< Rocky> what does this exception mean `fail to execute comm StarRocks #questions-and-troubleshooting

<@U0A71G31CDV>, what does this exception mean? `fa...

Rich Mugge

06/02/2026, 12:24 AM

@Rocky, what does this exception mean?

fail to execute commit task: timeout by txn manager

What's a txn manager and is the timeout configurable?

Rocky

06/02/2026, 12:24 AM

This exception means that a transaction was aborted by the StarRocks Frontend (FE) Transaction Manager because it exceeded its allotted timeout period before completing. When you see

fail to execute commit task: timeout by txn manager

, it usually indicates that the data processing or the commit request took longer than the system was willing to wait. By the time the backend (BE) tried to finalize the transaction, the FE had already moved the transaction to an

ABORTED

state. What is the Transaction Manager? The Transaction Manager (specifically

GlobalTransactionMgr

in the FE) is the component responsible for managing the lifecycle of all data modification transactions (Stream Load, Routine Load, INSERT, etc.). It: * Assigns Transaction IDs. * Tracks the state of transactions (PREPARE, COMMITTED, VISIBLE, ABORTED). * Runs a background thread (

txnTimeoutChecker

) to automatically abort transactions that have been open for too long without finishing. Is the timeout configurable? Yes, the timeout is configurable, but the specific parameter depends on how you are loading data: 1. Routine Load (Kafka): * Configuration: It is set at the job level using the

TIMEOUT

property in your

CREATE ROUTINE LOAD

statement (default is usually 60s). * To fix: Alter the job to increase the timeout:

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        ALTER ROUTINE LOAD FOR job_name PROPERTIES ("timeout" = "120");

2. Stream Load: * Configuration: Controlled by the

timeout

header in the HTTP request (default 600s). * Global Default:

stream_load_default_timeout_second

fe.conf

. 3. INSERT INTO SELECT: * Configuration: Controlled by the session variable

insert_load_default_timeout_second

(default 3600s). * To fix:

SET insert_load_default_timeout_second = 7200;

4. Global Constraints (fe.conf): Regardless of the job-specific settings, the FE enforces global limits in `fe.conf`: * `max_load_timeout_second`: The absolute maximum time any load transaction can run (default 3 days). * `min_load_timeout_second`: The minimum allowed timeout (default 1s). Troubleshooting Steps * Check Transaction Details: Run

SHOW TRANSACTION WHERE id = <txn_id>;

to see the exact

PrepareTime

and

TimeoutMs

for the failed transaction. * Identify Bottlenecks: If timeouts happen frequently despite high settings, check for: * High BE Load: Backends might be too busy to process the commit. * Lock Contention: Large deletes or schema changes can block transactions. * Network Issues: Slow RPC communication between FE and BE. References • administration/management/BE_configuration.md • administration/management/FE_configuration.md

Rich Mugge

06/02/2026, 12:31 AM

@Rocky What's the correct syntax for this?

SET insert_load_default_timeout_second = 7200;

I get this when I try that:

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ERROR 1193 (HY000): Getting analyzing error. Detail message: Unknown system variable 'insert_load_default_timeout_second', the most similar variables are {'insert_timeout', 'cbo_enable_intersect_add_distinct', 'like_predicate_consolidate_min'}.

Rocky

06/02/2026, 12:31 AM

The error occurred because

insert_load_default_timeout_second

is an FE configuration parameter (set in the

fe.conf

file), not a session variable. For SQL statements, the correct session variable to use is

insert_timeout

. Correct Syntax To set the timeout for your current session:

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SET insert_timeout = 7200;

To set it globally for all future sessions (requires ADMIN privileges):

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SET GLOBAL insert_timeout = 7200;

Key Differences * insert_timeout
(Session Variable): This is what you should use in your SQL client. Since StarRocks v3.4.0, this variable specifically governs

INSERT

UPDATE

DELETE

, and

CTAS

operations, separating them from the standard

query_timeout

. * insert_load_default_timeout_second
(FE Config): This is a global default set in the

fe.conf

file on the Frontend nodes. It defines the initial default for the cluster, but is overridden by the session variable. Verification You can verify the current setting by running:

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SHOW VARIABLES LIKE 'insert_timeout';

