mirror of https://github.com/citusdata/citus.git
Add test for rebalancer with single shard tables
ahmet gedemenli
parent
f9dbe7784b
commit
ee42af7ad2
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@ -233,6 +233,243 @@ SELECT COUNT(*) = 0 FROM pg_dist_shard WHERE logicalrelid::text LIKE '%null_dist
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t
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(1 row)
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-- create 7 single shard tables, 3 of them are colocated, for testing shard moves / rebalance on them
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CREATE TABLE single_shard_table_col1_1 (a INT PRIMARY KEY);
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CREATE TABLE single_shard_table_col1_2 (a TEXT PRIMARY KEY);
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CREATE TABLE single_shard_table_col1_3 (a TIMESTAMP PRIMARY KEY);
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CREATE TABLE single_shard_table_col2_1 (a INT PRIMARY KEY);
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CREATE TABLE single_shard_table_col3_1 (a INT PRIMARY KEY);
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CREATE TABLE single_shard_table_col4_1 (a INT PRIMARY KEY);
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CREATE TABLE single_shard_table_col5_1 (a INT PRIMARY KEY);
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SELECT create_distributed_table('single_shard_table_col1_1', null, colocate_with=>'none');
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create_distributed_table
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---------------------------------------------------------------------
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(1 row)
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SELECT create_distributed_table('single_shard_table_col1_2', null, colocate_with=>'single_shard_table_col1_1');
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create_distributed_table
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---------------------------------------------------------------------
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(1 row)
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SELECT create_distributed_table('single_shard_table_col1_3', null, colocate_with=>'single_shard_table_col1_2');
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create_distributed_table
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---------------------------------------------------------------------
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(1 row)
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SELECT create_distributed_table('single_shard_table_col2_1', null, colocate_with=>'none');
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create_distributed_table
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---------------------------------------------------------------------
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(1 row)
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SELECT create_distributed_table('single_shard_table_col3_1', null, colocate_with=>'none');
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create_distributed_table
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---------------------------------------------------------------------
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(1 row)
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SELECT create_distributed_table('single_shard_table_col4_1', null, colocate_with=>'none');
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create_distributed_table
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---------------------------------------------------------------------
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(1 row)
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SELECT create_distributed_table('single_shard_table_col5_1', null, colocate_with=>'none');
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create_distributed_table
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---------------------------------------------------------------------
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(1 row)
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-- initial status
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SELECT shardid, nodeport FROM pg_dist_shard_placement WHERE shardid > 1820000 ORDER BY shardid;
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shardid | nodeport
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---------------------------------------------------------------------
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1820002 | 57638
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1820003 | 57638
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1820004 | 57638
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1820005 | 57637
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1820006 | 57638
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1820007 | 57637
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1820008 | 57638
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(7 rows)
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-- errors out because streaming replicated
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SELECT citus_copy_shard_placement(1820005, 'localhost', :worker_1_port, 'localhost', :worker_2_port);
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ERROR: Table 'single_shard_table_col2_1' is streaming replicated. Shards of streaming replicated tables cannot be copied
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SELECT master_copy_shard_placement(1820005, 'localhost', :worker_1_port, 'localhost', :worker_2_port);
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WARNING: do_repair argument is deprecated
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ERROR: Table 'single_shard_table_col2_1' is streaming replicated. Shards of streaming replicated tables cannot be copied
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SELECT citus_copy_shard_placement(1820005, :worker_1_node, :worker_2_node);
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ERROR: Table 'single_shard_table_col2_1' is streaming replicated. Shards of streaming replicated tables cannot be copied
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-- no changes because it's already balanced
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SELECT rebalance_table_shards();
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rebalance_table_shards
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---------------------------------------------------------------------
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(1 row)
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-- same placements
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SELECT shardid, nodeport FROM pg_dist_shard_placement WHERE shardid > 1820000 ORDER BY shardid;
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shardid | nodeport
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---------------------------------------------------------------------
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1820002 | 57638
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1820003 | 57638
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1820004 | 57638
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1820005 | 57637
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1820006 | 57638
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1820007 | 57637
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1820008 | 57638
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(7 rows)
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-- manually move 2 shard from 2 colocation groups to make the cluster unbalanced
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SELECT citus_move_shard_placement(1820005, 'localhost', :worker_1_port, 'localhost', :worker_2_port);
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citus_move_shard_placement
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---------------------------------------------------------------------
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(1 row)
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SELECT citus_move_shard_placement(1820007, :worker_1_node, :worker_2_node);
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citus_move_shard_placement
