Re: [Postgres-xc-developers] Add a new node to the cluster [Feature ID 3608379]

[Abbas B. <abb...@en...>]

On Mon, Apr 1, 2013 at 8:21 AM, Koichi Suzuki <koi...@gm...>wrote:

> Thank you very much for the summary.   It helps much.
>
> I have a couple of questions on this.
> ----------
> Koichi Suzuki
>
>
> 2013/3/31 Abbas Butt <abb...@en...>
>
>> Hi,
>> Attached please find the revised patch for restore mode. This patch has
>> to be applied on top of the patches I sent earlier for
>>  3608377,
>>  3608376 &
>>  3608375.
>>
>> I have also attached some scripts and a C file useful for testing the
>> whole procedure. It is a database that has many objects in it.
>>
>> Here are the revised instructions for adding new nodes to the cluster.
>>
>> ======================================
>>
>> Here are the steps to add a new coordinator
>>
>>  1) Initdb new coordinator
>>   /usr/local/pgsql/bin/initdb -D /usr/local/pgsql/data_cord3 --nodename
>> coord_3
>>
>>  2) Make necessary changes in its postgresql.conf, in particular specify
>> new coordinator name and pooler port
>>
>>  3) Connect to any of the existing coordinators & lock the cluster for
>> backup, do not close this session
>>     ./psql postgres -p 5432
>>     select pgxc_lock_for_backup();
>>
>
>>  4) Connect to any of the existing coordinators and take backup of the
>> database
>>     ./pg_dumpall -p 5432 -s --include-nodes --dump-nodes
>> --file=/home/edb/Desktop/NodeAddition/revised_patches/misc_dumps/1100_all_objects_coord.sql
>>
>
>
> Here, because only the default database is available, if the user is not
> "postgres" or default database specified in initdb, we need to specify the
> database name (and the owner name, if necessary).   Similar comments to
> others.
>

Agreed, once can choose to specify the default database to connect to.


>
>>  5) Start the new coordinator specify --restoremode while starting the
>> coordinator
>>     ./postgres --restoremode -D ../data_cord3 -p 5455
>>
>
>>  6) Create the new database on the new coordinator - optional
>>     ./createdb test -p 5455
>>
>
> I believe that pg_dumpall copies the definition of existing databases and
> this operation is usually unnecessary. If new database is needed, then this
> should be created after the new coordinator is up and registered to all the
> other coordinators.
>

True, this is an optional step and would not be required in many cases.


