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From Apekshit Sharma <a...@cloudera.com>
Subject Re: Merge and HMerge
Date Wed, 18 Jan 2017 22:28:22 GMT
+1, although kind of late since it's already done.
But great to see this 5+ years old issue finally resolved.

On Mon, Jan 16, 2017 at 9:24 PM, Stack <stack@duboce.net> wrote:

> On Sat, Jan 14, 2017 at 9:50 PM, Lars George <lars.george@gmail.com>
> wrote:
>
> > I think that makes sense. The tool with its custom code dates back to
> > where we had no built in version. I am all for removing all of the tools
> > and leave the API call only. That is the same for an admin then compared
> to
> > calling flush or split.
> >
> > No?
> >
> >
> Sounds good to me.
> St.Ack
>
>
>
> > Lars
> >
> > Sent from my iPhone
> >
> > On 15 Jan 2017, at 04:25, Stephen Jiang <syuanjiangdev@gmail.com> wrote:
> >
> > >> If you remove the util.Merge tool, how then does an operator ask for a
> > merge
> > > in its absence?
> > >
> > > We have a shell command to merge region.  In the past, it calls the
> same
> > RS
> > > side code.  I don't think there is a need to have util.Merge (even if
> we
> > > really want, we can ask this utility to call HBaseAdmin.mergeRegions,
> > which
> > > is the same path from the merge command through 'hbase shell').
> > >
> > > Thanks
> > > Stephen
> > >
> > >> On Fri, Jan 13, 2017 at 11:29 PM, Stack <stack@duboce.net> wrote:
> > >>
> > >> On Fri, Jan 13, 2017 at 7:16 PM, Stephen Jiang <
> syuanjiangdev@gmail.com
> > >
> > >> wrote:
> > >>
> > >>> Revive this thread
> > >>>
> > >>> I am in the process of removing Region Server side merge (and split)
> > >>> transaction code in master branch; as now we have merge (and split)
> > >>> procedure(s) from master doing the same thing.
> > >>>
> > >>>
> > >> Good (Issue?)
> > >>
> > >>
> > >>> The Merge tool depends on RS-side merge code.  I'd like to use this
> > >> chance
> > >>> to remove the util.Merge tool.  This is for 2.0 and up releases only.
> > >>> Deprecation does not work here; as keeping the RS-side merge code
> would
> > >>> have duplicate logic in source code and make the new Assignment
> manager
> > >>> code more complicated.
> > >>>
> > >>>
> > >> Could util.Merge be changed to ask the Master run the merge (via
> AMv2)?
> > >>
> > >> If you remove the util.Merge tool, how then does an operator ask for a
> > >> merge in its absence?
> > >>
> > >> Thanks Stephen
> > >>
> > >> S
> > >>
> > >>
> > >>> Please let me know whether you have objection.
> > >>>
> > >>> Thanks
> > >>> Stephen
> > >>>
> > >>> PS.  I could deprecated HMerge code if anyone is really using it. 
It
> > has
> > >>> its own logic and standalone (supposed to dangerously work offline
> and
> > >>> merge more than 2 regions - the util.Merge and shell not support
> these
> > >>> functionality for now).
> > >>>
> > >>> On Wed, Nov 16, 2016 at 11:04 AM, Enis Söztutar <enis.soz@gmail.com>
> > >>> wrote:
> > >>>
> > >>>> @Appy what is not clear from above?
> > >>>>
> > >>>> I think we should get rid of both Merge and HMerge.
> > >>>>
> > >>>> We should not have any tool which will work in offline mode by
going
> > >> over
> > >>>> the HDFS data. Seems very brittle to be broken when things get
> > changed.
> > >>>> Only use case I can think of is that somehow you end up with a
lot
> of
> > >>>> regions and you cannot bring the cluster back up because of OOMs,
> etc
> > >> and
> > >>>> you have to reduce the number of regions in offline mode. However,
> we
> > >> did
> > >>>> not see this kind of thing in any of our customers for the last
> couple
> > >> of
> > >>>> years so far.
