I did not quite understand what you mean by "row timestamp"? As far as I
know, timestamp is associated to each data version (cell). Will you store
multiple data versions in a single column?
On Thu, Jun 22, 2017 at 4:35 AM, Jean-Marc Spaggiari <
jean-m...@spaggiari.org> wrote:
> Why not using th
If you want to compare the performances, you need to run way bigger and
> > longer tests. Dont run them in parallete. Run them at least 10 time each
> to
> > make sure you have a good trend. Is the difference between the 2
> > significant? It should not.
> >
> > JM
give you the consistency of being
> within a row.
>
> JM
>
> 2015-01-19 14:28 GMT-05:00 yonghu :
>
> > Dear all,
> >
> > I want to record the user history data. I know there exists two options,
> > one is to store user events in a single row with multiple data
Dear all,
I want to record the user history data. I know there exists two options,
one is to store user events in a single row with multiple data versions and
the other one is to use multiple rows. I wonder which one is better for
performance?
Thanks!
Yong
Hi,
I write a copyTable mapreduce program. My hbase version is 0.94.16. Several
rows in the source table contain multiple data versions. The Map function
looks like follows:
public void map(ImmutableBytesWritable rowKey, Result res, Context context)
throws IOException, InterruptedException{
for(K
Hello all,
I want to implement difference operator by using MapReduce. I read two
tables by using MultiTableInputFormat. In the Map phase, I need to tag the
name of table into each row, but how can I get the table name?
One way I can think is to create HTable instance for each table in the
setup(
Dear All,
Suppose that I have a key range from 1 to 100 and want to store 1-50 in the
first node and 51-100 in the second node. How can I do this in Hbase?
regards!
Yong
Hello,
Can anyone give me a concrete use case for ttl deletions? I mean in which
situation we should set ttl property?
regards!
Yong
I did not quite understand your problem. You store your data in HBase, and
I guess later you also will read data from it. Generally, HBase will first
check if the data exist in memstore, if not, it will check the disk. If you
set the memstore to 0, it denotes every read will directly forward to dis
Hi,
If a author does not have hundreds of publications, you can directly write
in one column. Hence, your column will contain multiple data versions. The
default data version is 3 but you can send more.
On Tue, Jul 22, 2014 at 4:20 AM, Ishan Chhabra
wrote:
> Arun,
> You need to represent your
I think you can define coprocessors to do this. For example, for every put
command, you can keep the desired versions that you want, and later put the
older version into the other table or HDFS. Finally, either let Hbase
delete your stale data or let coprocessor do that for you. The problem of
this
I think the right understanding of this is it will slow down the data query
processing. You can think the RS who hit a heady I/O as a hotspot node. It
will not slow down the whole cluster, it will only slow down the data
applications which access the data from that RS.
On Thu, Apr 3, 2014 at 3:58
Hbase uses LSM tree and SStable, not sure for fractal tree
On Fri, Feb 28, 2014 at 2:57 PM, Shahab Yunus wrote:
> http://www.slideshare.net/jaxlondon2012/hbase-advanced-lars-george
> http://hortonworks.com/hadoop/hbase/
>
> Regards,
> Shahab
>
>
> On Fri, Feb 28, 2014 at 8:36 AM, Vimal Jain wro
Before you want to trigger major compaction, let's first explain why do we
need major compaction. The major compaction will cause
1. delete the data which is masked by tombstone;
2. delete the data which has expired ttl;
3. compact several small hfiles into a single larger one.
I didn't quite unde
I also calculated the years of ttl, just for fun. :). But as Jean said,
default ttl is forever.
On Tue, Feb 18, 2014 at 2:05 PM, Jean-Marc Spaggiari <
jean-m...@spaggiari.org> wrote:
> Hi Mohamed,
>
> Default value is MAX_VALUE, which is considered as "forever". So default
> TTL is NOT 69 years.
Hi,
To process the data in Hbase. You can have different options.
1. Java program using Hbase api;
2. MapReduce program;
3. High-level languages, such as Hive or Pig (built on top of MapReduce);
4. Phoenix also a High-level language (built based on coprocessor).
which one you should use depends
In my opinion, it really depends on your queries.