>
>
>
>>  7) Restore the backup that was taken from an existing coordinator by
>> connecting to the new coordinator directly
>>     ./psql -d test -f
>> /home/edb/Desktop/NodeAddition/revised_patches/misc_dumps/1100_all_objects_coord.sql
>> -p 5455
>>
>
>>  8) Quit the new coordinator
>>
>>  9) Start the new coordinator as a by specifying --coordinator
>>     ./postgres --coordinator -D ../data_cord3 -p 5455
>>
>> 10) Create the new coordinator on rest of the coordinators and reload
>> configuration
>>      CREATE NODE COORD_3 WITH (HOST = 'localhost', type = 'coordinator',
>> PORT = 5455);
>>     SELECT pgxc_pool_reload();
>>
>> 11) Quit the session of step 3, this will unlock the cluster
>>
>> 12) The new coordinator is now ready
>>     ./psql test -p 5455
>>     create table test_new_coord(a int, b int);
>>     \q
>>     ./psql test -p 5432
>>     select * from test_new_coord;
>>
>> *======================================*
>> *======================================*
>>
>> Here are the steps to add a new datanode
>>
>>
>>  1) Initdb new datanode
>>     /usr/local/pgsql/bin/initdb -D /usr/local/pgsql/data3 --nodename
>> data_node_3
>>
>>  2) Make necessary changes in its postgresql.conf, in particular specify
>> new datanode name
>>
>>  3) Connect to any of the existing coordinators & lock the cluster for
>> backup, do not close this session
>>     ./psql postgres -p 5432
>>     select pgxc_lock_for_backup();
>>
>>  4) Connect to any of the existing datanodes and take backup of the
>> database
>>     ./pg_dumpall -p 15432 -s --include-nodes
>> --file=/home/edb/Desktop/NodeAddition/revised_patches/misc_dumps/1122_all_objects_dn1.sql
>>
>>  5) Start the new datanode specify --restoremode while starting the it
>>     ./postgres --restoremode -D ../data3 -p 35432
>>
>>  6) Restore the backup that was taken from an existing datanode by
>> connecting to the new datanode directly
>>      ./psql -d postgres -f
>> /home/edb/Desktop/NodeAddition/revised_patches/misc_dumps/1122_all_objects_dn1.sql
>> -p 35432
>>
>>  7) Quit the new datanode
>>
>
> Same comment as the coordinator.
>
>>
>>  8) Start the new datanode as a datanode by specifying --datanode
>>     ./postgres --datanode -D ../data3 -p 35432
>>
>>  9) Create the new datanode on all the coordinators and reload
>> configuration
>>     CREATE NODE DATA_NODE_3 WITH (HOST = 'localhost', type = 'datanode',
>> PORT = 35432);
>>     SELECT pgxc_pool_reload();
>>
>> 10) Quit the session of step 3, this will unlock the cluster
>>
>> 11) Redistribute data by using ALTER TABLE REDISTRIBUTE
>>
>> 12) The new daatnode is now ready
>>     ./psql test
>>     create table test_new_dn(a int, b int) distribute by replication;
>>     insert into test_new_dn values(1,2);
>>     EXECUTE DIRECT ON (data_node_1) 'SELECT * from test_new_dn';
>>     EXECUTE DIRECT ON (data_node_2) 'SELECT * from test_new_dn';
>>     EXECUTE DIRECT ON (data_node_3) 'SELECT * from test_new_dn';
>>
>> ======================================
>>
>> On Wed, Mar 27, 2013 at 5:02 PM, Abbas Butt <abb...@en...>wrote:
>>
>>> Feature ID 3608379
>>>
>>> On Fri, Mar 1, 2013 at 5:48 PM, Amit Khandekar <
>>> ami...@en...> wrote:
>>>
>>>> On 1 March 2013 01:30, Abbas Butt <abb...@en...> wrote:
>>>> >
>>>> >
>>>> > On Thu, Feb 28, 2013 at 12:44 PM, Amit Khandekar
>>>> > <ami...@en...> wrote:
>>>> >>
>>>> >>
>>>> >>
>>>> >> On 28 February 2013 10:23, Abbas Butt <abb...@en...>
>>>> wrote:
>>>> >>>
>>>> >>> Hi All,
>>>> >>>
