[
https://issues.apache.org/jira/browse/HIVE-1293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12901609#action_12901609
]
John Sichi commented on HIVE-1293:
----------------------------------
Oops, ant test is giving me this build error:
[javac]
/data/users/jsichi/open/commit-trunk/ql/src/test/org/apache/hadoop/hive/ql/QTestUtil.java:939:
cannot find symbol
[javac] symbol : class MiniZooKeeperCluster
[javac] location: class org.apache.hadoop.hive.ql.QTestUtil.QTestSetup
[javac] private MiniZooKeeperCluster zooKeeperCluster = null;
[javac] ^
I had only moved zookeeper-3.2.2.jar from hbase-handler/lib to top-level lib
(but not the hbase-*.jar). I guess we need to move all of them.
> Concurrency Model for Hive
> --------------------------
>
> Key: HIVE-1293
> URL: https://issues.apache.org/jira/browse/HIVE-1293
> Project: Hadoop 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.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
