A quantity used to share sampling. By switching this quantity, person will change the subsets of data sampled.
Amount of threads utilized by partialscan/noscan examine command for partitioned tables. This really is relevant only for file formats that implement the StatsProvidingRecordReader interface (like ORC).
When configuring the max link pool size, it is recommended to take into account the number of metastore scenarios and the amount of HiveServer2 cases
Quantity of aborted transactions involving a supplied desk or partition that should trigger a major compaction.
Utmost amount of rows permitted for a smaller sized subset of knowledge for easy Restrict, if it is a fetch query. Insert queries will not be limited by this Restrict.
LDAP relationship URL(s), worth could possibly be a SPACE divided list of URLs to multiple LDAP servers for resiliency. URLs are experimented with within the order specified until finally the connection is successful.
Whether or not Hive must mechanically mail progress information and facts to TaskTracker when employing UDTF's to avoid the job receiving killed as a consequence of inactivity. People really should be cautious simply because this could reduce TaskTracker from killing responsibilities with infinite loops.
For conditional joins, if enter stream from a little alias might be right applied to the join operator without filtering or projection, the alias need not be pre-staged inside the dispersed cache through a mapred local task. At present, this isn't dealing with vectorization check out here or Tez execution engine.
By default Tez will spawn containers of the scale of a mapper. This may be utilized to overwrite the default.
Decide the number of map activity at most Employed in the additional info abide by up map be part of task for any skew join by specifying the minimum amount split measurement. It should be made use of together with hive.skewjoin.mapjoin.map.jobs to complete a good grained control.
Some select queries may be converted to only one FETCH endeavor, reducing latency. At the moment the query needs to be single sourced not having any subquery and may not have any aggregations or distincts (which incur RS – ReduceSinkOperator, necessitating a MapReduce activity), lateral views and joins.
Thrift won't assist nulls in maps, so any nulls current in maps retrieved from object-relational mapping (ORM) needs to be both pruned or converted to vacant strings.
Keytab file for SPNEGO principal, optional. An average worth would seem like /and so forth/security/keytabs/spnego.
Annotation from the operator tree with statistics facts requires partition stage simple statistics like number of rows, info sizing and file size. Partition statistics are fetched through the metastore. Fetching partition statistics for every needed partition may be high priced in the event the quantity of partitions is substantial.