The first one achieves data locality. There is no additional data transmit
between different nodes. But this strategy sacrifices parallelism and the
node which stores A will be a hot node if too many applications try to
access A.
The second appro
The question is what you mean of "real-time". What is your performance
request? In my opinion, I don't think the MapReduce is suitable for the
real time data processing.
On Fri, Nov 29, 2013 at 9:55 AM, Azuryy Yu wrote:
> you can try phoniex.
> On 2013-11-29 3:44 PM, "Ramon Wang" wrote:
>
> >
s fully understand the case and verify the fix.
> >
> > Thanks
> >
> >
> > On Tue, Oct 22, 2013 at 12:51 PM, Ted Yu wrote:
> >
> >> I logged HBASE-9819 to backport HBASE-8372 'Provide mutability to
> >> CompoundConfiguration' to 0.94
&
e() or hc.getTable().
regards!
Yong
On Tue, Oct 22, 2013 at 8:42 PM, Ted Yu wrote:
> There're two types of exceptions. In the code below, I saw rce.getTable()
> being commented out.
>
> Can you tell us the correlation between types of exception and getTable()
> calls ?
>
nection has to be unmanaged.");
> }
>
> Cheers
>
>
> On Tue, Oct 22, 2013 at 11:14 AM, yonghu wrote:
>
> > Ted,
> >
> > Can you tell me how to dump the stack trace of HBase? By the way, I check
> > the log of RegionServer. It has
tion.java:61)
at
org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost.prePut(RegionCoprocessorHost.java:808)
... 9 more
: 1 time, servers with issues: hans-laptop:60020,
On Tue, Oct 22, 2013 at 8:14 PM, yonghu wrote:
> Ted,
>
> Can you tell me how to dump the stack trace of HBa
roblem ?
>
> Cheers
>
>
> On Tue, Oct 22, 2013 at 11:01 AM, yonghu wrote:
>
> > Gray,
> >
> > Finally, I saw the error messages. ERROR:
> > org.apache.hadoop.hbase.client.RetriesExhaustedWithDetailsException:
> Failed
> > 1 action: o
x27;
threw: 'java.lang.UnsupportedOperationException: Immutable Configuration'
and has been removed from the active coprocessor set.
I will try different approach as Ted mentioned.
On Tue, Oct 22, 2013 at 7:49 PM, yonghu wrote:
> Gray
>
> Thanks for your response. I tried your appro
specially 9.3.1.1.
> >
> >
> > On Tue, Oct 22, 2013 at 9:37 AM, yonghu wrote:
> >
> > > Hello,
> > >
> > > In the oldest verison of HBase , I can get the HTableInterface by
> > > HTablePool.getTable() method. However, in the latest Hbase
Hello,
In the oldest verison of HBase , I can get the HTableInterface by
HTablePool.getTable() method. However, in the latest Hbase version0.94.12,
HTablePool is deprecated. So, I tried to use HConnectionManager to create
HTableInterface, but it does not work. Can anyone tell me how to create
HTab
Hello,
I saw some descriptions that when data modifications (like Put or Delete)
have already been persistent on disk, the log file will be transfered from
/.log folder to /.oldlogs folder. However, I made a simple test. I first
created a table and inserted several data and then I used flush comma
unknown, you can store a special marker in the Cell.
> I used two rows, but as you said, the two Cells can be written using one
> RPC call.
>
> This way, NetworkSupplier column is not needed.
>
> Cheers
>
>
> On Fri, Sep 27, 2013 at 3:04 PM, yonghu wrote:
>
> &g
#x27;d see that supplier c has 15k iff you query the
> latest data, which seems to be what you want.
> Note that you could also query as of TS 4 (c:20k), TS3 (d:20k), TS2 (d:10k)
>
>
> -- Lars
>
>
>
>
> From: yonghu
> To: user@hbase.apa
(1,3,5) are timestamp.
regards!
Yong
On Fri, Sep 27, 2013 at 4:47 PM, Ted Yu wrote:
> In {10K:1, 20K:3, 15K:5}, what does the value (1, 3, 5) represent ?
