get(row, column) is more efficient than get(row) because get(row) must access
multiple HStores and do multiple reads while get(row, column) only accesses one
HStore.
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Jim Kellerman, Senior Engineer; Powerset
> -Original Message-
> From: Daniel [mailto:[EMAIL PROTECTED]
> Sent: Tuesd
In HBase-0.1.x, you cannot get the timestamps. In trunk (0.2.0) you will.
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Jim Kellerman, Senior Engineer; Powerset
> -Original Message-
> From: Yair Even-Zohar [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, July 15, 2008 8:05 AM
> To: hbase-user@hadoop.apache.org
> Subject: Adding versio
I got several questions:
1) Can we retrieve the timestamp for a given version for a data
point in a column? I see in the documentation that HTable.get() may
return array of versions but I don't see how to get the extract the
timestamp for each version.
2) Did anyone code a mapReduc
Hi Daniel,
Yes get(row) is more expensive than get(row, column name). Keep in mind that
HBase is column oriented. So when you fetch data from multiple columns it
means that it will need to access multiple files (1 per column family) in
order to get the data for the whole row.
Sebastien
On Tue
hi all,
i'm writting a program to access my hbase table in a MR job. my first
version is to get different values from get(row,column name),
and now im changing to get one row each time into a map, and query that map
instead - for one reduce job.
i think it would be better to access hbase only
Srikanth,
Interesting, the META table is never scanned at all! I think that happened
to me once we I started messing around with HBase. Since the meta table is
missing, I guess you don't have any data in HBase so I suggest shutting down
HBase, then Hadoop, format HDFS, restart Hadoop and then rest
Thanks JD, I'm using 0.1.3 currently, will upgrade to 0.2 soon.
I tried scanner in 0.1.3, seems not very efficient on performance? Reading all
serialized objects from just one column is much faster than reading from a whole
column family with scanner.
From: "Jean-Daniel Cryans" <[EMAIL PROTECTED]>
Hi,
I am using HBase version 0.1.2 and Hadoop version 0.16.4. These
are the log file contents of the HBase after starting the HBase and
giving a query from the HBase Shell: -
1) HBase master
2008-07-15 09:29:01,298 INFO org.apache.hadoop.hbase.HMaster: Root
region dir: file:/home/srikanth/
