Online crudhasone Association query reports an error unabletouseinternalvariable:list

Next, I will introduce in detail Apache Hive 2.1 Optimization that is critical to performance improvement ：LLAP.LLAP yes “Live Long and Process” Abbreviation , It introduces a distributed persistent query service , Combined with the optimized data caching mechanism , It can quickly start query calculation jobs and avoid unnecessary disks IO operation . In short ,LLAP Is the next generation distributed computing architecture , It can intelligently cache data into the memory of multiple machines , And allow all clients to share these cached data , At the same time, it retains the flexibility .

among ,Type1 Has been Apache hadoop The ecosystem proves that its performance will not be too high , thus Hive Go straight into Type2, At present Type2 All features in are well supported , Including distributed memory management and optimization , Memory data sharing, etc . Besides ,Apache Hive Performance is being further optimized , Including support for new storage media Flash, Expand LLAP Ability , It can directly process compressed data without decompressing in advance .

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