>
> Cheers
>
>
> On Fri, Sep 27, 2013 at 7:24 AM, yonghu wrote:
>
> > Hello,
> >
> > In my un
Hello,
In my understanding, the timestamp of each data version is generated by Put
command. The value of TS is either indicated by user or assigned by HBase
itself. If the TS is generated by HBase, it only records when (the time
point) that data version is generated (Have no meaning to the applica
Different from the RDBMS, the data in HBase is stored as key-value pair in
HDFS. Hence, for every data version in a cell, the row key will appear.
On Tue, Sep 17, 2013 at 7:53 PM, Ted Yu wrote:
> w.r.t. Data Block Encoding, you can find some performance numbers here:
>
>
> https://issues.apache
I think you can take a look at the
http://hbase.apache.org/book/regions.arch.html, it describes the data
storage hierarchy of HBase. Due to the statement of Lars "stems from the
fact that HBase flushes by region (which means all stores of that region
are flushed)", you can think the limitations of
table (look at TableInputFormat to see how it is
> done). The map tasks will run in parallel.
>
> Jeff
>
>
> On Tue, Aug 20, 2013 at 8:45 AM, yonghu wrote:
>
> > Hello,
> >
> > I know if I use default scan api, HBase scans table in a serial manner,
> as
>
Hello,
I know if I use default scan api, HBase scans table in a serial manner, as
it needs to guarantee the order of the returned tuples. My question is if I
use MapReduce to read the HBase table, and directly output the results in
HDFS, not returned back to client. The HBase scan is still in a se
Use HTablePool instead. For more infor,
http://hbase.apache.org/book/client.html.
On Thu, Aug 1, 2013 at 3:32 PM, yonghu wrote:
> If I want to use multi-thread with thread safe, which class should I use?
>
>
> On Thu, Aug 1, 2013 at 3:08 PM, Ted Yu wrote:
>
>> HTab
If I want to use multi-thread with thread safe, which class should I use?
On Thu, Aug 1, 2013 at 3:08 PM, Ted Yu wrote:
> HTable is not thread safe.
>
> On Aug 1, 2013, at 5:58 AM, Pavel Hančar wrote:
>
> > Hello,
> > I have a class extending BaseRegionObserver and I use the postPut method
> t
The ways that you can lose data in my point of views:
1. some tuples share the same row-key+cf+column. Hence, when you load your
data in HBase, they will be loaded into the same column and may exceed the
predefined max version.
2. As Ted mentioned, you may import some delete, do you generate tomb
You can write one MR job to finish this. First read two tables at Map
function, the output key will be the reference key for one table and
primary key for the other table. At the Reduce function, you can "join" the
tuples which contain the same key. Please note this is a very naive
approach, for m
alancer is supposed to offload one of the daughter regions
> if continuous write load incurs.
>
> Cheers
>
> On Wed, Jul 17, 2013 at 6:53 AM, yonghu wrote:
>
> > Dear all,
> >
> > From the HBase reference book, it mentions that when RegionServer splits
> > regio
Dear all,
>From the HBase reference book, it mentions that when RegionServer splits
regions, it will offline the split region and then adds the daughter
regions to META, opens daughters on the parent's hosting RegionServer and
then reports the split to the Master.
I have a several questions:
1.
Hello,
>From the reference book "5.8.1.4. Put", if I issue a "Put" command without
specifying timestamp, the server will generate a TS for me! I wonder if the
"server" means the master node or regionservers? In my understanding, the
server means the regionserver, as the master will only tells the
he actual execution
> will happen at server side.. (This is what will happen with Endpoints :) )
>
> -Anoop-
>
> On Thu, Jul 4, 2013 at 4:29 PM, yonghu wrote:
>
> > Hi Anoop
> > one more question. Can I use BulkDeleteEndpoint at the client side or
> > should I
> You can have a look at BulkDeleteEndpoint which can do what you want to
>
> -Anoop-
>
> On Thu, Jul 4, 2013 at 4:09 PM, yonghu wrote:
>
> > I check the latest api of Delete class. I am afraid you have to do it by
> > yourself.
> >
> > regards!
> &g
I check the latest api of Delete class. I am afraid you have to do it by
yourself.
regards!
