If we use the class CleanFromMeta in http://www.mail-archive.com/[email protected]/msg06620.html to delete related entries in .META., will the corresponding znode for the table get automatically deleted? Thanks.
Ey-Chih Chow On May 7, 2012, at 8:11 AM, Jiajun Chen wrote: > Yeah ! > delete the znode for that table and restart the cluster then create it > successfully ! > > On 7 May 2012 23:08, Dave Wang <[email protected]> wrote: > >> You may need to edit your ZK nodes. Depending on what version of HBase you >> are running, you may need to either create or delete the znode for that >> table. >> >> - Dave >> >> On Mon, May 7, 2012 at 7:57 AM, Jiajun Chen <[email protected]> wrote: >> >>> I deleted all rows of cjjWaitHash in .META. used deleteall in shell ,and >>> output nothing after echo "scan '.META.'" | hbase shell | grep >> cjjWaitHash >>> . >>> >>> but why ? >>> >>>> count 'cjjWaitHash' >>> ERROR: Unknown table cjjWaitHash! >>> >>>> enable 'cjjWaitHash' >>> ERROR: Table cjjWaitHash does not exist.' >>> >>>> disable 'cjjWaitHash' >>> ERROR: Table cjjWaitHash does not exist.' >>> >>>> create 'cjjWaitHash',{NAME => 'c',COMPRESSION =>'LZO', VERSIONS => '1'} >>> ERROR: Table already exists: cjjWaitHash! >>> >>> >>> On 7 May 2012 22:34, Jiajun Chen <[email protected]> wrote: >>> >>>> But I can't find the key contains cjjWaitHash use the following code: >>>> >>>> public void printMETA() throws IOException >>>> { >>>> final HTable table = MyHBaseConfiguration.getTable(".META."); >>>> final Scan scan = new Scan(); >>>> final ResultScanner scanner = table.getScanner(scan); >>>> >>>> while (true) >>>> { >>>> final Result next = scanner.next(); >>>> if (null == next) >>>> { >>>> >>>> return; >>>> } >>>> final String row = Bytes.toString(next.getRow()); >>>> if (row.contains("cjjWaitHash")) >>>> { >>>> System.err.println(row); >>>> } >>>> System.out.println(row); >>>> >>>> } >>>> } >>>> >>>> On 7 May 2012 22:30, Doug Meil <[email protected]> wrote: >>>> >>>>> >>>>> This is why Harsh was suggesting that you look at what is in META for >>> that >>>>> table. Those records have to get cleaned out of META because HBase >>> thinks >>>>> that table still exists. >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> On 5/7/12 10:23 AM, "Jiajun Chen" <[email protected]> wrote: >>>>> >>>>>> I can lost the data , how to create the table with no data ? >>>>>> >>>>>> On 7 May 2012 22:19, Doug Meil <[email protected]> >> wrote: >>>>>> >>>>>>> >>>>>>> Because you did this... "hadoop fs -rmr /hbase/cjjWaitHash" >>>>>>> >>>>>>> ... your data is gone. >>>>>>> >>>>>>> Per... >>>>>>> >>>>>>> http://hbase.apache.org/book.html#trouble.namenode >>>>>>> >>>>>>> >>>>>>> ... that's where StoreFiles are kept for that particular table. >>>>>>> >>>>>>> >>>>>>> On 5/7/12 10:05 AM, "Jiajun Chen" <[email protected]> wrote: >>>>>>> >>>>>>>> which temp directory ? >>>>>>>> lose the data of all tables ? >>>>>>>> >>>>>>>> On 7 May 2012 22:01, Tom Brown <[email protected]> wrote: >>>>>>>> >>>>>>>>> I made a very similar mistake myself the other day when trying >> to >>>>>>> reset >>>>>>>>> my >>>>>>>>> cluster. What finally solved it was deleting the temp directory >>>>> used >>>>>>>>> by my >>>>>>>>> data nodes (in my case I wanted to loose all my data, so it was >> ok >>>>> to >>>>>>>>> delete everything... In your case, you may have to figure out >> how >>> to >>>>>>>>> export >>>>>>>>> some data first, as I don't know exactly what effect deleting >> that >>>>>>> temp >>>>>>>>> directory will have) >>>>>>>>> >>>>>>>>> Good luck! >>>>>>>>> >>>>>>>>> --Tom >>>>>>>>> >>>>>>>>> On Monday, May 7, 2012, Doug Meil wrote: >>>>>>>>> >>>>>>>>>> >>>>>>>>>> Harsh pretty much summed it up already (e.g., "don't do that") >>> but >>>>>>>>> below >>>>>>>>>> is some further reading of what just happened... >>>>>>>>>> >>>>>>>>>> http://hbase.apache.org/book.html#arch.catalog >>>>>>>>>> http://hbase.apache.org/book.html#trouble.namenode >>>>>>>>>> >>>>>>>>>> ... META is just an HBase table under the covers. By deleting >>> the >>>>>>>>> table >>>>>>>>> on >>>>>>>>>> the HDFS filesystem, it did nothing with the table metadata in >>>>>>> META. >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> On 5/7/12 9:18 AM, "Harsh J" <[email protected] >> <javascript:;>> >>>>>>>>> wrote: >>>>>>>>>> >>>>>>>>>>> The drop is what you ought to have done first, before >> removing >>>>>>> the FS >>>>>>>>>>> folder and the meta entries. It does all those actions for >> you. >>>>>>> Why >>>>>>>>>>> did you do it this way? >>>>>>>>>>> >>>>>>>>>>> Do you see the table still appearing in the list outputs? Can >>> you >>>>>>>>>>> provide us a paste bin link of: >>>>>>>>>>> >>>>>>>>>>> echo "scan '.META.'" | hbase shell | grep cjjWaitHash >>>>>>>>>>> >>>>>>>>>>> On Mon, May 7, 2012 at 6:44 PM, Jiajun Chen < >>>>> [email protected] >>>>>>>>> <javascript:;>> >>>>>>>>>> wrote: >>>>>>>>>>>> I deleted the folder use bin/hadoop fs -rmr >>> /hbase/cjjWaitHash >>>>>>> ,and >>>>>>>>>>>> deleted >>>>>>>>>>>> the row with prefix cjjWaitHash in .META. >>>>>>>>>>>> Now how can I drop the table cjjWaitHash ? >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> -- >>>>>>>>>>> Harsh J >>>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> -- >>>>>>>> >>>>>>> >>>>>>> >>>>>> -- >>>>> >>>>> >>>>> >>>> >>> >> > > > > -- > > 陈加俊 项目经理 > 优讯时代（北京）网络技术有限公司 > 优讯网 www.uuwatch.com > > 地址：北京市海淀区上地五街7号昊海大厦207 > > 电话：010-82895510 > 传真：010-82896636 > 手机：15110038983 > 电邮：*[email protected]*
