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HBase, mail # user - How to create HTableInterface in coprocessor?


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Re: How to create HTableInterface in coprocessor?
Ted Yu 2013-10-23, 21:53
Yong:
I have attached the backport to HBASE-9819.

If you can patch your build and see if it fixes the problem, that would be
great.
On Tue, Oct 22, 2013 at 2:58 PM, Ted Yu <[EMAIL PROTECTED]> wrote:

> Yong:
> There is unit test exercising CoprocessorEnvironment.getTable().
> See src/test/java/org/apache/hadoop/hbase/coprocessor/TestOpenTableInCoprocessor.java
> :
>
>       HTableInterface table = e.getEnvironment().getTable(otherTable);
>       Put p = new Put(new byte[] { 'a' });
>       p.add(family, null, new byte[] { 'a' });
>       table.put(put);
>
> If you can modify the above test to show how the exception is reproduced,
> that would help us fully understand the case and verify the fix.
>
> Thanks
>
>
> On Tue, Oct 22, 2013 at 12:51 PM, Ted Yu <[EMAIL PROTECTED]> wrote:
>
>> I logged HBASE-9819 to backport HBASE-8372 'Provide mutability to
>> CompoundConfiguration' to 0.94
>>
>> If you have time, you can work on the backport.
>>
>> Cheers
>>
>>
>> On Tue, Oct 22, 2013 at 11:56 AM, yonghu <[EMAIL PROTECTED]> wrote:
>>
>>> Hi Ted,
>>>
>>> This is because I tried different ways to generate a HTableInterface.
>>>
>>> One is as Gray mentioned, use RegionCoprocessorEnvironment "rce" to
>>> create
>>> a HTableInterface "td", but it did not work. So I commented it.
>>>
>>> Later I tried the approach which is suggested by
>>> http://hbase.apache.org/book.html#client.connections. First create a
>>> HConnection "hc", and then create a  HTableInterface "td". It still did
>>> not
>>> work.
>>>
>>> Both of them return the same error messages. Such as:
>>>
>>> ERROR: org.apache.hadoop.hbase.
>>> client.RetriesExhaustedWithDetailsException: Failed 1 action:
>>> org.apache.hadoop.hbase.DoNotRetryIOException: Coprocessor:
>>>
>>> 'org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost$RegionEnvironment@9a99eb
>>> '
>>> threw: 'java.lang.UnsupportedOperationException: Immutable Configuration'
>>> and has been removedfrom the active coprocessor set.
>>>     at
>>>
>>> org.apache.hadoop.hbase.coprocessor.CoprocessorHost.handleCoprocessorThrowable(CoprocessorHost.java:740)
>>>     at
>>>
>>> org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost.prePut(RegionCoprocessorHost.java:810)
>>> .............................
>>>
>>> and indicate the errors caused by rce.getTable() or hc.getTable().
>>>
>>> regards!
>>>
>>> Yong
>>>
>>>
>>> On Tue, Oct 22, 2013 at 8:42 PM, Ted Yu <[EMAIL PROTECTED]> wrote:
>>>
>>> > There're two types of exceptions. In the code below, I saw
>>> rce.getTable()
>>> > being commented out.
>>> >
>>> > Can you tell us the correlation between types of exception and
>>> getTable()
>>> > calls ?
>>> >
>>> > Thanks
>>> >
>>> >
>>> > On Tue, Oct 22, 2013 at 11:24 AM, yonghu <[EMAIL PROTECTED]>
>>> wrote:
>>> >
>>> > > public void prePut(ObserverContext<RegionCoprocessorEnvironment> e,
>>> Put
>>> > > put, WALEdit edit, boolean writeToWAL){
>>> > >         RegionCoprocessorEnvironment rce = e.getEnvironment();
>>> > > HTableInterface td = null;
>>> > >         HTableDescriptor htd = hr.getTableDesc();
>>> > >         Configuration conf = rce.getConfiguration();
>>> > >         HConnection hc = null;
>>> > >         try {
>>> > >             hc = HConnectionManager.createConnection(conf);
>>> > >         } catch (ZooKeeperConnectionException e1) {
>>> > >             // TODO Auto-generated catch block
>>> > >             e1.printStackTrace();
>>> > >         }
>>> > >         try {
>>> > >             td = hc.getTable(Bytes.toBytes(tracking));
>>> > >         } catch (IOException e1) {
>>> > >             // TODO Auto-generated catch block
>>> > >             e1.printStackTrace();
>>> > >         }
>>> > >         try {
>>> > >             //td = rce.getTable(Bytes.toBytes(tracking));
>>> > >             Put p = new Put(put.getRow());
>>> > >             p.add(Bytes.toBytes("Value"), Bytes.toBytes("Current"),
>>> > > Bytes.toBytes(1));
>>> > >             td.put(p);
>>> > >         } catch (IOException e2) {