Yong
On Wed, Jul 3, 2013 at 6:46 PM, Rahul Bhattacharjee wrote:
> Hi,
>
> Like scan with range. I would like to delete rows with range.Is this
> supported from hbase shell ?
>
> Lets say I have a table
Hi Lucas,
First, the write request for HBase consists of two parts:
1. Write into WAL;
2. Write into Memstore, when Memstore reaches the threshold, the data in
Memstore will be flushed into disk.
In my understanding, there are two data synchronization points:
The first one is write to WAL. As WA
be tackled.
>
> Cheers
>
> On Wed, Jun 5, 2013 at 7:55 AM, yonghu wrote:
>
> > Can anyone explain why client + rpc + server will decrease the
> performance
> > of scanning? I mean the Regionserver and Tasktracker are the same node
> when
> > you use MapReduc
Can anyone explain why client + rpc + server will decrease the performance
of scanning? I mean the Regionserver and Tasktracker are the same node when
you use MapReduce to scan the HBase table. So, in my understanding, there
will be no rpc cost.
Thanks!
Yong
On Wed, Jun 5, 2013 at 10:09 AM, San
Hello,
I have presented 5 CDC approaches based on HBase and published my results
in adbis 2013.
regards!
Yong
On Mon, Jun 3, 2013 at 11:16 AM, yavuz gokirmak wrote:
> Hi all,
>
> Currently we are working on a hbase change data capture (CDC) tool. I want
> to share our ideas and continue deve
In this situation, you can set the
>
>
> hbase.regionserver.
logroll.period
>
> 360
>
>
to a short value, let's say 3000 and then you can see your log file with
current size after 3 seconds.
To Nicolas,
I guess he wants somehow to analyze the HLog.
regards!
Yong
On Fri, May 1
Dear All,
I wonder how I can set heap size for HBase and what is the suitable
portion compared to whole memory size?
And the other question is that how many memory size I need to give to
Java when I run HBase, as I sometimes got "out of memory" problems.
Thanks!
Yong
Hello,
I think you can use HBase org.apache.hadoop.hbase.client.Delete class.
It already supported to delete a specific version in a cell, see
public Delete deleteColumn(byte[] family, byte[] qualifier, long
timestamp) method.
regards!
Yong
On Thu, Mar 7, 2013 at 9:25 PM, Jonathan Natkins wrot
Hello Dastgiri,
I don't think HBase can support original nested schema which you want
to define. But you can still store your data in HBase. I figured out
several possible solutions:
1. row_key: profileid + profilename + date, the column will be
monthwiseProfileCount:uk and so on. However, this a
run a M/R job that rebuilds the index should
> something occur to the system where you might lose the data. Indexes *ARE*
> expendable. ;-)
>
> Does that explain it?
>
> -Mike
>
> On Feb 18, 2013, at 4:57 AM, yonghu wrote:
>
>> Hi, Michael
>>
>> I don&#x
Hi, Michael
I don't quite understand what do you mean by "round trip back to the
client". In my understanding, as the RegionServer and TaskTracker can
be the same node, MR don't have to pull data into client and then
process. And you also mention the "unnecessary overhead", can you
explain a litt
Forget to say. I also tested MapReduce. It's faster than coprocessor.
On Mon, Feb 18, 2013 at 10:01 AM, yonghu wrote:
> Parkash,
>
> I have a six nodes cluster and met the same problem as you had. In my
> test, inserting one tuple using coprocessor is nearly 10 times slower
Parkash,
I have a six nodes cluster and met the same problem as you had. In my
test, inserting one tuple using coprocessor is nearly 10 times slower
than normal put operation. I think the main reason is what Lars
pointed out, the main overhead is executing RPC.
regards!
Yong
On Mon, Feb 18, 201
Thanks for your response. I will take a look.
yong
On Thu, Feb 7, 2013 at 10:11 PM, Ted Yu wrote:
> Yonghu:
> You may want to take a look at HBASE-5416: Improve performance of scans
> with some kind of filters.
> It would be in the upcoming 0.94.5 release.
>
> You can desi
7, 2013 at 6:29 PM, Ted Yu wrote:
> Can you give us the use case where the scanning order is significant ?
