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 <[email protected]> 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 <[email protected]> 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 > >