References • loading/InsertInto.md • sql-reference/System_variable.md • faq/loading/Insert_into_faq.md References • loading/InsertInto.md • administration/management/FE_configuration.md • loading/loading_introduction/loading_considerations.md • sql-reference/System_variable.md • sql-reference/sql-statements/loading_unloading/ETL/SUBMIT_TASK.md • faq/loading/Insert_into_faq.md • sql-reference/sql-statements/loading_unloading/BROKER_LOAD.md

Rich Mugge

06/02/2026, 12:38 AM

@Rocky, the transaction I was using which timed out was in a simple

INSERT

statement from our app over JDBC. The transaction was open for less than 15 minutes. I can see

insert_load_default_timeout_second

was set to its default value of

, which should be an hour. Is there another config which could have caused the timeout?

Rocky

06/02/2026, 12:39 AM

The fact that your

insert_load_default_timeout_second

is set to 3600 (1 hour) but the task failed in ~15 minutes suggests that a session variable or a BE-side RPC timeout is overriding the global FE default. Here are the most likely configurations causing this: 1.
query_timeout
(The most common culprit) In StarRocks versions earlier than v3.4.0, all

INSERT

statements were governed by the

query_timeout

session variable. * Default: 300 seconds (5 minutes). * Even if your global FE config is 1 hour, the session's

query_timeout

takes precedence for the statement execution. * Solution: Increase it for your session or globally:

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    SET query_timeout = 3600;

2.
insert_timeout
(For v3.4.0+) If you are on v3.4.0 or newer, StarRocks introduced

insert_timeout

specifically for DML operations to avoid conflicts with standard query timeouts. * If this is set to a lower value (e.g., 900 seconds = 15 minutes) in your session or application's JDBC connection string, it will override the FE default. * Solution:

SET insert_timeout = 3600;

3.
streaming_load_rpc_max_alive_time_sec
(BE Config) Even if the FE Transaction Manager is willing to wait an hour, the Backends (BE) have their own internal RPC timeout for data loading tasks. * Default: 1200 seconds (20 minutes). * If the actual data writing phase on the BEs exceeds this limit, the BE may drop the task, leading the Transaction Manager to eventually report a timeout. * Check: Verify this in your

be.conf

. 4.
load_straggler_wait_second
(FE Config) This parameter defines how long the FE waits for "straggling" replicas to finish their work during the commit phase. * Default: 300 seconds (5 minutes). * If your cluster is under high load and some nodes are much slower than others, the transaction might be aborted if it can't reach a consensus within this window after the main work is done. ────────── How to confirm the exact cause To see exactly what timeout was applied to your failed transaction, run:

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-- Replace <txn_id> with the ID from your error message
SHOW TRANSACTION WHERE id = <txn_id>;

Look at the TimeoutMs
column in the result. * If

TimeoutMs

, then something (likely a session variable) explicitly set a 15-minute limit. * If

TimeoutMs

(1 hour) but it still failed early, the issue is likely a BE-side RPC timeout or a network/proxy interruption. Summary of what to change If you are using JDBC, it is best practice to set the session variables explicitly before running the insert:

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SET query_timeout = 3600;
SET insert_timeout = 3600; -- If on v3.4+
INSERT INTO ...;

-- References -- https://docs.starrocks.io/docs/sql-reference/System_variable -- https://docs.starrocks.io/docs/administration/management/FE_configuration ``` ## References - [administration/management/FE_configuration.md](https://docs.starrocks.io/docs/administration/management/FE_configuration) - [administration/management/BE_configuration.md](https://docs.starrocks.io/docs/administration/management/BE_configuration) - [faq/loading/Loading_faq.md](https://docs.starrocks.io/docs/faq/loading/Loading_faq)

Rich Mugge

06/02/2026, 12:43 AM

@Rocky, if I have an

INSERT... SELECT

, are both insert_timeout
and

query_timeout

going to impact my query?