>
> Thanks
>
> On Thu, Feb 7, 2013 at 9:23 AM, yonghu wrote:
>
>> Dear all,
>>
>> I wonder if it is possible to indicate the column scan order when
>&
I think you can treat id as row key. and address-type/home or
address-type/office as column family. each address can be treated as
column. The thing is how you can transform your json metadata into
Hbase schema information.
regards!
Yong
On Mon, Feb 4, 2013 at 11:28 AM, wrote:
> Hi,
>
>
>
version then you have a way to plugin your own
> logcleaner class.
> 'BaseLogCleanerDelegate' is the default thing available. Customise your
> logcleaner as per your requirement so that you can have a back up of the
> logs.
>
> Hope this helps.
>
> Regards
> Ra
the WAL logs. Sorry am not
> getting your question here.
> WAL trigger is for the WAL logs.
>
> Regards
> Ram
>
> On Sat, Feb 2, 2013 at 1:31 PM, yonghu wrote:
>
>> Hello,
>>
>> For some reasons, I need to analyze the log of hbase. However, the log
&
Dear all,
I read the information of
https://github.com/brianfrankcooper/YCSB/wiki/Running-a-Workload
For example, I can indicate the column family name when I issue the
command line as
java -cp build/ycsb.jar:db/hbase/lib/* com.yahoo.ycsb.Client -load -db
com.yahoo.ycsb.db.HBaseClient -P workload
I think you can take a look at your row-key design and evenly
distribute your data in your cluster, as you mentioned even if you
added more nodes, there was no improvement of performance. Maybe you
have a node who is a hot spot, and the other nodes have no work to do.
regards!
Yong
On Tue, Dec 2
>> -Anoop-
>>
>>
>> On Fri, Nov 30, 2012 at 2:04 PM, ramkrishna vasudevan <
>> ramkrishna.s.vasude...@gmail.com> wrote:
>>
>> > Hi
>> >
>> > Pls check if this issue is similar to HBASE-5897. It is fixed in 0.92.2
>> as
>> >
How do you close the major compaction and what hbase version do you use?
On Fri, Nov 30, 2012 at 8:51 AM, Varun Sharma wrote:
> I see nothing like major compaction in the logs of the region server or the
> master...
>
> On Thu, Nov 29, 2012 at 11:46 PM, yonghu wrote:
>
>>
Do you check your log infor? As far as I understood, if there is a
major compaction, this event will be recorded in log.
regards!
Yong
On Fri, Nov 30, 2012 at 8:41 AM, Varun Sharma wrote:
> Hi,
>
> I turned off automatic major compactions and tried to major compact all
> regions via both the re
I like the illustration of Stack.
regards!
Yong
On Wed, Nov 28, 2012 at 6:56 PM, Stack wrote:
> On Wed, Nov 28, 2012 at 6:40 AM, matan wrote:
>
>> Why does the CF have to be in the HFile, isn't the entire HFile dedicated
>> to
>> just one CF to start with (I'm speaking at the HBase architectur
Hi Rams,
yes. You can. See follows:
hbase(main):001:0> create 'test1','course'
0 row(s) in 1.6760 seconds
hbase(main):002:0> put 'test1','tom','course',90
0 row(s) in 0.1040 seconds
hbase(main):003:0> scan 'test1'
ROW COLUMN+CELL
tom column=course:, timestamp
I think you can set setWriteToWAL() method to false to reduce the
amount of log infor. But you may get risks when your cluster is down.
regards!
yong
On Fri, Nov 23, 2012 at 7:58 AM, iwannaplay games
wrote:
> Hi,
>
> Everytime i query hbase or hive ,there is a significant growth in my
> log file
ng a method
> 3) Use a break point while debugging
>
> The answer to your current problem : o.a.h.mapreduce.Reducer method has no
> Iterator parameter but it does have a Iterable parameter...
>
> Regards
>
> Bertrand
>
> PS : It is absolutely not related to HBase.
>
on not online.
> Pls check if your META region is online.