> > >>>>
> > >>>> I think we should seriously look into improving normalizer and
> > enabling
> > >>>> that by default for all the tables. Ideally, normalizer should
be
> > >> running
> > >>>> much more frequently, and should be configured with higher-level
> goals
> > >>> and
> > >>>> heuristics. Like on average how many regions per node, etc and
> should
> > >> be
> > >>>> looking at the global state (like the balancer) to decide on split
/
> > >>> merge
> > >>>> points.
> > >>>>
> > >>>> Enis
> > >>>>
> > >>>> On Wed, Nov 16, 2016 at 1:17 AM, Apekshit Sharma <appy@cloudera.com
> >
> > >>>> wrote:
> > >>>>
> > >>>>> bq. HMerge can merge multiple regions by going over the list
of
> > >>>>> regions and checking
> > >>>>> their sizes.
> > >>>>> bq. But both of these tools (Merge and HMerge) are very dangerous
> > >>>>>
> > >>>>> I came across HMerge and it looks like dead code. Isn't referenced
> > >> from
> > >>>>> anywhere except one test. (This is what lars also pointed out
in
> the
> > >>>> first
> > >>>>> email too).
> > >>>>> It would make perfect sense if it was a tool or was being
> referenced
> > >>> from
> > >>>>> somewhere, but with lack of either of that, am a bit confused
here.
> > >>>>> @Enis, you seem to know everything about them, please educate
me.
> > >>>>> Thanks
> > >>>>> - Appy
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>> On Thu, Sep 29, 2016 at 12:43 AM, Enis Söztutar <
> enis.soz@gmail.com>
> > >>>>> wrote:
> > >>>>>
> > >>>>>> Merge has very limited usability singe it can do a single
merge
> and
> > >>> can
> > >>>>>> only run when HBase is offline.
> > >>>>>> HMerge can merge multiple regions by going over the list
of
> regions
> > >>> and
> > >>>>>> checking their sizes.
> > >>>>>> And of course we have the "supported" online merge which
is the
> > >> shell
> > >>>>>> command.
> > >>>>>>
> > >>>>>> But both of these tools (Merge and HMerge) are very dangerous
I
> > >>> think.
> > >>>> I
> > >>>>>> would say we should deprecate both to be replaced by the
online
> > >>> merger
> > >>>>>> tool. We should not allow offline merge at all. I fail
to see the
> > >>>> usecase
> > >>>>>> that you have to use an offline merge.
> > >>>>>>
> > >>>>>> Enis
> > >>>>>>
> > >>>>>> On Wed, Sep 28, 2016 at 7:32 AM, Lars George <
> > >> lars.george@gmail.com>
> > >>>>>> wrote:
> > >>>>>>
> > >>>>>>> Hey,
> > >>>>>>>
> > >>>>>>> Sorry to resurrect this old thread, but working on
the book
> > >>> update, I
> > >>>>>>> came across the same today, i.e. we have Merge and
HMerge. I
> > >> tried
> > >>>> and
> > >>>>>>> Merge works fine now. It is also the only one of the
two flagged
> > >> as
> > >>>>>>> being a tool. Should HMerge be removed? At least deprecated?
> > >>>>>>>
> > >>>>>>> Cheers,
> > >>>>>>> Lars
> > >>>>>>>
> > >>>>>>>
> > >>>>>>> On Thu, Jul 7, 2011 at 2:03 AM, Ted Yu <yuzhihong@gmail.com>
> > >>> wrote:
> > >>>>>>>>>> there is already an issue to do this but
not revamp of these
> > >>>> Merge
> > >>>>>>>> classes
> > >>>>>>>> I guess the issue is HBASE-1621
> > >>>>>>>>
> > >>>>>>>> On Wed, Jul 6, 2011 at 2:28 PM, Stack <stack@duboce.net>
> > >> wrote:
> > >>>>>>>>
> > >>>>>>>>> Yeah, can you file an issue Lars.  This stuff
is ancient and
> > >>> needs
> > >>>>> to
> > >>>>>>>>> be redone AND redone so we can do merging while
table is
> > >> online
> > >>>>> (there
> > >>>>>>>>> is already an issue to do this but not revamp
of these Merge
> > >>>>> classes).
