commit | 10aa6e9906b74905043b50cc6422e1ef42b894f5 | [log] [tgz] |
---|---|---|
author | QiangCai <qiangcai@qq.com> | Wed Jun 24 15:19:26 2020 +0800 |
committer | ajantha-bhat <ajanthabhat@gmail.com> | Sun Jun 28 08:02:23 2020 +0530 |
tree | 1a3e33895bcccd0337e6ee010ce9a0812d5f5cbf | |
parent | 3663760ec630c7ceaabc5c5e81fc891e5e07d997 [diff] |
[CARBONDATA-3870] Optimize global lock to object lock for CarbonEnv.init Why is this PR needed? global lock of CarbonEnv.init impacts the performance of the concurrent query with multiple SparkSession. What changes were proposed in this PR? Optimize global lock to object lock for CarbonEnv.init The global lock is only used to create CarbonEnv(not include init). Does this PR introduce any user interface change? No Is any new testcase added? No, derby only support one connection at a time, we can't create multiple sessions to connect a same derby metastore. This closes #3805
Apache CarbonData is an indexed columnar data store solution for fast analytics on big data platform, e.g.Apache Hadoop, Apache Spark, etc.
You can find the latest CarbonData document and learn more at: http://carbondata.apache.org
CarbonData file format is a columnar store in HDFS, it has many features that a modern columnar format has, such as splittable, compression schema ,complex data type etc, and CarbonData has following unique features:
CarbonData is built using Apache Maven, to build CarbonData
Some features are marked as experimental because the syntax/implementation might change in the future.
This is an active open source project for everyone, and we are always open to people who want to use this system or contribute to it. This guide document introduce how to contribute to CarbonData.
To get involved in CarbonData:
Apache CarbonData is an open source project of The Apache Software Foundation (ASF).