>
> Regards
> ram
>
> On Sat, Nov 10, 2012 at 8:37 PM, yonghu wrote:
>
>> Dear All,
>>
>> I used hbase 0.94.1 and implemented the test example of WAL trigger like:
>>
>> public class Wal
gt;
> -Anoop-
>
> From: Kevin O'dell [kevin.od...@cloudera.com]
> Sent: Monday, October 22, 2012 5:55 PM
> To: user@hbase.apache.org
> Subject: Re: A question of storage structure for memstore?
>
> Yes, there will be two memstores if you have two CFs.
&
at is your usecase for this?
>
> -- Lars
>
>
>
>
> From: yonghu
> To: user@hbase.apache.org
> Sent: Friday, August 31, 2012 1:13 PM
> Subject: Can I use coprocessor to record the deleted data caused by ttl?
>
> Dear All,
>
> I wonder if I can
Sorry for that. I didn't use the right parameter. Now I get the point.
regards!
Yong
On Wed, Aug 22, 2012 at 10:49 AM, Harsh J wrote:
> Hey Yonghu,
>
> You are right that TTL "deletions" (it isn't exactly a delete, its
> more of a compact-time skip wizardry) do
cating LruBlockCache
with maximum size 247.9m
Scanned kv count -> 1
so, I guess the ttl data is only managed in memstore. But the question
is that if memstore doesn't have enough size to accept new incoming
ttl data what will happen? Can anybody explain?
Thanks!
Yong
On Wed, Aug 22, 2012 a
tml
>
>
> ./Zahoor
> HBase Musings
>
>
> On 14-Aug-2012, at 6:54 PM, Harsh J wrote:
>
>> Hi Yonghu,
>>
>> A timestamp is stored along with each insert. The ttl is maintained at
>> the region-store level. Hence, when the log replays, all ent
;>
>> Yes, TTL deletions are done only during compactions. They aren't
>> "Deleted" in the sense of what a Delete insert signifies, but are
>> rather eliminated in the write process when new
>> storefiles are written out - if the value being written to the
&
Hi Harsh,
I have a question of your description. The deleted tag masks the new
inserted value with old timestamp, that's why the new inserted data
can'be seen. But after major compaction, this new value will be seen
again. So, the question is that how the deletion really executes. In
my understand
Hi Hars,
Thanks for your reply. If I understand you right, it means the ttl
deletion will not reflect in log.
On Tue, Aug 14, 2012 at 3:24 PM, Harsh J wrote:
> Hi Yonghu,
>
> A timestamp is stored along with each insert. The ttl is maintained at
> the region-store level. Hence,
My hbase version is 0.92. I tried something as follows:
1.Created a table 'test' with 'course' in which ttl=5.
2. inserted one row into the table. 5 seconds later, the row was deleted.
Later when I checked the log infor of 'test' table, I only found the
inserted information but not deleted informat
Harsh is right. You find the wrong place.
regards!
Yong
On Sun, Aug 12, 2012 at 1:40 PM, Harsh J wrote:
> Richard,
>
> The property disables major compactions from happening automatically.
> However, if you choose to do this, you should ensure you have a cron
> job that does trigger major_compa
In my understanding of column-oriented structure of hbase, the first
thing is the term column-oriented. The meaning is that the data which
belongs to the same column family stores continuously in the disk. For
each column-family, the data is stored as row store. If you want to
understand the intern
:15 PM, yonghu wrote:
>> java.lang.RuntimeException: java.lang.ClassNotFoundException:
>> com.mapreducetablescan.MRTableAccess$MTableReducer;
>>
>> Does anybody know why?
>>
>
> Its not in your job jar? Check the job jar (jar -tf JAR_FILE).
>
> St.Ack
I think you can also use ifconfig command in the VM to see the ip
address. And then you can change your ip address in /etc/hosts.
Regards!
Yong
On Wed, May 2, 2012 at 7:21 PM, Ben Lisbakken wrote:
> Hello --
>
> I've got a problem where the RegionServers try to connect to localhost for
> the Ma
It means that java run time can't find
org/apache/hadoop/hbase/filter/FilterBase class. You have to add the
hbase.jar in your classpath.
regards!
Yong
On Wed, May 2, 2012 at 12:12 PM, cldo wrote:
>
> i want to custom filter hbase.
> i created jar file by eclipse, copy to sever and in file hbase
eans out
> delete markers.