>>>> >>> Attached please find a patch that provides a new command line
>>>> argument
>>>> >>> for postgres called --restoremode.
>>>> >>>
>>>> >>> While adding a new node to the cluster we need to restore the
>>>> schema of
>>>> >>> existing database to the new node.
>>>> >>> If the new node is a datanode and we connect directly to it, it
>>>> does not
>>>> >>> allow DDL, because it is in read only mode &
>>>> >>> If the new node is a coordinator, it will send DDLs to all the other
>>>> >>> coordinators which we do not want it to do.
>>>> >>
>>>> >>
>>>> >> What if we allow writes in standalone mode, so that we would
>>>> initialize
>>>> >> the new node using standalone mode instead of --restoremode ?
>>>> >
>>>> >
>>>> > Please take a look at the patch, I am using --restoremode in place of
>>>> > --coordinator & --datanode. I am not sure how would stand alone mode
>>>> fit in
>>>> > here.
>>>>
>>>> I was trying to see if we can avoid adding a new mode, instead, use
>>>> standalone mode for all the purposes for which restoremode is used.
>>>> Actually I checked the documentation, it says this mode is used only
>>>> for debugging or recovery purposes, so now I myself am a bit hesitent
>>>> about this mode for the purpose of restoring.
>>>>
>>>> >
>>>> >>
>>>> >>
>>>> >>>
>>>> >>> To provide ability to restore on the new node a new command line
>>>> argument
>>>> >>> is provided.
>>>> >>> It is to be provided in place of --coordinator OR --datanode.
>>>> >>> In restore mode both coordinator and datanode are internally
>>>> treated as a
>>>> >>> datanode.
>>>> >>> For more details see patch comments.
>>>> >>>
>>>> >>> After this patch one can add a new node to the cluster.
>>>> >>>
>>>> >>> Here are the steps to add a new coordinator
>>>> >>>
>>>> >>>
>>>> >>>  1) Initdb new coordinator
>>>> >>>         /usr/local/pgsql/bin/initdb -D /usr/local/pgsql/data_cord3
>>>> >>> --nodename coord_3
>>>> >>>
>>>> >>>  2) Make necessary changes in its postgresql.conf, in particular
>>>> specify
>>>> >>> new coordinator name and pooler port
>>>> >>>
>>>> >>>  3) Connect to any of the existing coordinators & lock the cluster
>>>> for
>>>> >>> backup
>>>> >>>         ./psql postgres -p 5432
>>>> >>>         SET xc_lock_for_backup=yes;
>>>> >>>         \q
>>>> >>
>>>> >>
>>>> >> I haven't given a thought on the earlier patch you sent for cluster
>>>> lock
>>>> >> implementation; may be we can discuss this on that thread, but just
>>>> a quick
>>>> >> question:
>>>> >>
>>>> >> Does the cluster-lock command wait for the ongoing DDL commands to
>>>> finish
>>>> >> ? If not, we have problems. The subsequent pg_dump would not contain
>>>> objects
>>>> >> created by these particular DDLs.
>>>> >
>>>> >
>>>> > Suppose you have a two coordinator cluster. Assume one client
>>>> connected to
>>>> > each. Suppose one client issues a lock cluster command and the other
>>>> issues
>>>> > a DDL. Is this what you mean by an ongoing DDL? If true then answer
>>>> to your
>>>> > question is Yes.
>>>> >
>>>> > Suppose you have a prepared transaction that has a DDL in it, again
>>>> if this
>>>> > can be considered an on going DDL, then again answer to your question
>>>> is
>>>> > Yes.
>>>> >
>>>> > Suppose you have a two coordinator cluster. Assume one client
>>>> connected to
>>>> > each. One client starts a transaction and issues a DDL, the second
>>>> client
>>>> > issues a lock cluster command, the first commits the transaction. If
>>>> this is
>>>> > an ongoing DDL, then the answer to your question is No. But its a
