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From Lars George <lars.geo...@gmail.com>
Subject Re: Merge and HMerge
Date Wed, 28 Sep 2016 14:32:37 GMT
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-20,1309613053987.23a35ac696bdf4a8023dcc4c5b8419e0.'
>> 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.e7c16267eb30e147e5d988c63d40f982. \
>> >>> testtable,row-30,1309614509041.a9cde1cbc7d1a21b1aca2ac7fda30ad8.
>> >>>
>> >>> But I get consistently errors:
>> >>>
>> >>> 11/07/02 07:20:49 INFO util.Merge: Merging regions
>> >>> testtable,row-20,1309613053987.23a35ac696bdf4a8023dcc4c5b8419e0. 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-20,1309613053987.23a35ac696bdf4a8023dcc4c5b8419e0.
>> >>>       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
>> >
>> >
>>

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