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From J Mohamed Zahoor <jmo...@gmail.com>
Subject Re: Hbase- Hadoop DFS size not decreased even after deleting a column family
Date Fri, 10 Aug 2012 07:24:47 GMT
Look at this post for more about Catalog Janitor

http://blog.zahoor.in/2012/08/hbase-hmaster-architecture/

./zahoor

On Fri, Aug 10, 2012 at 12:47 PM, J Mohamed Zahoor <jmozah@gmail.com> wrote:

> Hi Lars,
>
> Will file it...
>
> ./Zahoor
>
>
> On Fri, Aug 10, 2012 at 12:00 AM, lars hofhansl <lhofhansl@yahoo.com>wrote:
>
>> Hi zahoor,
>>
>> could you file a jira with what you found? It looks like a bug.
>> Thanks.
>>
>>
>> -- Lars
>>
>>
>>
>> ----- Original Message -----
>> From: J Mohamed Zahoor <jmozah@gmail.com>
>> To: user@hbase.apache.org
>> Cc:
>> Sent: Thursday, August 9, 2012 2:03 AM
>> Subject: Re: Hbase- Hadoop DFS size not decreased even after deleting a
>> column family
>>
>> Hi
>>
>> I see this atleast in trunk... in TableDeleteFamilyHandler's constructor..
>>
>> public TableDeleteFamilyHandler(byte[] tableName, byte [] familyName,
>>
>>       Server server, final MasterServices masterServices)
>> throwsIOException {
>>
>>     super(EventType.C_M_ADD_FAMILY, tableName, server, masterServices);
>>
>>     HTableDescriptor htd = getTableDescriptor();
>>
>>     this.familyName = hasColumnFamily(htd, familyName);
>>
>>   }
>>
>>
>> The event type is added as C_M_ADD_FAMILY....
>> May be this is the problem and it is there in 0.94.1 also !!!
>>
>> ./zahoor
>>
>>
>> On Wed, Aug 8, 2012 at 5:33 PM, prem yadav <ipremyadav@gmail.com> wrote:
>>
>> > Hi Stack,
>> > we have got a lot of these in the logs after we deleted the column
>> family.
>> >
>> > org.apache.hadoop.hbase.regionserver.NoSuchColumnFamilyException: Column
>> > family ol does not exist in region <region>
>> >         at
>> >
>> org.apache.hadoop.hbase.regionserver.HRegion.checkFamily(HRegion.java:4759)
>> >         at
>> >
>> >
>> org.apache.hadoop.hbase.regionserver.HRegion.checkFamilies(HRegion.java:2639)
>> >         at
>> >
>> >
>> org.apache.hadoop.hbase.regionserver.HRegion.doMiniBatchMutation(HRegion.java:2065)
>> >         at
>> >
>> org.apache.hadoop.hbase.regionserver.HRegion.batchMutate(HRegion.java:1962)
>> >         at
>> >
>> >
>> org.apache.hadoop.hbase.regionserver.HRegionServer.multi(HRegionServer.java:3428)
>> >         at sun.reflect.GeneratedMethodAccessor23.invoke(Unknown Source)
>> >         at
>> >
>> >
>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>> >         at java.lang.reflect.Method.invoke(Method.java:601)
>> >         at
>> >
>> >
>> org.apache.hadoop.hbase.ipc.WritableRpcEngine$Server.call(WritableRpcEngine.java:364)
>> >         at
>> >
>> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1386)
>> > 2012-08-05 00:11:37,697 DEBUG
>> org.apache.hadoop.hbase.regionserver.HRegion:
>> > rollbackMemstore rolled back 0 keyvalues from start:0 to end:1
>> >
>> >
>> >
>> >
>> > On Tue, Aug 7, 2012 at 10:27 PM, Ted Yu <yuzhihong@gmail.com> wrote:
>> >
>> > > Looking at TableDeleteFamilyHandler, I see:
>> > >
>> > >   protected void handleTableOperation(List<HRegionInfo> hris) throws
>> > > IOException {
>> > >     // Update table descriptor in HDFS
>> > >     HTableDescriptor htd =
>> > >
>>  this.masterServices.getMasterFileSystem().deleteColumn(tableName,
>> > > familyName);
>> > >     // Update in-memory descriptor cache
>> > >     this.masterServices.getTableDescriptors().add(htd);
>> > >
>> > > MasterFileSystem.deleteColumn() calls:
>> > >
>> > >     HTableDescriptor htd =
>> > > this.services.getTableDescriptors().get(tableName);
>> > >     htd.removeFamily(familyName);
>> > >
>> > > I will dig some more.
>> > >
>> > > But looks like there is a bug.
>> > >
>> > > On Tue, Aug 7, 2012 at 9:21 AM, Stack <stack@duboce.net> wrote:
>> > >
>> > > > On Tue, Aug 7, 2012 at 9:59 AM, prem yadav <ipremyadav@gmail.com>
>> > wrote:
>> > > > > Hi Stack,
>> > > > > yes . I can still see the column family.
>> > > > >
>> > > > > we ran the following command too:
>> > > > >
>> > > > > fs -dus /hbase/<table name>/<region hash>/<cf
that was deleted>
>> and
>> > it
>> > > > > returned a large value which means that the space has not been
>> > > reclaimed.
>> > > > > The hbase version we are running is 0.94.1.
>> > > > >
>> > > > > is there  a manual way to force reclaim the space?
>> > > > >
>> > > >
>> > > > You could delete the column family from hdfs under each region.
>> > > > Anything in the logs around the remove of the column family?  Maybe
>> we
>> > > > just don't do the delete cleanup in hdfs when we drop a cf (I've not
>> > > > checked)?
>> > > >
>> > > > St.Ack
>> > > >
>> > >
>> >
>>
>>
>

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