-Re: AsyncHBase 1.5.0-rc1 available for download and testing (HBase 0.96 compatibility inside)
Viral Bajaria 2013-12-03, 06:36
Depends on what version of HBase you are using. If you are using HBase
0.95+, with 1.5.0 asynchbase you will be able to use any filters that exist
in HBase. Though you might need to add the required classes since
asynchbase needs them to serialize to the old RPC protocol for < 0.95 and
uses protobufs for versions > 0.95.
On Mon, Dec 2, 2013 at 9:04 PM, ripsacCTO <[EMAIL PROTECTED]> wrote:
> Hi Tsuna,
> Just wanted to know , if there is any way of Scanning using column value
> and with filters on column value.
> Eg. Suppose I have column values against qualifier waterlevel as
> 40,20,30,10 etc.
> *If my requirement is like that I want to fetch data with requirement like
> give me data with water level > 20.*
> Is such a query possible. Please suggest some examples.
> Does the latest version of asyncbase support the above ? If yes , please
> suggest with some example code base.
> Thanks in advance.
> On Tuesday, October 29, 2013 10:27:13 AM UTC+5:30, tsuna wrote:
>> Hi all,
>> The first release candidate of AsyncHBase "post-singularity" is now
>> available for download. AsyncHBase remains true to its initial
>> promise: the API is still backward compatible, but under the hood it
>> continues to work with all production releases of HBase of the past
>> few years.
>> This release was tested against HBase 0.89, 0.90, 0.92, 0.94, and
>> 0.96. While 0.2x probably still works, I didn't take the time to test
>> it, because… well, really, you shouldn't be using such ancient version
>> of HBase. Really.
>> The Maven build was broken by the addition of protobufs in the build
>> process. Any Maven fans out there who would like to help fix it?
>> Without it I can't easily publish new artifacts to Maven repo.
>> Here is the relevant excerpt of the NEWS file:
>> This release introduces compatibility with HBase 0.96 and up, and adds
>> a dependency on Google's protobuf-java library. Note that HBase 0.95.x,
>> which was a "developer preview" release train, is NOT supported.
>> Please note that support for explicit row locks has been removed from
>> HBase 0.95 and up. While the classes and functionality remain usable
>> when using earlier versions of HBase, an `UnsupportedOperationException'
>> will be raised if one attempt to send a `RowLockRequest' to a newer
>> version of HBase.
>> Please note that while AsyncHBase never made any guarantees about the
>> exact order in which multiple edits are applied within a batch, the order
>> is now different when talking to HBase 0.96 and up.
>> New public APIs:
>> - Scanners can now use a variety of different filters via the new
>> `ScanFilter' interfaces and its various implementations.
>> - It's possible to specify specific families to scan via `setFamilies'.
>> - Scanners can put an upper bound on the amount of data fetched by RPC
>> via the new `setMaxNumKeyValues' (works with HBase 0.96 and up only).
>> - HBaseRpc now has a `failfast()' and a `setFailfast(boolean)' pair
>> of methods to allow RPCs to fail as soon as their encounter an
>> issue out of the ordinary (e.g. not just a `NotSuchRegionException').
>> - `GetRequest' has additional constructor overloads that make its API
>> more uniform with that of other RPCs.
>> Noteworthy bug fixes:
>> - DeleteRequest wasn't honoring its timestamp if one was given (#58).
>> - When a connection attempt fails, buffered RPCs weren't cleaned up
>> or retried properly.
>> - When one RPC fails because of another one (e.g. we fail to send an
>> RPC because a META lookup failed), the asynchronous exception that
>> is given to the callback now properly carries the original RPC that
>> - There was an unlikely race condition that could cause an NPE while
>> trying to retrieve the ROOT region from ZooKeeper.
>> Pre-compiled JAR: http://tsunanet.net/~tsuna/asynchbase/asynchbase-1.5.0-
>> Source: https://github.com/tsuna/asynchbase