Rocky

06/02/2026, 12:43 AM

Whether both impact your query depends entirely on which StarRocks version you are running. In short: They do not both impact the query at the same time. One takes precedence over the other depending on your version. 1. If you are on v3.4.0 or newer Starting with version 3.4.0, StarRocks explicitly separated these two variables to prevent long-running data loads from being killed by short query timeouts. * insert_timeout
: This is the only variable that governs

INSERT... SELECT

. It covers the entire duration of the operation (the

SELECT

part and the actual writing/committing of data). * query_timeout
: This variable is ignored for

INSERT

UPDATE

DELETE

, and

CTAS

statements. It now only applies to read-only

SELECT

statements. 2. If you are on a version older than v3.4.0 In older versions,

insert_timeout

did not exist as a session variable. * query_timeout
: This was the primary variable governing the execution time of the

INSERT... SELECT

statement. * insert_load_default_timeout_second
(FE Config): This defined the transaction's maximum life in the Transaction Manager. In these older versions, your query would fail if either the

query_timeout

was reached (killing the execution) or the transaction manager's timeout was reached. ────────── Why this matters for your
INSERT... SELECT
Because you previously saw the suggestion for

insert_timeout

in your error message, you are almost certainly on v3.4.0 or later. For your scenario: * Use
insert_timeout
to control the 15-minute failure you are seeing. * Ignore
query_timeout
for this specific task, as it no longer restricts

INSERT

operations in your version. Recommended Setting: If your JDBC app is doing a heavy

INSERT... SELECT

, set this at the start of your session:

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SET insert_timeout = 3600; -- Set to 1 hour
INSERT INTO target_table SELECT ... FROM source_table;

One Final Catch:
streaming_load_rpc_max_alive_time_sec
Even if

insert_timeout

is set to 1 hour, if the backends (BE) take more than 20 minutes (default) to process the data chunks, they might stop responding to the FE. If your task consistently fails around the 20-minute mark, you may also need to increase

streaming_load_rpc_max_alive_time_sec

in your be.conf. References • sql-reference/System_variable.md • faq/loading/Insert_into_faq.md • loading/InsertInto.md • administration/management/BE_configuration.md References • faq/loading/Insert_into_faq.md • sql-reference/System_variable.md • loading/InsertInto.md • loading/loading_introduction/loading_considerations.md • faq/resource_isolation_faq.md • administration/management/FE_configuration.md • sql-reference/sql-statements/loading_unloading/INSERT.md

Rich Mugge

06/02/2026, 12:55 AM

@Rocky, we're definitely on the latest 3.* version.

insert_timeout

is set to

insert_load_default_timeout_second

is set to

streaming_load_rpc_max_alive_time_sec

is set to

. On my most recent attempt, some batches timed out after only 10 minutes.

Rocky

06/02/2026, 12:55 AM

Since your timeout occurred at exactly 10 minutes (600 seconds), the most likely culprit is a specific internal StarRocks timeout that defaults to exactly that value. 1. The 10-Minute Internal Timeout (
tablet_writer_open_rpc_timeout_sec
) There is a configuration in the FE (Frontend) called

tablet_writer_open_rpc_timeout_sec

. * Default value: 600 seconds (10 minutes). * What it does: When an

INSERT

starts, the FE sends an RPC (Remote Procedure Call) to the BEs to "open" the tablet writers to prepare for data. If the cluster is under heavy load, has many tablets, or the schema is very complex, this "open" phase can take a long time. * Solution: Increase this in your

fe.conf

(requires FE restart) or check if it can be set via `ADMIN SET FRONTEND CONFIG`:

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    ADMIN SET FRONTEND CONFIG ("tablet_writer_open_rpc_timeout_sec" = "1200");

2. The Network/Proxy Timeout If you are connecting via a Load Balancer (F5, HAProxy, Nginx) or a Cloud Gateway (AWS ALB/NLB), 10 minutes (600s) is a very common default idle timeout. * If the StarRocks FE is busy processing the

SELECT

part of your

INSERT...SELECT

and doesn't send any data back to the JDBC client for 10 minutes, the proxy may drop the connection. * Check: Does the error message come from the MySQL/StarRocks driver, or does it look like a "Connection reset" or "Communication link failure"? 3. JDBC Socket Timeout Check your JDBC connection string. If you have a

socketTimeout

connectTimeout

parameter set, it will override any server-side settings. * Example:

jdbc:<mysql://host:9030/db?socketTimeout=600000>

(600,000ms = 10 minutes). 4.
query_timeout
(Version Verification) You mentioned you are on "the latest 3.* version." * If you are on v3.3.x, the

insert_timeout

variable does not exist yet. In v3.3,

INSERT

still follows

query_timeout

(default 300s). * If you are on v3.4.x,

insert_timeout

is the correct variable. * Verification: Run

SELECT VERSION();