> > >>>>>>>>> The unit tests for Merge are also all junit3
and do whacky
> > >>> stuff
> > >>>> to
> > >>>>>>>>> put up multiple regions.  This should be redone
too (they are
> > >>>> often
> > >>>>>>>>> first thing broke when major change and putting
them back
> > >>> together
> > >>>>> is
> > >>>>>>>>> a headache since they do not follow the usual
pattern).
> > >>>>>>>>>
> > >>>>>>>>> St.Ack
> > >>>>>>>>>
> > >>>>>>>>> On Sun, Jul 3, 2011 at 12:38 AM, Lars George
<
> > >>>> lars.george@gmail.com
> > >>>>>>
> > >>>>>>>>> wrote:
> > >>>>>>>>>> Hi Ted,
> > >>>>>>>>>>
> > >>>>>>>>>> The log is from an earlier attempt, I tried
this a few
> > >> times.
> > >>>> This
> > >>>>>> is
> > >>>>>>> all
> > >>>>>>>>> local, after rm'ing the /hbase. So the files
are all pretty
> > >>> empty,
> > >>>>> but
> > >>>>>>> since
> > >>>>>>>>> I put data in I was assuming it should work.
Once you gotten
> > >>> into
> > >>>>> this
> > >>>>>>>>> state, you also get funny error messages in
the shell:
> > >>>>>>>>>>
> > >>>>>>>>>> hbase(main):001:0> list
> > >>>>>>>>>> TABLE
> > >>>>>>>>>> 11/07/03 09:36:21 INFO ipc.HBaseRPC: Using
> > >>>>>>>>> org.apache.hadoop.hbase.ipc.WritableRpcEngine
for
> > >>>>>>>>> org.apache.hadoop.hbase.ipc.HMasterInterface
> > >>>>>>>>>>
> > >>>>>>>>>> ERROR: undefined method `map' for nil:NilClass
> > >>>>>>>>>>
> > >>>>>>>>>> Here is some help for this command:
> > >>>>>>>>>> List all tables in hbase. Optional regular
expression
> > >>> parameter
> > >>>>>> could
> > >>>>>>>>>> be used to filter the output. Examples:
> > >>>>>>>>>>
> > >>>>>>>>>> hbase> list
> > >>>>>>>>>> hbase> list 'abc.*'
> > >>>>>>>>>>
> > >>>>>>>>>>
> > >>>>>>>>>> hbase(main):002:0>
> > >>>>>>>>>>
> > >>>>>>>>>> I am assuming this is collateral, but why?
The UI works but
> > >>> the
> > >>>>>> table
> > >>>>>>> is
> > >>>>>>>>> gone too.
> > >>>>>>>>>>
> > >>>>>>>>>> Lars
> > >>>>>>>>>>
> > >>>>>>>>>>> On Jul 2, 2011, at 10:55 PM, Ted Yu
wrote:
> > >>>>>>>>>>>
> > >>>>>>>>>>> There is TestMergeTool which tests
Merge.
> > >>>>>>>>>>>
> > >>>>>>>>>>> From the log you provided, I got a
little confused as why
> > >>>>>>>>>>> 'testtable,row-20,1309613053987.
> > >>> 23a35ac696bdf4a8023dcc4c5b8419
> > >>>>> e0.'
> > >>>>>>>>> didn't
> > >>>>>>>>>>> appear in your command line or the
output from .META.
> > >>> scanning.