> Delete markers cannot be removed during a minor compaction since an affected
> KeyValue could exist in an HFile that is not part of this compaction.
>
> -- Lars
> ________
>
> From: yonghu
> To: user@hbase.apache.o
Hello,
My HBase version is 0.92.0. And I find that when I use minor
compaction and major compaction to compact a table, there are no
differences. In the minor compaction, it will remove the deleted cells
and discard the exceeding data versions which should be the task of
major compaction. I wonder
As Lars mentioned, the row is not physically deleted. The way which
Hbase uses is to insert a cell called "tombstone" which is used to
mask the deleted value, but value is still there (if the deleted value
is in the same memstore with tombstone, it will be deleted in the
memstore, so you will not f
yes. You can compile the hadoop jar file by yourself and put into the
Hbase lib folder.
Regards!
Yong
On Mon, Apr 16, 2012 at 2:09 PM, Harsh J wrote:
> While I haven't tried this personally, it should be alright to do. You
> need to replace HBase's default hadoop jars (which are 1.0.x/0.20
> v
evice. Please excuse any typos...
>
> Mike Segel
>
> On Apr 16, 2012, at 6:31 AM, yonghu wrote:
>
>> Hello,
>>
>> I wonder if it's possible to install two different Hbase versions in
>> the same cluster?
>>
>> Thanks
>>
>> Yong
>>
byte.eventually it moves the log into .oldlogs also.
>
> Thanks
> Manish
> Sent from my BlackBerry, pls excuse typo
>
> -Original Message-
> From: yonghu
> Date: Sun, 15 Apr 2012 18:58:45
> To:
> Reply-To: user@hbase.apache.org
> Subject: Re: dump HLog cont
Thanks for your reply. After nearly 60minutes, I can see the Hlog volume.
-rw-r--r-- 3 yonghu supergroup 2125 2012-04-15 17:34
/hbase/.logs/yonghu-laptop,60020,1334504008467/yonghu-laptop%2C60020%2C1334504008467.1334504048854
I have no idea why it takes so long time.
Yong
On Sun, Apr
yes
On Sun, Apr 15, 2012 at 6:30 PM, Ted Yu wrote:
> Did 'HLog --dump' show real contents for a 0-sized file ?
>
> Cheers
>
> On Sun, Apr 15, 2012 at 8:58 AM, yonghu wrote:
>
>> Hello,
>>
>> My hbase version is 0.92.0 and is installed in pseud
Hello,
My hbase version is 0.92.0 and is installed in pseudo-mode. I found a
strange situation of HLog. After I inserted new data value into table,
the volume of HLog is 0. I checked in HDFS.
drwxr-xr-x - yonghu supergroup 0 2012-04-15 17:34 /hbase/.logs
drwxr-xr-x - yonghu
blog post by Mingjie may help explain things a bit more:
> https://blogs.apache.org/hbase/entry/coprocessor_introduction
>
>
> --gh
>
>
>
> On Tue, Apr 10, 2012 at 2:30 AM, yonghu wrote:
>> Hello,
>>
>> The description of this method is " /** @return t
Hello,
The description of this method is " /** @return the region associated
with this coprocessor */" and the return value is an HRegion instance.
If I configure the region-coprocessor class in hbase-site.xml. It
means that this coprocessor will be applied to every HRegion which
resides on this
Hi Shwan,
My hbase-version is 0.92.0. I have to mention that in recently I
noticed that the delete semantics between shell and Java api are
different. In shell, if you delete one version, it will mask the
versions whose timestamps are older than that version, it means that
scan will not return the
you should have specified the above option.
>
> On Mon, Mar 19, 2012 at 7:31 AM, yonghu wrote:
>
>> Hello,
>>
>> I used the $ ./bin/hbase org.apache.hadoop.hbase.regionserver.wal.HLog
>> --dump command to check the HLog information. But I can not find any
>> da
Hello,
I used the $ ./bin/hbase org.apache.hadoop.hbase.regionserver.wal.HLog
--dump command to check the HLog information. But I can not find any
data information. The output of my HLog file is looks like follows:
Sequence 933 from region 85986149309dff24ecf7be4873136f15 in table test
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