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https://issues.apache.org/jira/browse/KUDU-3731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18066309#comment-18066309
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Gabriella Lotz commented on KUDU-3731:
--------------------------------------
Ksck output for 2026.03.17.:
{code:java}
...
Tablet Replica Count Summary
Statistic | Replica Count
----------------+---------------
Minimum | 8
First Quartile | 8
Median | 8
Third Quartile | 8
Maximum | 8
Total Count Summary
| Total Count
----------------+-------------
Masters | 1
Tablet Servers | 3
Tables | 1
Tablets | 8
Replicas | 24
==================
Warnings:
==================
Some masters have unsafe, experimental, or hidden flags set
OK{code}
Log findings:
{code:java}
# grep -i rebalanc /var/log/kudu/kudu-master.INFO | tail -20
I20260317 08:00:06.239782 821025 auto_leader_rebalancer.cc:125] leader
rebalance for table user_events
I20260317 08:00:06.239840 821025 auto_leader_rebalancer.cc:125] leader
rebalance for table time_series_table
I20260317 08:00:06.239856 821025 auto_leader_rebalancer.cc:125] leader
rebalance for table user_events
I20260317 08:00:06.239988 821025 auto_leader_rebalancer.cc:359] table:
user_events, leader rebalance finish, leader transfer count: 0
I20260317 08:00:06.240016 821025 auto_leader_rebalancer.cc:414] All tables'
leader rebalancing finished this round
I20260317 09:00:06.240218 821025 auto_leader_rebalancer.cc:125] leader
rebalance for table user_events
I20260317 09:00:06.240336 821025 auto_leader_rebalancer.cc:125] leader
rebalance for table time_series_table
I20260317 09:00:06.240382 821025 auto_leader_rebalancer.cc:125] leader
rebalance for table user_events
I20260317 09:00:06.240657 821025 auto_leader_rebalancer.cc:359] table:
user_events, leader rebalance finish, leader transfer count: 0
I20260317 09:00:06.240732 821025 auto_leader_rebalancer.cc:414] All tables'
leader rebalancing finished this round
I20260317 10:00:06.241026 821025 auto_leader_rebalancer.cc:125] leader
rebalance for table user_events
I20260317 10:00:06.241196 821025 auto_leader_rebalancer.cc:125] leader
rebalance for table time_series_table
I20260317 10:00:06.241241 821025 auto_leader_rebalancer.cc:125] leader
rebalance for table user_events
I20260317 10:00:06.241433 821025 auto_leader_rebalancer.cc:359] table:
user_events, leader rebalance finish, leader transfer count: 0
I20260317 10:00:06.241477 821025 auto_leader_rebalancer.cc:414] All tables'
leader rebalancing finished this round
I20260317 11:00:06.241743 821025 auto_leader_rebalancer.cc:125] leader
rebalance for table user_events
I20260317 11:00:06.241837 821025 auto_leader_rebalancer.cc:125] leader
rebalance for table time_series_table
I20260317 11:00:06.241860 821025 auto_leader_rebalancer.cc:125] leader
rebalance for table user_events
I20260317 11:00:06.242039 821025 auto_leader_rebalancer.cc:359] table:
user_events, leader rebalance finish, leader transfer count: 0
I20260317 11:00:06.242084 821025 auto_leader_rebalancer.cc:414] All tables'
leader rebalancing finished this round {code}
> Long-running smoke test
> -----------------------
>
> Key: KUDU-3731
> URL: https://issues.apache.org/jira/browse/KUDU-3731
> Project: Kudu
> Issue Type: Sub-task
> Reporter: Gabriella Lotz
> Assignee: Gabriella Lotz
> Priority: Major
>
> h4. Step 0: Start a cluster with 1 master and 3 tablet servers.
> h4. Step 1: Set the following flags.
> --auto_rebalancing_enabled=true
> --auto_rebalancing_interval_seconds=60
> --auto_leader_rebalancing_enabled=true
> h4. Step 2: Create the following tables.
> {code:java}
> kudu table create <master> '{
> "table_name": "user_events",
> "schema": {
> "columns": [
> {"column_name": "user_id", "column_type": "STRING", "is_nullable":
> false},
> {"column_name": "event_id", "column_type": "INT64", "is_nullable":
> false},
> {"column_name": "data", "column_type": "STRING", "is_nullable":
> true}
> ],
> "key_column_names": ["user_id", "event_id"]
> },
> "partition": {
> "hash_partitions": [{"columns": ["user_id", "event_id"], "num_buckets":
> 8}]
> },
> "num_replicas": 3
> }'
> kudu table create <master> '{
> "table_name": "time_series_table",
> "schema": {
> "columns": [
> {"column_name": "ts", "column_type": "UNIXTIME_MICROS",
> "is_nullable": false},
> {"column_name": "sensor_id", "column_type": "STRING",
> "is_nullable": false},
> {"column_name": "value", "column_type": "DOUBLE",
> "is_nullable": true}
> ],
> "key_column_names": ["ts", "sensor_id"]
> },
> "partition": {
> "range_partition": {
> "columns": ["ts"],
> "range_bounds": [
> {"upper_bound": {"bound_type": "exclusive", "bound_values":
> ["1704067200000000"]}},
> {
> "lower_bound": {"bound_type": "inclusive", "bound_values":
> ["1704067200000000"]},
> "upper_bound": {"bound_type": "exclusive", "bound_values":
> ["1735689600000000"]}
> },
> {"lower_bound": {"bound_type": "inclusive", "bound_values":
> ["1735689600000000"]}}
> ]
> }
> },
> "num_replicas": 3
> }' {code}
> h4. Step 3: Start loadgen in tmux
> tmux new -s smoke
> Inside tmux:
> while true; do
> kudu perf loadgen <master> \
> --table_name=user_events \
> --num_threads=4 \
> --num_rows_per_thread=500000 \
> --flush_per_n_rows=1000 \
> --run_cleanup # cleanup so that disk doesn't fill up
> sleep 10
> done
> h4. Step 4: Monitor findings for 2 weeks. (start 2026.03.13.)
> # Is cluster healthy?
> kudu cluster ksck <master>
> # Check whether auto-rebalancer is running.
> grep -i rebalanc /var/log/kudu/kudu-master.INFO | tail -20
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