> > >>>>>>>>>>>
> > >>>>>>>>>>> On Sat, Jul 2, 2011 at 10:36 AM, Lars
George <
> > >>>>>> lars.george@gmail.com>
> > >>>>>>>>> wrote:
> > >>>>>>>>>>>
> > >>>>>>>>>>>> Hi,
> > >>>>>>>>>>>>
> > >>>>>>>>>>>> These two seem both in a bit of
a weird state: HMerge is
> > >>>> scoped
> > >>>>>>> package
> > >>>>>>>>>>>> local, therefore no one but the
package can call the
> > >> merge()
> > >>>>>>>>> functions...
> > >>>>>>>>>>>> and no one does that but the unit
test. But it would be
> > >> good
> > >>>> to
> > >>>>>> have
> > >>>>>>>>> this on
> > >>>>>>>>>>>> the CLI and shell as a command
(and in the shell maybe
> > >> with
> > >>> a
> > >>>>>>>>> confirmation
> > >>>>>>>>>>>> message?), but it is not available
AFAIK.
> > >>>>>>>>>>>>
> > >>>>>>>>>>>> HMerge can merge regions of tables
that are disabled. It
> > >>> also
> > >>>>>> merges
> > >>>>>>>>> all
> > >>>>>>>>>>>> that qualify, i.e. where the merged
region is less than or
> > >>>> equal
> > >>>>>> of
> > >>>>>>>>> half the
> > >>>>>>>>>>>> configured max file size.
> > >>>>>>>>>>>>
> > >>>>>>>>>>>> Merge on the other hand does have
a main(), so can be
> > >>> invoked:
> > >>>>>>>>>>>>
> > >>>>>>>>>>>> $ hbase org.apache.hadoop.hbase.util.Merge
> > >>>>>>>>>>>> Usage: bin/hbase merge <table-name>
<region-1> <region-2>
> > >>>>>>>>>>>>
> > >>>>>>>>>>>> Note how the help insinuates that
you can use it as a
> > >> tool,
> > >>>> but
> > >>>>>>> that is
> > >>>>>>>>> not
> > >>>>>>>>>>>> correct. Also, it only merges two
given regions, and the
> > >>>> cluster
> > >>>>>>> must
> > >>>>>>>>> be
> > >>>>>>>>>>>> shut down (only the HBase daemons).
So that is a step
> > >> back.
> > >>>>>>>>>>>>
> > >>>>>>>>>>>> What is worse is that I cannot
get it to work. I tried in
> > >>> the
> > >>>>>> shell:
> > >>>>>>>>>>>>
> > >>>>>>>>>>>> hbase(main):001:0> create 'testtable',
'colfam1',  {SPLITS
> > >>> =>
> > >>>>>>>>>>>> ['row-10','row-20','row-30','row-40','row-50']}
> > >>>>>>>>>>>> 0 row(s) in 0.2640 seconds
> > >>>>>>>>>>>>
> > >>>>>>>>>>>> hbase(main):002:0> for i in
'0'..'9' do for j in '0'..'9'
> > >> do
> > >>>> put
> > >>>>>>>>>>>> 'testtable', "row-#{i}#{j}", "colfam1:#{j}",
"#{j}" end
> > >> end
> > >>>>>>>>>>>> 0 row(s) in 1.0450 seconds
> > >>>>>>>>>>>>
> > >>>>>>>>>>>> hbase(main):003:0> flush 'testtable'
> > >>>>>>>>>>>> 0 row(s) in 0.2000 seconds
> > >>>>>>>>>>>>
> > >>>>>>>>>>>> hbase(main):004:0> scan '.META.',
{ COLUMNS =>
> > >>>>>> ['info:regioninfo']}
> > >>>>>>>>>>>> ROW                           
      COLUMN+CELL
> > >>>>>>>>>>>> testtable,,1309614509037.612d1e0112
> > >> column=info:regioninfo,
> > >>>>>>>>>>>> timestamp=130...
