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From Ryan Rawson <ryano...@gmail.com>
Subject Re: retrieving timestamp from Result
Date Mon, 15 Nov 2010 22:12:13 GMT
The javadoc details what to expect.

You can also call Result.getColumnLatest(byte[],byte[])

The resulting KeyValue has methods like getTimestamp() etc.

-ryan


On Mon, Nov 15, 2010 at 2:02 PM, Ted Yu <yuzhihong@gmail.com> wrote:
> We used the following code to see if the "Cell" (pardon me for using the old
> term) returned from scanner was of certain timestamp:
>            if (result.getCellValue().getTimestamp() == ts){
>
> In 0.90, I don't see method which returns the timestamp for Result.
> I am wondering if the above check can be omitted since we specify the
> following for the Scan:
>        scan.setTimeStamp(ts);
> If not, please advise the correct way of retrieving timestamp from Result.
>
> If I call Result.raw() and get two KeyValue's, which should be the KeyValue
> whose timestamp conforms to the semantics of our check shown at the top ?
>
> Thanks
>
> On Mon, Nov 15, 2010 at 12:38 PM, Ryan Rawson <ryanobjc@gmail.com> wrote:
>
>> That is correct, those classes were deprecated in 0.20, and now gone in
>> 0.90.
>>
>> Now you will want to use HTable and Result.
>>
>> Also Filter.getNextKeyHint() is an implementation detail, have a look
>> at the other filters to get a sense of what it does.
>>
>> On Mon, Nov 15, 2010 at 12:33 PM, Ted Yu <yuzhihong@gmail.com> wrote:
>> > Just a few findings when I tried to compile our 0.20.6 based code with
>> this
>> > new release:
>> >
>> > HConstants is final class now instead of interface
>> > RowFilterInterface is gone
>> > org.apache.hadoop.hbase.io.Cell is gone
>> > org.apache.hadoop.hbase.io.RowResult is gone
>> > constructor
>> >
>> HColumnDescriptor(byte[],int,java.lang.String,boolean,boolean,int,boolean)
>> > is gone
>> > Put.setTimeStamp() is gone
>> > org.apache.hadoop.hbase.filter.Filter has added
>> > getNextKeyHint(org.apache.hadoop.hbase.KeyValue)
>> >
>> > If you know the alternative to some of the old classes, please share.
>> >
>> > On Mon, Nov 15, 2010 at 2:51 AM, Stack <stack@duboce.net> wrote:
>> >
>> >> The first hbase 0.90.0 release candidate is available for download:
>> >>
>> >>  http://people.apache.org/~stack/hbase-0.90.0-candidate-0/<http://people.apache.org/%7Estack/hbase-0.90.0-candidate-0/>
>> <http://people.apache.org/%7Estack/hbase-0.90.0-candidate-0/>
>> >>
>> >> HBase 0.90.0 is the major HBase release that follows 0.20.0 and the
>> >> fruit of the 0.89.x development release series we've been running of
>> >> late.
>> >>
>> >> More than 920 issues have been closed since 0.20.0.  Release notes are
>> >> available here: http://su.pr/8LbgvK.
>> >>
>> >> HBase 0.90.0 runs on Hadoop 0.20.x.  It does not currently run on
>> >> Hadoop 0.21.0.   HBase will lose data unless it is running on an
>> >> Hadoop HDFS 0.20.x that has a durable sync. Currently only the
>> >> branch-0.20-append branch [1] has this attribute. No official releases
>> >> have been made from this branch as yet so you will have to build your
>> >> own Hadoop from the tip of this branch or install Cloudera's CDH3 [2]
>> >> (Its currently in beta).  CDH3b2 or CDHb3 have the 0.20-append patches
>> >> needed to add a durable sync. See CHANGES.txt [3] in
>> >> branch-0.20-append to see list of patches involved.
>> >>
>> >> There is no migration necessary.  Your data written with HBase 0.20.x
>> >> (or with HBase 0.89.x) is readable by HBase 0.90.0.  A shutdown and
>> >> restart after putting in place the new HBase should be all thats
>> >> involved.  That said, once done, there is no going back to 0.20.x once
>> >> the transition has been made.   HBase 0.90.0 and HBase 0.89.x write
>> >> region names differently in the filesystem.  Rolling restart from
>> >> 0.20.x or 0.89.x to 0.90.0RC0 will not work.
>> >>
>> >> Should we release this candidate as hbase 0.90.0?  Take it for a spin.
>> >>  Check out the doc.  Vote +1/-1 by November 22nd.
>> >>
>> >> Yours,
>> >> The HBasistas
>> >> P.S. For why the version 0.90 and whats new in HBase 0.90, see slides
>> >> 4-10 in this deck [4]
>> >>
>> >> 1.
>> http://svn.apache.org/viewvc/hadoop/common/branches/branch-0.20-append
>> >> 2. http://archive.cloudera.com/docs/
>> >> 3.
>> >>
>> http://svn.apache.org/viewvc/hadoop/common/branches/branch-0.20-append/CHANGES.txt
>> >> 4. http://hbaseblog.com/2010/07/04/hug11-hbase-0-90-preview-wrap-up/
>> >>
>> >
>>
>

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