>>>> matter of
>>>> > deciding which camp are we going to put COMMIT in, the allow camp, or
>>>> the
>>>> > deny camp. I decided to put it in allow camp, because I have not yet
>>>> written
>>>> > any code to detect whether a transaction being committed has a DDL in
>>>> it or
>>>> > not, and stopping all transactions from committing looks too
>>>> restrictive to
>>>> > me.
>>>> >
>>>> > Do you have some other meaning of an ongoing DDL?
>>>> >
>>>> > I agree that we should have discussed this on the right thread. Lets
>>>> > continue this discussion on that thread.
>>>>
>>>> Continued on the other thread.
>>>>
>>>> >
>>>> >>
>>>> >>
>>>> >>>
>>>> >>>
>>>> >>>  4) Connect to any of the existing coordinators and take backup of
>>>> the
>>>> >>> database
>>>> >>>         ./pg_dump -p 5432 -C -s
>>>> >>>
>>>> --file=/home/edb/Desktop/NodeAddition/dumps/101_all_objects_coord.sql test
>>>> >>>
>>>> >>>  5) Start the new coordinator specify --restoremode while starting
>>>> the
>>>> >>> coordinator
>>>> >>>         ./postgres --restoremode -D ../data_cord3 -p 5455
>>>> >>>
>>>> >>>  6) connect to the new coordinator directly
>>>> >>>         ./psql postgres -p 5455
>>>> >>>
>>>> >>>  7) create all the datanodes and the rest of the coordinators on
>>>> the new
>>>> >>> coordiantor & reload configuration
>>>> >>>         CREATE NODE DATA_NODE_1 WITH (HOST = 'localhost', type =
>>>> >>> 'datanode', PORT = 15432, PRIMARY);
>>>> >>>         CREATE NODE DATA_NODE_2 WITH (HOST = 'localhost', type =
>>>> >>> 'datanode', PORT = 25432);
>>>> >>>
>>>> >>>         CREATE NODE COORD_1 WITH (HOST = 'localhost', type =
>>>> >>> 'coordinator', PORT = 5432);
>>>> >>>         CREATE NODE COORD_2 WITH (HOST = 'localhost', type =
>>>> >>> 'coordinator', PORT = 5433);
>>>> >>>
>>>> >>>         SELECT pgxc_pool_reload();
>>>> >>>
>>>> >>>  8) quit psql
>>>> >>>
>>>> >>>  9) Create the new database on the new coordinator
>>>> >>>         ./createdb test -p 5455
>>>> >>>
>>>> >>> 10) create the roles and table spaces manually, the dump does not
>>>> contain
>>>> >>> roles or table spaces
>>>> >>>         ./psql test -p 5455
>>>> >>>         CREATE ROLE admin WITH LOGIN CREATEDB CREATEROLE;
>>>> >>>         CREATE TABLESPACE my_space LOCATION
>>>> >>> '/usr/local/pgsql/my_space_location';
>>>> >>>         \q
>>>> >>>
>>>> >>
>>>> >> Will pg_dumpall help ? It dumps roles also.
>>>> >
>>>> >
>>>> > Yah , but I am giving example of pg_dump so this step has to be there.
>>>> >
>>>> >>
>>>> >>
>>>> >>
>>>> >>>
>>>> >>> 11) Restore the backup that was taken from an existing coordinator
>>>> by
>>>> >>> connecting to the new coordinator directly
>>>> >>>          ./psql -d test -f
>>>> >>> /home/edb/Desktop/NodeAddition/dumps/101_all_objects_coord.sql -p
>>>> 5455
>>>> >>>
>>>> >>> 11) Quit the new coordinator
>>>> >>>
>>>> >>> 12) Connect to any of the existing coordinators & unlock the cluster
>>>> >>>         ./psql postgres -p 5432
>>>> >>>         SET xc_lock_for_backup=no;
>>>> >>>         \q
>>>> >>>
>>>> >>
>>>> >> Unlocking the cluster has to be done *after* the node is added into
>>>> the
>>>> >> cluster.
>>>> >
>>>> >
>>>> > Very true. I stand corrected. This means CREATE NODE has to be
>>>> allowed when
>>>> > xc_lock_for_backup is set.
>>>> >
>>>> >>
>>>> >>
>>>> >>
>>>> >>>
>>>> >>> 13) Start the new coordinator as a by specifying --coordinator
>>>> >>>         ./postgres --coordinator -D ../data_cord3 -p 5455
>>>> >>>
