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From anil gupta <anilgupt...@gmail.com>
Subject Re: Excessive region splitting of Global Index table(8 Megabyte regions)
Date Sat, 12 Mar 2016 20:23:14 GMT
Thanks for the reply, James. We have 2 global secondary index in this table
and both of them exhibit same behavior.  Going to give your suggestion a
try. I also think that regionsize for secondary index should not be 8GB.
Will try to set the regionsize=1GB for secondary index and see how it goes.

On Sat, Mar 12, 2016 at 12:00 PM, James Taylor <jamestaylor@apache.org>
wrote:

> Hi Anil,
> Phoenix estimates the ratio between the data table and index table as
> shown below to attempt to get the same number of splits in your index table
> as your data table.
>
> /*
>  * Approximate ratio between index table size and data table size:
>  * More or less equal to the ratio between the number of key value
>  * columns in each. We add one to the key value column count to
>  * take into account our empty key value. We add 1/4 for any key
>  * value data table column that was moved into the index table row key.
>  */
>
> Phoenix then multiples the MAX_FILESIZE of the data table to come up with
> a reasonable default value for the index table. Can you check in the HBase
> shell what the MAX_FILESIZE is for the data table versus the index table?
> Maybe there's a bug in Phoenix in how it calculates this ration.
>
> You can override the MAX_FILESIZE for your index through an ALTER TABLE
> statement:
>
> ALTER TABLE my_table_schema.my_index_name SET MAX_FILESIZE=8589934592
>
> You can ignore the warnings you get in sqlline and you can verify the
> setting took affect through the HBase shell by running the following
> command:
>
> describe 'MY_TABLE_SCHEMA.MY_INDEX_NAME'
>
> HTH,
>
>     James
>
>
> On Sat, Mar 12, 2016 at 10:18 AM, anil gupta <anilgupta84@gmail.com>
> wrote:
>
>> Hi,
>>
>> We are using HDP2.3.4 and Phoenix4.4.
>> Our global index table is doing excessive splitting. Our cluster region
>> size setting is 8 Gigabytes but global index table has 18 regions and max
>> size of region is 10.9 MB.
>> This is definitely not a good behavior. I looked into tuning (
>> https://phoenix.apache.org/tuning.html) and i could not find anything
>> relevant. Is this region splitting intentionally done by Phoenix for
>> secondary index tables?
>>
>> Here is the output of du command:
>> [ag@hdpclient1 ~]$ hadoop fs -du -h
>> /apps/hbase/data/data/default/SEC_INDEX
>> 761     /apps/hbase/data/data/default/SEC_INDEX/.tabledesc
>> 0       /apps/hbase/data/data/default/SEC_INDEX/.tmp
>> 9.3 M
>> /apps/hbase/data/data/default/SEC_INDEX/079db2c953c30a8270ecbd52582e81ff
>> 2.9 M
>> /apps/hbase/data/data/default/SEC_INDEX/0952c070234c05888bfc2a01645e9e88
>> 10.9 M
>> /apps/hbase/data/data/default/SEC_INDEX/0d69bbb8991b868f0437b624410e9bed
>> 8.2 M
>> /apps/hbase/data/data/default/SEC_INDEX/206562491fd1de9db48cf422dd8c2059
>> 7.9 M
>> /apps/hbase/data/data/default/SEC_INDEX/25318837ab8e1db6922f5081c840d2e7
>> 9.5 M
>> /apps/hbase/data/data/default/SEC_INDEX/5369e0d6526b3d2cdab9937cb320ccb3
>> 9.6 M
>> /apps/hbase/data/data/default/SEC_INDEX/62704ee3c9418f0cd48210a747e1f8ac
>> 7.8 M
>> /apps/hbase/data/data/default/SEC_INDEX/631376fc5515d7785b2bcfc8a1f64223
>> 2.8 M
>> /apps/hbase/data/data/default/SEC_INDEX/6648d5396ba7a3c3bf884e5e1300eb0e
>> 9.4 M
>> /apps/hbase/data/data/default/SEC_INDEX/6e6e133580aea9a19a6b3ea643735072
>> 8.1 M
>> /apps/hbase/data/data/default/SEC_INDEX/8535a5c8a0989dcdfad2b1e9e9f3e18c
>> 7.8 M
>> /apps/hbase/data/data/default/SEC_INDEX/8ffa32e0c6357c2a0b413f3896208439
>> 9.3 M
>> /apps/hbase/data/data/default/SEC_INDEX/c27e2809cd352e3b06c0f11d3e7278c6
>> 8.0 M
>> /apps/hbase/data/data/default/SEC_INDEX/c4f5a98ce6452a6b5d052964cc70595a
>> 8.1 M
>> /apps/hbase/data/data/default/SEC_INDEX/c578d3190363c32032b4d92c8d307215
>> 7.9 M
>> /apps/hbase/data/data/default/SEC_INDEX/d750860bac8aa372eb28aaf055ea63e7
>> 9.6 M
>> /apps/hbase/data/data/default/SEC_INDEX/e9756aa4c7c8b9bfcd0857b43ad5bfbe
>> 8.0 M
>> /apps/hbase/data/data/default/SEC_INDEX/ebaae6c152e82c9b74c473babaf644dd
>>
>> --
>> Thanks & Regards,
>> Anil Gupta
>>
>
>


-- 
Thanks & Regards,
Anil Gupta

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