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---------------------------------------------------------------------
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(1 row)
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-- all placements are located on worker 2
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SELECT shardid, nodeport FROM pg_dist_shard_placement WHERE shardid > 1820000 ORDER BY shardid;
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shardid | nodeport
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---------------------------------------------------------------------
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1820002 | 57638
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1820003 | 57638
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1820004 | 57638
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1820005 | 57638
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1820006 | 57638
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1820007 | 57638
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1820008 | 57638
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(7 rows)
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-- move some of them to worker 1 to balance the cluster
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SELECT rebalance_table_shards();
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NOTICE: Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
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NOTICE: Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
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rebalance_table_shards
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---------------------------------------------------------------------
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(1 row)
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-- the final status, balanced
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SELECT shardid, nodeport FROM pg_dist_shard_placement WHERE shardid > 1820000 ORDER BY shardid;
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shardid | nodeport
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---------------------------------------------------------------------
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1820002 | 57637
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1820003 | 57637
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1820004 | 57637
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1820005 | 57637
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1820006 | 57638
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1820007 | 57638
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1820008 | 57638
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(7 rows)
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-- verify we didn't break any colocations
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SELECT logicalrelid, colocationid FROM pg_dist_partition WHERE logicalrelid::text LIKE '%single_shard_table_col%' ORDER BY colocationid;
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logicalrelid | colocationid
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---------------------------------------------------------------------
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single_shard_table_col1_1 | 198001
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single_shard_table_col1_2 | 198001
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single_shard_table_col1_3 | 198001
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single_shard_table_col2_1 | 198002
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single_shard_table_col3_1 | 198003
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single_shard_table_col4_1 | 198004
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single_shard_table_col5_1 | 198005
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(7 rows)
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-- again, manually move 2 shard from 2 colocation groups to make the cluster unbalanced
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-- consider using citus_drain_node when the issue is fixed: https://github.com/citusdata/citus/issues/6948
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SELECT citus_move_shard_placement(1820005, 'localhost', :worker_1_port, 'localhost', :worker_2_port);
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citus_move_shard_placement
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---------------------------------------------------------------------
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(1 row)
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SELECT citus_move_shard_placement(1820003, :worker_1_node, :worker_2_node);
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citus_move_shard_placement
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---------------------------------------------------------------------
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(1 row)
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-- see the plan for moving 4 shards, 3 of them are in the same colocation group
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SELECT * FROM get_rebalance_table_shards_plan();
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table_name | shardid | shard_size | sourcename | sourceport | targetname | targetport
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---------------------------------------------------------------------
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single_shard_table_col1_1 | 1820002 | 0 | localhost | 57638 | localhost | 57637
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single_shard_table_col1_2 | 1820003 | 0 | localhost | 57638 | localhost | 57637
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single_shard_table_col1_3 | 1820004 | 0 | localhost | 57638 | localhost | 57637
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single_shard_table_col2_1 | 1820005 | 0 | localhost | 57638 | localhost | 57637
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(4 rows)
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-- move some of them to worker 1 to balance the cluster
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SELECT 1 FROM citus_rebalance_start();
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NOTICE: Scheduled 2 moves as job xxx
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DETAIL: Rebalance scheduled as background job
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HINT: To monitor progress, run: SELECT * FROM citus_rebalance_status();
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?column?
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---------------------------------------------------------------------
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1
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(1 row)
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-- stop it
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SELECT * FROM citus_rebalance_stop();
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citus_rebalance_stop
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---------------------------------------------------------------------
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(1 row)
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-- show rebalance status, see the cancelled job for two moves
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SELECT state, details FROM citus_rebalance_status();
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state | details
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---------------------------------------------------------------------
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cancelled | {"tasks": [], "task_state_counts": {"cancelled": 2}}
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(1 row)
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-- start again
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SELECT 1 FROM citus_rebalance_start();
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NOTICE: Scheduled 2 moves as job xxx
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DETAIL: Rebalance scheduled as background job
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HINT: To monitor progress, run: SELECT * FROM citus_rebalance_status();
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?column?