>>>> >>> 14) Create the new coordinator on rest of the coordinators and
>>>> reload
>>>> >>> configuration
>>>> >>>         CREATE NODE COORD_3 WITH (HOST = 'localhost', type =
>>>> >>> 'coordinator', PORT = 5455);
>>>> >>>         SELECT pgxc_pool_reload();
>>>> >>>
>>>> >>> 15) The new coordinator is now ready
>>>> >>>         ./psql test -p 5455
>>>> >>>         create table test_new_coord(a int, b int);
>>>> >>>         \q
>>>> >>>         ./psql test -p 5432
>>>> >>>         select * from test_new_coord;
>>>> >>>
>>>> >>>
>>>> >>> Here are the steps to add a new datanode
>>>> >>>
>>>> >>>
>>>> >>>  1) Initdb new datanode
>>>> >>>         /usr/local/pgsql/bin/initdb -D /usr/local/pgsql/data3
>>>> --nodename
>>>> >>> data_node_3
>>>> >>>
>>>> >>>  2) Make necessary changes in its postgresql.conf, in particular
>>>> specify
>>>> >>> new datanode name
>>>> >>>
>>>> >>>  3) Connect to any of the existing coordinators & lock the cluster
>>>> for
>>>> >>> backup
>>>> >>>         ./psql postgres -p 5432
>>>> >>>         SET xc_lock_for_backup=yes;
>>>> >>>         \q
>>>> >>>
>>>> >>>  4) Connect to any of the existing datanodes and take backup of the
>>>> >>> database
>>>> >>>         ./pg_dump -p 15432 -C -s
>>>> >>> --file=/home/edb/Desktop/NodeAddition/dumps/102_all_objects_dn1.sql
>>>> test
>>>> >>>
>>>> >>>  5) Start the new datanode specify --restoremode while starting the
>>>> it
>>>> >>>         ./postgres --restoremode -D ../data3 -p 35432
>>>> >>>
>>>> >>>  6) Create the new database on the new datanode
>>>> >>>         ./createdb test -p 35432
>>>> >>>
>>>> >>>  7) create the roles and table spaces manually, the dump does not
>>>> contain
>>>> >>> roles or table spaces
>>>> >>>         ./psql test -p 35432
>>>> >>>         CREATE ROLE admin WITH LOGIN CREATEDB CREATEROLE;
>>>> >>>         CREATE TABLESPACE my_space LOCATION
>>>> >>> '/usr/local/pgsql/my_space_location';
>>>> >>>         \q
>>>> >>>
>>>> >>>  8) Restore the backup that was taken from an existing datanode by
>>>> >>> connecting to the new datanode directly
>>>> >>>          ./psql -d test -f
>>>> >>> /home/edb/Desktop/NodeAddition/dumps/102_all_objects_dn1.sql -p
>>>> 35432
>>>> >>>
>>>> >>>  9) Quit the new datanode
>>>> >>>
>>>> >>> 10) Connect to any of the existing coordinators & unlock the cluster
>>>> >>>         ./psql postgres -p 5432
>>>> >>>         SET xc_lock_for_backup=no;
>>>> >>>         \q
>>>> >>>
>>>> >>> 11) Start the new datanode as a datanode by specifying --datanode
>>>> >>>         ./postgres --datanode -D ../data3 -p 35432
>>>> >>>
>>>> >>> 12) Create the new datanode on all the coordinators and reload
>>>> >>> configuration
>>>> >>>         CREATE NODE DATA_NODE_3 WITH (HOST = 'localhost', type =
>>>> >>> 'datanode', PORT = 35432);
>>>> >>>         SELECT pgxc_pool_reload();
>>>> >>>
>>>> >>> 13) Redistribute data by using ALTER TABLE REDISTRIBUTE
>>>> >>>
>>>> >>> 14) The new daatnode is now ready
>>>> >>>         ./psql test
>>>> >>>         create table test_new_dn(a int, b int) distribute by
>>>> replication;
>>>> >>>         insert into test_new_dn values(1,2);
>>>> >>>         EXECUTE DIRECT ON (data_node_1) 'SELECT * from test_new_dn';
>>>> >>>         EXECUTE DIRECT ON (data_node_2) 'SELECT * from test_new_dn';
>>>> >>>         EXECUTE DIRECT ON (data_node_3) 'SELECT * from test_new_dn';
>>>> >>>
>>>> >>> Please note that the steps assume that the patch sent earlier
>>>> >>> 1_lock_cluster.patch in mail subject [Patch to lock cluster] is
>>>> applied.