> > >>>>>>>>>>>> 406e6c2bb482eeaec57322.       
     STARTKEY => '', ENDKEY
> > >>> =>
> > >>>>>>> 'row-10'
> > >>>>>>>>>>>> testtable,row-10,1309614509040.2fba
> > >> column=info:regioninfo,
> > >>>>>>>>>>>> timestamp=130...
> > >>>>>>>>>>>> fcc9bc6afac94c465ce5dcabc5d1. 
     STARTKEY => 'row-10',
> > >>>> ENDKEY
> > >>>>>> =>
> > >>>>>>>>>>>> 'row-20'
> > >>>>>>>>>>>> testtable,row-20,1309614509041.e7c1
> > >> column=info:regioninfo,
> > >>>>>>>>>>>> timestamp=130...
> > >>>>>>>>>>>> 6267eb30e147e5d988c63d40f982. 
     STARTKEY => 'row-20',
> > >>>> ENDKEY
> > >>>>>> =>
> > >>>>>>>>>>>> 'row-30'
> > >>>>>>>>>>>> testtable,row-30,1309614509041.a9cd
> > >> column=info:regioninfo,
> > >>>>>>>>>>>> timestamp=130...
> > >>>>>>>>>>>> e1cbc7d1a21b1aca2ac7fda30ad8. 
     STARTKEY => 'row-30',
> > >>>> ENDKEY
> > >>>>>> =>
> > >>>>>>>>>>>> 'row-40'
> > >>>>>>>>>>>> testtable,row-40,1309614509041.d458
> > >> column=info:regioninfo,
> > >>>>>>>>>>>> timestamp=130...
> > >>>>>>>>>>>> 236feae097efcf33477e7acc51d4. 
     STARTKEY => 'row-40',
> > >>>> ENDKEY
> > >>>>>> =>
> > >>>>>>>>>>>> 'row-50'
> > >>>>>>>>>>>> testtable,row-50,1309614509041.74a5
> > >> column=info:regioninfo,
> > >>>>>>>>>>>> timestamp=130...
> > >>>>>>>>>>>> 7dc7e3e9602d9229b15d4c0357d1. 
     STARTKEY => 'row-50',
> > >>>> ENDKEY
> > >>>>>> =>
> > >>>>>>> ''
> > >>>>>>>>>>>> 6 row(s) in 0.0440 seconds
> > >>>>>>>>>>>>
> > >>>>>>>>>>>> hbase(main):005:0> exit
> > >>>>>>>>>>>>
> > >>>>>>>>>>>> $ ./bin/stop-hbase.sh
> > >>>>>>>>>>>>
> > >>>>>>>>>>>> $ hbase org.apache.hadoop.hbase.util.Merge
testtable \
> > >>>>>>>>>>>> testtable,row-20,1309614509041.
> > >>> e7c16267eb30e147e5d988c63d40f9
> > >>>>> 82.
> > >>>>>> \
> > >>>>>>>>>>>> testtable,row-30,1309614509041.
> > >>> a9cde1cbc7d1a21b1aca2ac7fda30a
> > >>>>> d8.
> > >>>>>>>>>>>>
> > >>>>>>>>>>>> But I get consistently errors:
> > >>>>>>>>>>>>
> > >>>>>>>>>>>> 11/07/02 07:20:49 INFO util.Merge:
Merging regions
> > >>>>>>>>>>>> testtable,row-20,1309613053987.
> > >>> 23a35ac696bdf4a8023dcc4c5b8419
> > >>>>> e0.
> > >>>>>>> and
> > >>>>>>>>>>>> testtable,row-30,1309613053987.
