SHOW REBALANCE ALL DATABASES STATUS
Shows the status of the currently executing REBALANCE ALL DATABASES
operation.
Syntax
SHOW REBALANCE ALL DATABASES STATUS;
Remarks
Alternatively, you can query the information schema view MV_REBALANCE_STATUS
, which returns the same output as the SHOW REBALANCE ALL DATABASES STATUS
command.
The Ordinal is the target partition’s ordinal, and the Target_Host and Target_Port correspond to the destination leaf. Any two operations in the same Phase can be run in parallel and phases are run in order. For example, the aggregator can run COPY PARTITION
on partitions test:1
and test:3
in parallel. The exact meaning of what each phase means is arbitrary and depends on the particular rebalance operation. The Estimated_Time_Remaining_Ms
is the estimated total time (in milliseconds) that each low-level command will take to complete.
Example
Run the following command to rebalance partitions on all databases in the cluster:
REBALANCE ALL DATABASES;
View the status of REBALANCE ALL DATABASES
while it is still running:
SHOW REBALANCE ALL DATABASES STATUS; **** +----------+-----------------------------------+---------+-------------+-------------+-------+-----------+--------------+-----------------------------+ | Database | Action | Ordinal | Target_Host | Target_Port | Phase | Status | Running_Time | Estimated_Time_Remaining_Ms | +----------+-----------------------------------+---------+-------------+-------------+-------+-----------+--------------+-----------------------------+ | x_db | COPY PARTITION | 13 | 127.0.0.1 | 10002 | 3 | success | 4009 | 0 | | x_db | COPY PARTITION | 2 | 127.0.0.1 | 10003 | 4 | success | 5109 | 0 | | x_db | COPY PARTITION | 2 | 127.0.0.1 | 10004 | 4 | success | 5112 | 0 | | x_db | PROMOTE PARTITION WITH DROP FORCE | 2 | 127.0.0.1 | 10003 | 5 | running | 405 | 1130 | | x_db | DROP PARTITION | 2 | 127.0.0.1 | 10002 | 6 | scheduled | NULL | 1002 | | x_db | DROP PARTITION | 13 | 127.0.0.1 | 10004 | 6 | scheduled | NULL | 1002 | +----------+-----------------------------------+---------+-------------+-------------+-------+-----------+--------------+-----------------------------+
Note: The Status
displays success
for the activities that are already complete. The Estimated_Time_Remaining_Ms
displays the estimated remaining time (in milliseconds) for each low-level command to complete.