list of tables.