> > >> 3664920956c30ac5ff2a7726e4e6
> > >>>> in
> > >>>>>>> table
> > >>>>>>>>>>>> testtable
> > >>>>>>>>>>>> 11/07/02 07:20:49 INFO wal.HLog:
HLog configuration:
> > >>>>> blocksize=32
> > >>>>>>> MB,
> > >>>>>>>>>>>> rollsize=30.4 MB, enabled=true,
optionallogflushinternal=
> > >>>> 1000ms
> > >>>>>>>>>>>> 11/07/02 07:20:49 INFO wal.HLog:
New hlog
> > >>>>>>>>>>>>
> > >>>>>>>>> /Volumes/Macintosh-HD/Users/larsgeorge/.logs_
> > >>> 1309616449171/hlog.
> > >>>>>>> 1309616449181
> > >>>>>>>>>>>> 11/07/02 07:20:49 INFO wal.HLog:
> > >>> getNumCurrentReplicas--HDFS-
> > >>>>> 826
> > >>>>>>> not
> > >>>>>>>>>>>> available; hdfs_out=org.apache.hadoop.fs.
> > >>>>>>> FSDataOutputStream@25961581,
> > >>>>>>>>>>>>
> > >>>>>>>>> exception=org.apache.hadoop.fs.ChecksumFileSystem$
> > >>>>>>> ChecksumFSOutputSummer.getNumCurrentReplicas()
> > >>>>>>>>>>>> 11/07/02 07:20:49 INFO regionserver.HRegion:
Setting up
> > >>>>>>> tabledescriptor
> > >>>>>>>>>>>> config now ...
> > >>>>>>>>>>>> 11/07/02 07:20:49 INFO regionserver.HRegion:
Onlined
> > >>>>>>>>> -ROOT-,,0.70236052;
> > >>>>>>>>>>>> next sequenceid=1
> > >>>>>>>>>>>> info: null
> > >>>>>>>>>>>> region1: [B@48fd918a
> > >>>>>>>>>>>> region2: [B@7f5e2075
> > >>>>>>>>>>>> 11/07/02 07:20:49 FATAL util.Merge:
Merge failed
> > >>>>>>>>>>>> java.io.IOException: Could not
find meta region for
> > >>>>>>>>>>>> testtable,row-20,1309613053987.
> > >>> 23a35ac696bdf4a8023dcc4c5b8419
> > >>>>> e0.
> > >>>>>>>>>>>>      at
> > >>>>>>>>>>>> org.apache.hadoop.hbase.util.Merge.mergeTwoRegions(Merge.
> > >>>>>> java:211)
> > >>>>>>>>>>>>      at org.apache.hadoop.hbase.util.
> > >>>> Merge.run(Merge.java:111)
> > >>>>>>>>>>>>      at org.apache.hadoop.util.
> > >> ToolRunner.run(ToolRunner.
> > >>>>>> java:65)
> > >>>>>>>>>>>>      at org.apache.hadoop.hbase.util.
> > >>>>> Merge.main(Merge.java:386)
> > >>>>>>>>>>>> 11/07/02 07:20:49 INFO regionserver.HRegion:
Setting up
> > >>>>>>> tabledescriptor
> > >>>>>>>>>>>> config now ...
> > >>>>>>>>>>>> 11/07/02 07:20:49 INFO regionserver.HRegion:
Onlined
> > >>>>>>>>> .META.,,1.1028785192;
> > >>>>>>>>>>>> next sequenceid=1
> > >>>>>>>>>>>> 11/07/02 07:20:49 INFO regionserver.HRegion:
Closed
> > >>>>>>> -ROOT-,,0.70236052
> > >>>>>>>>>>>> 11/07/02 07:20:49 INFO wal.HLog:
main.logSyncer exiting
> > >>>>>>>>>>>> 11/07/02 07:20:49 ERROR util.Merge:
exiting due to error
> > >>>>>>>>>>>> java.lang.NullPointerException
> > >>>>>>>>>>>>      at
> > >>>>>>>>> org.apache.hadoop.hbase.util.Merge$1.processRow(Merge.java:
> > >> 119)
> > >>>>>>>>>>>>      at
> > >>>>>>>>>>>>
> > >>>>>>>>> org.apache.hadoop.hbase.util.MetaUtils.scanMetaRegion(
> > >>>>>>> MetaUtils.java:229)
> > >>>>>>>>>>>>      at
> > >>>>>>>>>>>>
> > >>>>>>>>> org.apache.hadoop.hbase.util.MetaUtils.scanMetaRegion(
> > >>>>>>> MetaUtils.java:258)
> > >>>>>>>>>>>>      at org.apache.hadoop.hbase.util.
