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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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/ >> >> >> > >> >