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---------------------------------------------------------------------
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1
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(1 row)
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-- show rebalance status, scheduled a job for two moves
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SELECT state, details FROM citus_rebalance_status();
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state | details
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---------------------------------------------------------------------
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scheduled | {"tasks": [], "task_state_counts": {"runnable": 2}}
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(1 row)
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-- wait for rebalance to be completed
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SELECT * FROM citus_rebalance_wait();
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citus_rebalance_wait
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---------------------------------------------------------------------
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(1 row)
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-- the final status, balanced
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SELECT shardid, nodeport FROM pg_dist_shard_placement WHERE shardid > 1820000 ORDER BY shardid;
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shardid | nodeport
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---------------------------------------------------------------------
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1820002 | 57637
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1820003 | 57637
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1820004 | 57637
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1820005 | 57637
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1820006 | 57638
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1820007 | 57638
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1820008 | 57638
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(7 rows)
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-- test update_distributed_table_colocation
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CREATE TABLE update_col_1 (a INT);
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CREATE TABLE update_col_2 (a INT);
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@ -98,6 +98,81 @@ SELECT COUNT(*) = 0 FROM pg_dist_partition WHERE logicalrelid::text LIKE '%null_
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SELECT COUNT(*) = 0 FROM pg_dist_placement WHERE shardid IN (SELECT shardid FROM pg_dist_shard WHERE logicalrelid::text LIKE '%null_dist_key_table%');
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SELECT COUNT(*) = 0 FROM pg_dist_shard WHERE logicalrelid::text LIKE '%null_dist_key_table%';
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-- create 7 single shard tables, 3 of them are colocated, for testing shard moves / rebalance on them
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CREATE TABLE single_shard_table_col1_1 (a INT PRIMARY KEY);
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CREATE TABLE single_shard_table_col1_2 (a TEXT PRIMARY KEY);
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CREATE TABLE single_shard_table_col1_3 (a TIMESTAMP PRIMARY KEY);
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CREATE TABLE single_shard_table_col2_1 (a INT PRIMARY KEY);
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CREATE TABLE single_shard_table_col3_1 (a INT PRIMARY KEY);
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CREATE TABLE single_shard_table_col4_1 (a INT PRIMARY KEY);
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CREATE TABLE single_shard_table_col5_1 (a INT PRIMARY KEY);
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SELECT create_distributed_table('single_shard_table_col1_1', null, colocate_with=>'none');
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SELECT create_distributed_table('single_shard_table_col1_2', null, colocate_with=>'single_shard_table_col1_1');
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SELECT create_distributed_table('single_shard_table_col1_3', null, colocate_with=>'single_shard_table_col1_2');
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SELECT create_distributed_table('single_shard_table_col2_1', null, colocate_with=>'none');
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SELECT create_distributed_table('single_shard_table_col3_1', null, colocate_with=>'none');
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SELECT create_distributed_table('single_shard_table_col4_1', null, colocate_with=>'none');
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SELECT create_distributed_table('single_shard_table_col5_1', null, colocate_with=>'none');
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-- initial status
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SELECT shardid, nodeport FROM pg_dist_shard_placement WHERE shardid > 1820000 ORDER BY shardid;
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-- errors out because streaming replicated
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SELECT citus_copy_shard_placement(1820005, 'localhost', :worker_1_port, 'localhost', :worker_2_port);
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SELECT master_copy_shard_placement(1820005, 'localhost', :worker_1_port, 'localhost', :worker_2_port);
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SELECT citus_copy_shard_placement(1820005, :worker_1_node, :worker_2_node);
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-- no changes because it's already balanced
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SELECT rebalance_table_shards();
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-- same placements
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SELECT shardid, nodeport FROM pg_dist_shard_placement WHERE shardid > 1820000 ORDER BY shardid;
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-- manually move 2 shard from 2 colocation groups to make the cluster unbalanced
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SELECT citus_move_shard_placement(1820005, 'localhost', :worker_1_port, 'localhost', :worker_2_port);
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SELECT citus_move_shard_placement(1820007, :worker_1_node, :worker_2_node);
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-- all placements are located on worker 2
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SELECT shardid, nodeport FROM pg_dist_shard_placement WHERE shardid > 1820000 ORDER BY shardid;
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-- move some of them to worker 1 to balance the cluster
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SELECT rebalance_table_shards();
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-- the final status, balanced
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SELECT shardid, nodeport FROM pg_dist_shard_placement WHERE shardid > 1820000 ORDER BY shardid;
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-- verify we didn't break any colocations
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SELECT logicalrelid, colocationid FROM pg_dist_partition WHERE logicalrelid::text LIKE '%single_shard_table_col%' ORDER BY colocationid;
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-- again, manually move 2 shard from 2 colocation groups to make the cluster unbalanced
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-- consider using citus_drain_node when the issue is fixed: https://github.com/citusdata/citus/issues/6948
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SELECT citus_move_shard_placement(1820005, 'localhost', :worker_1_port, 'localhost', :worker_2_port);
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SELECT citus_move_shard_placement(1820003, :worker_1_node, :worker_2_node);
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-- see the plan for moving 4 shards, 3 of them are in the same colocation group
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SELECT * FROM get_rebalance_table_shards_plan();
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-- move some of them to worker 1 to balance the cluster
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SELECT 1 FROM citus_rebalance_start();
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-- stop it
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SELECT * FROM citus_rebalance_stop();
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-- show rebalance status, see the cancelled job for two moves
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SELECT state, details FROM citus_rebalance_status();
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-- start again
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SELECT 1 FROM citus_rebalance_start();
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-- show rebalance status, scheduled a job for two moves
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SELECT state, details FROM citus_rebalance_status();
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-- wait for rebalance to be completed
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SELECT * FROM citus_rebalance_wait();
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-- the final status, balanced
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SELECT shardid, nodeport FROM pg_dist_shard_placement WHERE shardid > 1820000 ORDER BY shardid;
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-- test update_distributed_table_colocation
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CREATE TABLE update_col_1 (a INT);
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CREATE TABLE update_col_2 (a INT);
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