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https://issues.apache.org/jira/browse/HIVE-1293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15661064#comment-15661064
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Lefty Leverenz commented on HIVE-1293:
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Doc note: This adds several configuration parameters to HiveConf.java:
* hive.lockmgr.zookeeper.default.partition.name
* hive.support.concurrency
* hive.lock.manager
* hive.lock.numretries
* hive.lock.sleep.between.retries
* hive.zookeeper.quorum
* hive.zookeeper.client.port
* hive.zookeeper.session.timeout
They are documented in the wiki here:
* [Configuration Properties -- Locking |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-Locking]
> Concurrency Model for Hive
> --------------------------
>
> Key: HIVE-1293
> URL: https://issues.apache.org/jira/browse/HIVE-1293
> Project: Hive
> Issue Type: New Feature
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Namit Jain
> Fix For: 0.7.0
>
> Attachments: hive.1293.1.patch, hive.1293.2.patch, hive.1293.3.patch,
> hive.1293.4.patch, hive.1293.5.patch, hive.1293.6.patch, hive.1293.7.patch,
> hive.1293.8.patch, hive.1293.9.patch, hive_leases.txt
>
>
> Concurrency model for Hive:
> Currently, hive does not provide a good concurrency model. The only
> guanrantee provided in case of concurrent readers and writers is that
> reader will not see partial data from the old version (before the write) and
> partial data from the new version (after the write).
> This has come across as a big problem, specially for background processes
> performing maintenance operations.
> The following possible solutions come to mind.
> 1. Locks: Acquire read/write locks - they can be acquired at the beginning of
> the query or the write locks can be delayed till move
> task (when the directory is actually moved). Care needs to be taken for
> deadlocks.
> 2. Versioning: The writer can create a new version if the current version is
> being read. Note that, it is not equivalent to snapshots,
> the old version can only be accessed by the current readers, and will be
> deleted when all of them have finished.
> Comments.
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