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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/7909/
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(Updated Nov. 9, 2012, 7:02 a.m.)
Review request for hcatalog, Alan Gates and Francis Liu.
Changes
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Incorporated Travis's review comments.
Description
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In 0.4.1, the NotificationListener listens for metastore operations and emits
JMS notifications containing the entire metastore-objects
(Database/Table/Partitions) in Java-serialized form. The assumption at the time
was that consumers might need access to the whole object. This policy poses a
couple of problems:
1. The notifications are verbose, since it conveys a bunch of information
that's available from querying the metastore anyway.
2. Consumers of these JMS notifications (e.g. Oozie) would now be dependent on
the Java class definitions of metastore-objects. If they change, Oozie would
also need to be restarted (with updated libs), to consume the notifications.
Ideally, the notifications should convey only the minimum information that
identifies the metastore-change unambiguously. (Everything else can be queried
for.) They should be backward compatible. If new fields are added, existing
consumers shouldn't break (unless they intend to consume the new fields). Also,
the notification-format ought to be pluggable.
For the initial rework, we're proposing to use a JSON-string to represent the
notification-content. We're also proposing a helper-class for the likes of
Oozie to use, that converts the strings to POJOs, in a backward-compatible
fashion.
This addresses bug HCATALOG-546.
https://issues.apache.org/jira/browse/HCATALOG-546
Diffs (updated)
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http://svn.apache.org/repos/asf/incubator/hcatalog/branches/branch-0.4/src/java/org/apache/hcatalog/common/HCatConstants.java
1406411
http://svn.apache.org/repos/asf/incubator/hcatalog/branches/branch-0.4/src/java/org/apache/hcatalog/listener/NotificationListener.java
1406411
http://svn.apache.org/repos/asf/incubator/hcatalog/branches/branch-0.4/src/java/org/apache/hcatalog/messaging/AddPartitionMessage.java
PRE-CREATION
http://svn.apache.org/repos/asf/incubator/hcatalog/branches/branch-0.4/src/java/org/apache/hcatalog/messaging/CreateDatabaseMessage.java
PRE-CREATION
http://svn.apache.org/repos/asf/incubator/hcatalog/branches/branch-0.4/src/java/org/apache/hcatalog/messaging/CreateTableMessage.java
PRE-CREATION
http://svn.apache.org/repos/asf/incubator/hcatalog/branches/branch-0.4/src/java/org/apache/hcatalog/messaging/DropDatabaseMessage.java
PRE-CREATION
http://svn.apache.org/repos/asf/incubator/hcatalog/branches/branch-0.4/src/java/org/apache/hcatalog/messaging/DropPartitionMessage.java
PRE-CREATION
http://svn.apache.org/repos/asf/incubator/hcatalog/branches/branch-0.4/src/java/org/apache/hcatalog/messaging/DropTableMessage.java
PRE-CREATION
http://svn.apache.org/repos/asf/incubator/hcatalog/branches/branch-0.4/src/java/org/apache/hcatalog/messaging/HCatEventMessage.java
PRE-CREATION
http://svn.apache.org/repos/asf/incubator/hcatalog/branches/branch-0.4/src/java/org/apache/hcatalog/messaging/MessageDeserializer.java
PRE-CREATION
http://svn.apache.org/repos/asf/incubator/hcatalog/branches/branch-0.4/src/java/org/apache/hcatalog/messaging/MessageFactory.java
PRE-CREATION
http://svn.apache.org/repos/asf/incubator/hcatalog/branches/branch-0.4/src/java/org/apache/hcatalog/messaging/jms/MessageHelper.java
PRE-CREATION
http://svn.apache.org/repos/asf/incubator/hcatalog/branches/branch-0.4/src/java/org/apache/hcatalog/messaging/json/JSONAddPartitionMessage.java
PRE-CREATION
http://svn.apache.org/repos/asf/incubator/hcatalog/branches/branch-0.4/src/java/org/apache/hcatalog/messaging/json/JSONCreateDatabaseMessage.java
PRE-CREATION
http://svn.apache.org/repos/asf/incubator/hcatalog/branches/branch-0.4/src/java/org/apache/hcatalog/messaging/json/JSONCreateTableMessage.java
PRE-CREATION
http://svn.apache.org/repos/asf/incubator/hcatalog/branches/branch-0.4/src/java/org/apache/hcatalog/messaging/json/JSONDropDatabaseMessage.java
PRE-CREATION
http://svn.apache.org/repos/asf/incubator/hcatalog/branches/branch-0.4/src/java/org/apache/hcatalog/messaging/json/JSONDropPartitionMessage.java
PRE-CREATION
http://svn.apache.org/repos/asf/incubator/hcatalog/branches/branch-0.4/src/java/org/apache/hcatalog/messaging/json/JSONDropTableMessage.java
PRE-CREATION
http://svn.apache.org/repos/asf/incubator/hcatalog/branches/branch-0.4/src/java/org/apache/hcatalog/messaging/json/JSONMessageDeserializer.java
PRE-CREATION
http://svn.apache.org/repos/asf/incubator/hcatalog/branches/branch-0.4/src/java/org/apache/hcatalog/messaging/json/JSONMessageFactory.java
PRE-CREATION
http://svn.apache.org/repos/asf/incubator/hcatalog/branches/branch-0.4/src/test/org/apache/hcatalog/listener/TestNotificationListener.java
1406411
Diff: https://reviews.apache.org/r/7909/diff/
Testing
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Thanks,
Mithun Radhakrishnan
