Deprecating HMerge is fine. On Wed, Sep 28, 2016 at 7:32 AM, Lars George <lars.geo...@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 <yuzhih...@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 <st...@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.geo...@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.geo...@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 > >> > > >> > > >> >