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From "jiraposter@reviews.apache.org (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-965) Need a multi-update command to allow multiple znodes to be updated safely
Date Wed, 25 May 2011 06:56:47 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13038986#comment-13038986

jiraposter@reviews.apache.org commented on ZOOKEEPER-965:

bq.  On 2011-05-21 02:00:22, Ted Dunning wrote:
bq.  > src/java/main/org/apache/zookeeper/ZooKeeper.java, line 801
bq.  > <https://reviews.apache.org/r/739/diff/4/?file=19427#file19427line801>
bq.  >
bq.  >     What would you say about deferring this to a separate JIRA?

Does the separate JIRA you created address both of Benjamin's async requests? I think he wanted
an async multi method as well as an async commit method...?

- Marshall

This is an automatically generated e-mail. To reply, visit:

On 2011-05-19 02:13:14, Ted Dunning wrote:
bq.  -----------------------------------------------------------
bq.  This is an automatically generated e-mail. To reply, visit:
bq.  https://reviews.apache.org/r/739/
bq.  -----------------------------------------------------------
bq.  (Updated 2011-05-19 02:13:14)
bq.  Review request for zookeeper and Benjamin Reed.
bq.  Summary
bq.  -------
bq.  This mega-patch adds the multi-op capability to ZK.  This allows a batch of create, delete,
update or version-check operations to 
bq.  succeed or fail together.   Both C and java bindings are provided.
bq.  This addresses bug ZOOKEEPER-965.
bq.      https://issues.apache.org/jira/browse/ZOOKEEPER-965
bq.  Diffs
bq.  -----
bq.    src/c/Makefile.am 65830fe 
bq.    src/c/include/proto.h 843032f 
bq.    src/c/include/zookeeper.h c055edb 
bq.    src/c/src/zookeeper.c db715b0 
bq.    src/c/tests/TestMulti.cc PRE-CREATION 
bq.    src/c/tests/TestOperations.cc f9441ea 
bq.    src/c/tests/ZKMocks.cc a75dce6 
bq.    src/java/main/org/apache/zookeeper/MultiResponse.java PRE-CREATION 
bq.    src/java/main/org/apache/zookeeper/MultiTransactionRecord.java PRE-CREATION 
bq.    src/java/main/org/apache/zookeeper/Op.java PRE-CREATION 
bq.    src/java/main/org/apache/zookeeper/OpResult.java PRE-CREATION 
bq.    src/java/main/org/apache/zookeeper/Transaction.java PRE-CREATION 
bq.    src/java/main/org/apache/zookeeper/ZooDefs.java 832976f 
bq.    src/java/main/org/apache/zookeeper/ZooKeeper.java 00b4012 
bq.    src/java/main/org/apache/zookeeper/server/DataTree.java d16537e 
bq.    src/java/main/org/apache/zookeeper/server/FinalRequestProcessor.java 2538cf7 
bq.    src/java/main/org/apache/zookeeper/server/PrepRequestProcessor.java 50f208d 
bq.    src/java/main/org/apache/zookeeper/server/Request.java a5c57e2 
bq.    src/java/main/org/apache/zookeeper/server/RequestProcessor.java 5c3e8ff 
bq.    src/java/main/org/apache/zookeeper/server/TraceFormatter.java 8ece929 
bq.    src/java/main/org/apache/zookeeper/server/package.html 3ec7656 
bq.    src/java/main/org/apache/zookeeper/server/quorum/CommitProcessor.java 49affd5 
bq.    src/java/main/org/apache/zookeeper/server/util/SerializeUtils.java 0ad4dd6 
bq.    src/java/test/org/apache/zookeeper/MultiResponseTest.java PRE-CREATION 
bq.    src/java/test/org/apache/zookeeper/MultiTransactionRecordTest.java PRE-CREATION 
bq.    src/java/test/org/apache/zookeeper/test/MultiTransactionTest.java PRE-CREATION 
bq.    src/zookeeper.jute 7d96f32 
bq.  Diff: https://reviews.apache.org/r/739/diff
bq.  Testing
bq.  -------
bq.  A number of unit tests have been implemented.  Test coverage is very good.
bq.  A sample application has been written to do simple operations on a graph of nodes.
bq.  Thanks,
bq.  Ted

> Need a multi-update command to allow multiple znodes to be updated safely
> -------------------------------------------------------------------------
>                 Key: ZOOKEEPER-965
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-965
>             Project: ZooKeeper
>          Issue Type: Bug
>    Affects Versions: 3.3.3
>            Reporter: Ted Dunning
>            Assignee: Ted Dunning
>             Fix For: 3.4.0
>         Attachments: ZOOKEEPER-965.patch, ZOOKEEPER-965.patch, ZOOKEEPER-965.patch, ZOOKEEPER-965.patch,
ZOOKEEPER-965.patch, ZOOKEEPER-965.patch, ZOOKEEPER-965.patch, ZOOKEEPER-965.patch, ZOOKEEPER-965.patch,
ZOOKEEPER-965.patch, ZOOKEEPER-965.patch, ZOOKEEPER-965.patch, ZOOKEEPER-965.patch, ZOOKEEPER-965.patch
> The basic idea is to have a single method called "multi" that will accept a list of create,
delete, update or check objects each of which has a desired version or file state in the case
of create.  If all of the version and existence constraints can be satisfied, then all updates
will be done atomically.
> Two API styles have been suggested.  One has a list as above and the other style has
a "Transaction" that allows builder-like methods to build a set of updates and a commit method
to finalize the transaction.  This can trivially be reduced to the first kind of API so the
list based API style should be considered the primitive and the builder style should be implemented
as syntactic sugar.
> The total size of all the data in all updates and creates in a single transaction should
be limited to 1MB.
> Implementation-wise this capability can be done using standard ZK internals.  The changes
> - update to ZK clients to all the new call
> - additional wire level request
> - on the server, in the code that converts transactions to idempotent form, the code
should be slightly extended to convert a list of operations to idempotent form.
> - on the client, a down-rev server that rejects the multi-update should be detected gracefully
and an informative exception should be thrown.
> To facilitate shared development, I have established a github repository at https://github.com/tdunning/zookeeper
 and am happy to extend committer status to anyone who agrees to donate their code back to
Apache.  The final patch will be attached to this bug as normal.

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