> > >>>> Merge.run(Merge.java:116)
> > >>>>>>>>>>>>      at org.apache.hadoop.util.
> > >> ToolRunner.run(ToolRunner.
> > >>>>>> java:65)
> > >>>>>>>>>>>>      at org.apache.hadoop.hbase.util.
> > >>>>> Merge.main(Merge.java:386)
> > >>>>>>>>>>>>
> > >>>>>>>>>>>> After which I most of the times
have shot .META. with an
> > >>> error
> > >>>>>>>>>>>>
> > >>>>>>>>>>>> 2011-07-02 06:42:10,763 WARN org.apache.hadoop.hbase.
> > >>>>>>> master.HMaster:
> > >>>>>>>>> Failed
> > >>>>>>>>>>>> getting all descriptors
> > >>>>>>>>>>>> java.io.FileNotFoundException:
No status for
> > >>>>>>>>>>>> hdfs://localhost:8020/hbase/.corrupt
> > >>>>>>>>>>>>      at
> > >>>>>>>>>>>>
> > >>>>>>>>> org.apache.hadoop.hbase.util.FSUtils.getTableInfoModtime(
> > >>>>>>> FSUtils.java:888)
> > >>>>>>>>>>>>      at
> > >>>>>>>>>>>>
> > >>>>>>>>> org.apache.hadoop.hbase.util.FSTableDescriptors.get(
> > >>>>>>> FSTableDescriptors.java:122)
> > >>>>>>>>>>>>      at
> > >>>>>>>>>>>>
> > >>>>>>>>> org.apache.hadoop.hbase.util.FSTableDescriptors.getAll(
> > >>>>>>> FSTableDescriptors.java:149)
> > >>>>>>>>>>>>      at
> > >>>>>>>>>>>>
> > >>>>>>>>> org.apache.hadoop.hbase.master.HMaster.
> > >>>>> getHTableDescriptors(HMaster.
> > >>>>>>> java:1429)
> > >>>>>>>>>>>>      at sun.reflect.NativeMethodAccessorImpl.
> > >>> invoke0(Native
> > >>>>>>> Method)
> > >>>>>>>>>>>>      at
> > >>>>>>>>>>>>
> > >>>>>>>>> sun.reflect.NativeMethodAccessorImpl.invoke(
> > >>>>>>> NativeMethodAccessorImpl.java:39)
> > >>>>>>>>>>>>      at
> > >>>>>>>>>>>>
> > >>>>>>>>> sun.reflect.DelegatingMethodAccessorImpl.invoke(
> > >>>>>>> DelegatingMethodAccessorImpl.java:25)
> > >>>>>>>>>>>>      at java.lang.reflect.Method.invoke(Method.java:597)
> > >>>>>>>>>>>>      at
> > >>>>>>>>>>>>
> > >>>>>>>>> org.apache.hadoop.hbase.ipc.WritableRpcEngine$Server.call(
> > >>>>>>> WritableRpcEngine.java:312)
> > >>>>>>>>>>>>      at
> > >>>>>>>>>>>>
> > >>>>>>>>> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(
> > >>>>>>> HBaseServer.java:1065)
> > >>>>>>>>>>>>
> > >>>>>>>>>>>> Lars
> > >>>>>>>>>>
> > >>>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>
> > >>>>>>
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>> --
> > >>>>>
> > >>>>> -- Appy
> > >>>>>
> > >>>>
> > >>>
> > >>
> >
>



-- 

-- Appy

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