Hive Support Concurrency

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Locking - Apache Hive - Apache Software Foundation

    https://cwiki.apache.org/confluence/display/Hive/Locking
    The default Hive behavior will not be changed, and concurrency will not be supported. Turn Off Concurrency. You can turn off concurrency by setting the following variable to false: hive.support.concurrency. Debugging. You can see the locks on a table by issuing the following command: SHOW LOCKS <TABLE_NAME>; SHOW LOCKS <TABLE_NAME> EXTENDED;Lock Compatibility: Existing Lock

Configuration Properties - Apache Hive - Apache Software ...

    https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties
    Configuration properties prefixed by 'hikari' or 'dbcp' will be propagated as is to the connectionpool implementation by Hive. Jdbc connection url, username, password and connection pool maximum connections are exceptions which must be configured with their special Hive Metastore configuration properties.

ACID Transactions - Transactions in Hive Hive Tutorial

    https://acadgild.com/blog/acid-transactions-in-hive
    In this blog post, we have explained about the row-level transactions available in Hive. This post will provide you a good idea of how to implement the row-level transactions on the Hive table.. Before beginning with the transactions in Hive, let’s look at the ACID properties, which are vital for any transaction.

[Hive-user] Hive Concurrency support - Grokbase

    https://grokbase.com/t/hive/user/158n0vtdwj/hive-concurrency-support
    Aug 21, 2015 · Elliot West I presume you mean "into different partitions of a table at the same time"? This should be possible. It is certainly supported by the streaming API, which is probably where you want to look if you need to insert large volumes …

[Hive-user] Hive server concurrency question - Grokbase

    https://grokbase.com/t/hive/user/123vbezvb7/hive-server-concurrency-question
    Mar 27, 2012 · Abhishek Pratap Singh AFAIK hive does not support concurrency however Multiple connection can be made to HiveServer. Hive or i should say Hadoop is write once and read multiple architecture. Hive does not have a build in support for DELETE OR UPDATE.

odbc - Hive Update and Delete - Stack Overflow

    https://stackoverflow.com/questions/30556396/hive-update-and-delete
    These configuration parameters must be set appropriately to turn on transaction support in Hive: hive.support.concurrency – true hive.enforce.bucketing – true hive.exec.dynamic.partition.mode – nonstrict hive.txn.manager – org.apache.hadoop.hive.ql.lockmgr.DbTxnManager hive.compactor.initiator.on – true (for …

How Table Locking Works in Hive – Hadoop Troubleshooting ...

    https://www.ericlin.me/2015/05/how-table-locking-works-in-hive/
    1. hive.support.concurrency is not set to “true” ... Cloudera still considers this feature is experimental and currently does not support ACID in CDH. Normally currently users do not use manual locking on Hive tables, because Hive queries themselves will take care of that automatically. However, if user decides for whatever reason, he/she ...

what is the behaviour of select during an insert in HIVE ...

    https://community.cloudera.com/t5/Support-Questions/what-is-the-behaviour-of-select-during-an-insert-in-HIVE/td-p/182443
    Hi, In my organization, Hive is used with the hive.support.concurrency setted to false. I am wondering what are the consequences about inserting datas during a select (and vice versa). At insert, I think the table's metadatas are updated at the very end of the Map/Reduce job. Thus, a select should b...

[HIVE-9169] UT: set hive.support.concurrency to true for ...

    https://issues.apache.org/jira/browse/HIVE-9169
    The test cases lock1 lock2 lock3 lock4 are failing because the flag hive.support.concurrency is set to false in the hive-site.xml for the spark tests. This value was set to true in trunk with HIVE-1293 when these test cases were introduced to Hive. After setting the value to true and generating the output files, the test cases are successful.



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