>>>> >>>
>>>> >>> I have also attached test database scripts, that would help in patch
>>>> >>> review.
>>>> >>>
>>>> >>> Comments are welcome.
>>>> >>>
>>>> >>> --
>>>> >>> Abbas
>>>> >>> Architect
>>>> >>> EnterpriseDB Corporation
>>>> >>> The Enterprise PostgreSQL Company
>>>> >>>
>>>> >>> Phone: 92-334-5100153
>>>> >>>
>>>> >>> Website: www.enterprisedb.com
>>>> >>> EnterpriseDB Blog: http://blogs.enterprisedb.com/
>>>> >>> Follow us on Twitter: http://www.twitter.com/enterprisedb
>>>> >>>
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>>>> >>
>>>> >
>>>> >
>>>> >
>>>> > --
>>>> > --
>>>> > Abbas
>>>> > Architect
>>>> > EnterpriseDB Corporation
>>>> > The Enterprise PostgreSQL Company
>>>> >
>>>> > Phone: 92-334-5100153
>>>> >
>>>> > Website: www.enterprisedb.com
>>>> > EnterpriseDB Blog: http://blogs.enterprisedb.com/
>>>> > Follow us on Twitter: http://www.twitter.com/enterprisedb
>>>> >
>>>> > This e-mail message (and any attachment) is intended for the use of
>>>> > the individual or entity to whom it is addressed. This message
>>>> > contains information from EnterpriseDB Corporation that may be
>>>> > privileged, confidential, or exempt from disclosure under applicable
>>>> > law. If you are not the intended recipient or authorized to receive
>>>> > this for the intended recipient, any use, dissemination, distribution,
>>>> > retention, archiving, or copying of this communication is strictly
>>>> > prohibited. If you have received this e-mail in error, please notify
>>>> > the sender immediately by reply e-mail and delete this message.
>>>>
>>>
>>>
>>>
>>> --
>>> --
>>> Abbas
>>> Architect
>>> EnterpriseDB Corporation
>>> The Enterprise PostgreSQL Company
>>>
>>> Phone: 92-334-5100153
>>>
>>> Website: www.enterprisedb.com
>>> EnterpriseDB Blog: http://blogs.enterprisedb.com/
>>> Follow us on Twitter: http://www.twitter.com/enterprisedb
>>>
>>> This e-mail message (and any attachment) is intended for the use of
>>> the individual or entity to whom it is addressed. This message
>>> contains information from EnterpriseDB Corporation that may be
>>> privileged, confidential, or exempt from disclosure under applicable
>>> law. If you are not the intended recipient or authorized to receive
>>> this for the intended recipient, any use, dissemination, distribution,
>>> retention, archiving, or copying of this communication is strictly
>>> prohibited. If you have received this e-mail in error, please notify
>>> the sender immediately by reply e-mail and delete this message.
>>
>>
>>
>>
>> --
>> --
>> Abbas
>> Architect
>> EnterpriseDB Corporation
>> The Enterprise PostgreSQL Company
>>
>> Phone: 92-334-5100153
>>
>> Website: www.enterprisedb.com
>> EnterpriseDB Blog: http://blogs.enterprisedb.com/
>> Follow us on Twitter: http://www.twitter.com/enterprisedb
>>
>> This e-mail message (and any attachment) is intended for the use of
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>


-- 
--
Abbas
Architect
EnterpriseDB Corporation
The Enterprise PostgreSQL Company

Phone: 92-334-5100153

Website: www.enterprisedb.com
EnterpriseDB Blog: http://blogs.enterprisedb.com/
Follow us on Twitter: http://www.twitter.com/enterprisedb

This e-mail message (and any attachment) is intended for the use of
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contains information from EnterpriseDB Corporation that may be
privileged, confidential, or exempt from disclosure under applicable
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