By default, the cache that ORC enter structure works by using to retail outlet the ORC file footer takes advantage of challenging references to the cached object. Environment this to correct can help keep away from out-of-memory concerns beneath memory strain (in some instances) at the expense of slight unpredictability in Total query functionality.
Determine the encoding technique to use although composing details. Shifting this may only have an effect on the light pounds encoding for integers. This flag won't change the compression amount of higher stage compression codec (like ZLIB). Feasible possibilities are Pace and COMPRESSION.
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No matter if to rewrite count distinct into two phases, i.e., the 1st stage makes use of various reducers Using the depend distinctive key and the second phase takes advantage of a single reducer without having vital.
For TDE with exact same encryption keys on source and target, let Distcp Tremendous user to entry the Uncooked bytes from filesystem without decrypting on source and then encrypting on goal.
This flag need to be set to accurate to help use of native fast vector map be part of hash tables in queries applying MapJoin.
Figure out if we obtain a skew important in join. If we see much more than the required variety of rows Using the exact vital in be a part of blog here operator, we expect The real key for a skew join key.
By default, the cache that ORC enter format uses to shop the ORC file footer uses difficult references to the cached item. Placing this to real can help stay clear of out-of-memory challenges below memory pressure (sometimes) at the price of slight unpredictability in In general query effectiveness.
Thrift would not assist nulls in maps, so any nulls present in maps retrieved from object-relational mapping (ORM) needs to be either pruned or converted to vacant strings.
Utmost number of bytes a script is permitted to emit to straightforward mistake (for each map-decrease endeavor). This stops runaway scripts from filling logs partitions to capacity.
Most quantity of retries when stats publisher/aggregator received an exception updating intermediate database. Default is not any attempts on failures.
Highest quantity of reducers that will be applied. In case the a single laid out in the configuration residence mapred.minimize.tasks is detrimental, Hive will use this as the utmost range of reducers when mechanically identifying the volume of reducers.
Established this into a highest quantity of threads that Hive will use to checklist file info from file systems, which include file dimensions and variety of files for each desk (encouraged > 1 for blobstore).
Establishes the amount of compaction data in condition 'did not initiate' will be retained in compaction history for a specified desk/partition.