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[HIVE-10521] TxnHandler.timeOutTxns only times out some of the expired transactions - Hive - [issue]
...      for (int i = 0; i < 20 && rs.next(); i++) deadTxns.add(rs.getLong(1));      // We don't care whether all of the transactions get dele...
http://issues.apache.org/jira/browse/HIVE-10521    Author: Alan Gates, 2015-05-02, 17:18
Re: ACID ORC file reader issue with uncompacted data - Hive - [mail # user]
...Are you using OrcInputFormat.getReader to get a reader?  If so, it should take care of these anomalies for you and mask your need to worry about delta versus base files.Alan. ...
   Author: Alan Gates, 2015-04-30, 16:41
[HIVE-10500] Repeated deadlocks in underlying RDBMS cause transaction or lock failure - Hive - [issue]
...In some cases in a busy system, deadlocks in the metastore RDBMS can cause failures in Hive locks and transactions when using DbTxnManager...
http://issues.apache.org/jira/browse/HIVE-10500    Author: Alan Gates, 2015-04-29, 09:45
Re: ORC file across multiple HDFS blocks - Hive - [mail # user]
...No, you don't want to be designing ORC files to not cross block boundaries.  Engines in Hadoop (MapReduce, Tez, etc.) are all built to handle the fact that files tend to cross blocks an...
   Author: Alan Gates, 2015-04-27, 18:06
[expand - 1 more] - Re: [DISCUSS] Deprecating Hive CLI - Hive - [mail # dev]
...If I understand correctly this is an argument about usability, not functionality.  So if Hive still had the CLI but it happened to use either HS2 or embedded HS2 (depending on configura...
   Author: Alan Gates, 2015-04-24, 22:39
Re: org.apache.hadoop.hive.ql.lockmgr.LockException: No record of lock could be found, may have timed out - Hive - [mail # user]
...What lock or transaction manager are you using?Alan. ...
   Author: Alan Gates, 2015-04-23, 15:49
[HIVE-10459] Add materialized views to Hive - Hive - [issue]
...Materialized views are useful as ways to store either alternate versions of data (e.g. same data, different sort order) or derivatives of data sets (e.g. commonly used aggregates).  It ...
http://issues.apache.org/jira/browse/HIVE-10459    Author: Alan Gates, 2015-04-23, 05:19
Re: Transactional table read lifecycle - Hive - [mail # user]
...Whether you obtain a read lock depends on the guarantees you want to make to your readers.  Obtaining the lock will do a couple of things your uses might want:1) It will prevent DDL sta...
   Author: Alan Gates, 2015-04-22, 20:07
Re: Orc file and Hive Optimiser - Hive - [mail # user]
...Yes, there is.  Hive is designed around the assumption that you will be doing scans of significant amounts of data, as are most data warehousing type solutions.  It doesn't have th...
   Author: Alan Gates, 2015-04-20, 16:14
[expand - 1 more] - Re: [DISCUSS] Propose reverting HIVE-10304 CLI deprecation message - Hive - [mail # dev]
...To be clear I'm not saying I oppose deprecating it.  I am not sure whether I do or not.  It's a major change and I want to make sure we discuss it and understand if there's any wor...
   Author: Alan Gates, 2015-04-17, 07:25
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB