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From Phil Yang <ud1...@gmail.com>
Subject Re: [ANNOUNCE] Asynchronous client is available in HBase 2.0
Date Fri, 21 Jul 2017 09:21:17 GMT
I filed an issue HBASE-18334
<https://issues.apache.org/jira/browse/HBASE-18334> to remove the old sync
implementation. I think we can do it in 3.0 and keep sync logic in
branch-2? Of course we can also remove it in 2.1 or higher 2.x branch but
if we remove it since 2.0 it may be a little radical  :)

Thanks,
Phil


2017-07-21 6:15 GMT+08:00 Stack <stack@duboce.net>:

> Very sweet Guanghao. Thanks for all the hard work (you, Duo and all who
> contributed to the async work).
>
> When you think we should move the sync client to be on top of the async
> chassis?
>
> Thanks,
> St.Ack
>
> P.S. It looks like you updated its status in this doc,
> https://docs.google.com/document/d/1WCsVlnHjJeKUcl7wHwqb4z9iEu_
> ktczrlKHK8N4SZzs/edit#,
> thanks.
>
> On Thu, Jul 20, 2017 at 4:51 AM, Guanghao Zhang <zghaobac@gmail.com>
> wrote:
>
> > Dear all,
> >
> > Asynchronous client aims to provide the ability to access HBase
> > asynchronously. You can obtain an AsyncConnection from ConnectionFactory,
> > and then get an asynchronous table instance (for DML operations) or an
> > asynchronous admin instance (for DDL operations) from it to access HBase.
> > For the asynchronous table or admin, most methods have the same meaning
> > with the old Table or Admin interface, expect that the return value is
> > wrapped with a CompletableFuture (java 8 or higher is required) usually.
> > You can get more details from the documentation[1][2].
> >
> > There are two examples about the asynchronous client.
> AsyncClientExample[3]
> > is a simple example to show you how to use AsyncTable.
> HttpProxyExample[4]
> > is an example for advance user to show you how to use RawAsyncTable to
> > write a fully asynchronous HTTP proxy server. Welcome to try the
> > asynchronous client in your project.
> >
> > We tested the performance of asynchronous client by
> > the PerformanceEvaluation tool. And it showed that async client has
> almost
> > same latency with sync client[5]. Notice: when we did performance test
> for
> > asynchronous client. We found some performance issue when use jdk
> 1.8_111.
> > And it was fixed when use jdk 1.8_131 [6]. So suggest use a bigger
> version
> > than jdk8_131 when you use the asynchronous client.
> >
> > The major umbrella issues include:
> > HBASE-16432 Revisit the asynchronous ipc implementation[7]
> > HBASE-16833 Implement asynchronous hbase client based on HBASE-15921[8]
> > HBASE-17359 Implement async admin[9]
> >
> > There is also an issue HBASE-17856 to track the further improvements for
> > asynchronous hbase client[10].
> >
> > Finally, thanks Duo Zhang and Zheng Hu who worked with me together to
> > implement the asynchronous client.
> >
> > Best Regards,
> > Guanghao
> >
> > [1] https://hbase.apache.org/book.html#async.client
> > [2] https://hbase.apache.org/book.html#async.admin
> > [3]
> > https://github.com/apache/hbase/blob/master/hbase-
> > examples/src/main/java/org/apache/hadoop/hbase/client/
> > example/AsyncClientExample.java
> > [4]
> > https://github.com/apache/hbase/blob/master/hbase-
> > examples/src/main/java/org/apache/hadoop/hbase/client/
> > example/HttpProxyExample.java
> > [5] https://www.slideshare.net/HBaseCon/hbase-at-xiaomi
> > [6]
> > http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/share/
> > classes/java/util/concurrent/CompletableFuture.java
> > [7] https://issues.apache.org/jira/browse/HBASE-16432
> > [8] https://issues.apache.org/jira/browse/HBASE-16833
> > [9] https://issues.apache.org/jira/browse/HBASE-17359
> > [10] https://issues.apache.org/jira/browse/HBASE-17856
> >
>

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