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https://issues.apache.org/jira/browse/HIVE-2038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13018877#comment-13018877
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jirapos...@reviews.apache.org commented on HIVE-2038:
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bq. On 2011-04-12 03:07:54, Carl Steinbach wrote:
bq. >
trunk/metastore/src/java/org/apache/hadoop/hive/metastore/ObjectStore.java,
line 999
bq. > <https://reviews.apache.org/r/581/diff/1/?file=15625#file15625line999>
bq. >
bq. > Unrelated bugfix?
Related bugfix, I will say : ) Without it, when drop partition returns from
object store, partition object doesn't contain partition values.
bq. On 2011-04-12 03:07:54, Carl Steinbach wrote:
bq. > trunk/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java, line 180
bq. > <https://reviews.apache.org/r/581/diff/1/?file=15621#file15621line180>
bq. >
bq. > Please add this property to hive-default.xml along with a
description of what it does.
bq. >
Will add it in hive-default.xml.
bq. On 2011-04-12 03:07:54, Carl Steinbach wrote:
bq. >
trunk/metastore/src/java/org/apache/hadoop/hive/metastore/HiveMetaStore.java,
line 955
bq. > <https://reviews.apache.org/r/581/diff/1/?file=15622#file15622line955>
bq. >
bq. > Please run checkstyle and correct any violations included in your
patch.
Will run checkstyle to check for any style violations.
bq. On 2011-04-12 03:07:54, Carl Steinbach wrote:
bq. >
trunk/metastore/src/java/org/apache/hadoop/hive/metastore/MetaStoreListener.java,
line 27
bq. > <https://reviews.apache.org/r/581/diff/1/?file=15623#file15623line27>
bq. >
bq. > Please add some javadoc explaining the intended use of this
interface.
bq. >
bq. > * Are the methods called before or after an action completes? What
happens if a metastore operation fails?
bq. >
bq. > * Are the methods allowed to block? Are they run in a separate
thread?
bq. >
bq. > * Are the methods allowed to modify the catalog objects that are
passed in as parameters?
Will also add in javadoc.
* Methods are called after action completes. Only if action succeeds. They are
not called if operation fails since in that case nothing has actually changed
in metastore.
* This is upto implementation. They can run in same thread, or they can
schedule there work in separate thread and return immediately.
* I don't see a reason to disallow modification of passed in parameter
objects. But, its mostly irrelevant here since methods are called after change
has already been persisted on metastore. So, modifying these objects can't
change any state on metastore.
bq. On 2011-04-12 03:07:54, Carl Steinbach wrote:
bq. >
trunk/metastore/src/java/org/apache/hadoop/hive/metastore/MetaStoreListener.java,
line 29
bq. > <https://reviews.apache.org/r/581/diff/1/?file=15623#file15623line29>
bq. >
bq. > Instead of passing in raw Table/Partition/Database objects it may be
better to instead wrap these objects in containers, e.g. CreateTableEvent,
DropTableEvent, etc. Eventually this interface will probably include
onAlterTable() and onAlterPartition(), and programmers will probably want to
access both the before and after versions of a Table/Partition, etc.
Whats the advantage of wrapper container objects?
bq. On 2011-04-12 03:07:54, Carl Steinbach wrote:
bq. >
trunk/metastore/src/java/org/apache/hadoop/hive/metastore/HiveMetaStore.java,
line 1446
bq. > <https://reviews.apache.org/r/581/diff/1/?file=15622#file15622line1446>
bq. >
bq. > No need to reference "this", right?
Right. Though, I think using "this" in such cases improves code readability.
bq. On 2011-04-12 03:07:54, Carl Steinbach wrote:
bq. >
trunk/metastore/src/java/org/apache/hadoop/hive/metastore/MetaStoreListener.java,
line 26
bq. > <https://reviews.apache.org/r/581/diff/1/?file=15623#file15623line26>
bq. >
bq. > What do you think about changing the name to MetaStoreEventListener
or CatalogEventListener?
MetaStoreEventListener is fine too.
- Ashutosh
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/581/#review428
-----------------------------------------------------------
On 2011-04-12 01:29:41, Ashutosh Chauhan wrote:
bq.
bq. -----------------------------------------------------------
bq. This is an automatically generated e-mail. To reply, visit:
bq. https://reviews.apache.org/r/581/
bq. -----------------------------------------------------------
bq.
bq. (Updated 2011-04-12 01:29:41)
bq.
bq.
bq. Review request for hive, Carl Steinbach, John Sichi, and Paul Yang.
bq.
bq.
bq. Summary
bq. -------
bq.
bq. Review request for HIVE-2038
bq.
bq.
bq. This addresses bug HIVE-2038.
bq. https://issues.apache.org/jira/browse/HIVE-2038
bq.
bq.
bq. Diffs
bq. -----
bq.
bq. trunk/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java 1079575
bq.
trunk/metastore/src/java/org/apache/hadoop/hive/metastore/HiveMetaStore.java
1079575
bq.
trunk/metastore/src/java/org/apache/hadoop/hive/metastore/MetaStoreListener.java
PRE-CREATION
bq.
trunk/metastore/src/java/org/apache/hadoop/hive/metastore/NoOpListener.java
PRE-CREATION
bq.
trunk/metastore/src/java/org/apache/hadoop/hive/metastore/ObjectStore.java
1079575
bq.
trunk/metastore/src/test/org/apache/hadoop/hive/metastore/DummyListener.java
PRE-CREATION
bq.
trunk/metastore/src/test/org/apache/hadoop/hive/metastore/TestMetaStoreListener.java
PRE-CREATION
bq.
bq. Diff: https://reviews.apache.org/r/581/diff
bq.
bq.
bq. Testing
bq. -------
bq.
bq. Unit test with dummy listener included. Also tested with an alternate
listener which sends a message on a message bus.
bq.
bq.
bq. Thanks,
bq.
bq. Ashutosh
bq.
bq.
> Metastore listener
> ------------------
>
> Key: HIVE-2038
> URL: https://issues.apache.org/jira/browse/HIVE-2038
> Project: Hive
> Issue Type: Improvement
> Components: Metastore
> Reporter: Ashutosh Chauhan
> Assignee: Ashutosh Chauhan
> Fix For: 0.8.0
>
> Attachments: hive-2038.patch, metastore_listener.patch,
> metastore_listener.patch, metastore_listener.patch
>
>
> Provide to way to observe changes happening on Metastore
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