. If it is

3.3.x

, you must increase

query_timeout

. Recommended Next Steps: 1. Check FE Logs: Look at

fe.log

fe.warn.log

for the specific Transaction ID. It will usually state exactly which timeout was triggered (e.g.,

"type:TIMEOUT, msg:tablet writer open timeout"

). 2. Verify the Transaction: Immediately after a failure, run:

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    SHOW TRANSACTION WHERE id = <txn_id>;

Look at the

TimeoutMs

column. If it says

, the 10-minute limit is being enforced by the FE configuration. References • administration/management/FE_configuration.md • faq/loading/Insert_into_faq.md • sql-reference/sql-statements/administration/ADMIN_SET_CONFIG.md • loading/InsertInto.md Into)

Rich Mugge

06/02/2026, 1:04 AM

@Rocky, it wasn't "exactly" 10 minutes. They failed when attempting to commit after about 10 minutes. An explicit

commit

fails and gives that exception so it could have happened at any point. Meanwhile, other transactions seem to have finished successfully after about 12 minutes. I don't seem to have easy access to front end logs. Is there a way to just view recent transactions from within a StarRocks prompt?

Rocky

06/02/2026, 1:05 AM

To view recent transaction history directly from your StarRocks prompt, use the SHOW PROC
system and the SHOW LOAD
command. Since you don't have FE log access, these are your best tools for identifying failed transaction IDs and the reasons for their failure. 1. How to find Transaction IDs from the prompt Option A:
SHOW PROC
(The "Internal" View) StarRocks keeps a list of recent transactions in its internal process directory. 1. First, find your Database ID:

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    SHOW PROC '/transactions';

2. Then, use that ID (e.g.,

) to list finished transactions:

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    -- Replace 1001 with your DbId from the step above
    SHOW PROC '/transactions/1001/finished';

*This will return a list including

TxnId

Label

Status

, and Reason
(which often contains the specific timeout error).* Option B:
SHOW LOAD
(The "Job" View) Since

INSERT

statements are treated as load jobs, they often appear here.

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SHOW LOAD ORDER BY CreateTime DESC LIMIT 10;

Look for labels starting with

insert_

. The

ErrorMsg

column here is usually the most readable source for why a commit failed. ────────── 2. Why "About 10 Minutes"? Since your

insert_timeout

and

insert_load_default_timeout

are set much higher, but you are failing at ~10 minutes, check these three specific "hidden" configs: 1.
tablet_writer_open_rpc_timeout_sec
(Default: 300-600s) If you have a high number of tablets or a complex schema, the "opening" phase of the transaction (before data even flows) can time out. In some versions, the effective timeout is the minimum of this variable and half of your total load timeout. * Check/Set:

ADMIN SET FRONTEND CONFIG ("tablet_writer_open_rpc_timeout_sec" = "1200");

2.
external_table_commit_timeout_ms
(Default: 10s) Only relevant if you are inserting into an External Table (e.g., Hive, Iceberg). If the metadata operation on the external catalog takes too long during the

COMMIT

phase, it will fail. * Check/Set:

ADMIN SET FRONTEND CONFIG ("external_table_commit_timeout_ms" = "600000");

(10 minutes). 3. JDBC Driver
net_write_timeout
/
net_read_timeout
If the StarRocks FE is working hard to process the commit and doesn't "speak" back to the JDBC driver for a long window, the MySQL protocol itself can time out. * Solution: Try adding

?socketTimeout=1200000

to your JDBC connection string to ensure the client doesn't give up before the server does. Next Step Recommendation Run

SHOW PROC '/transactions/<db_id>/finished';

and look at the Reason
column for one of the failed rows. If it says "tablet writer open timeout" or "publish version timeout", you'll know exactly which internal RPC reached its limit. -- References -- https://docs.starrocks.io/docs/sql-reference/sql-statements/cluster-management/nodes_processes/SHOW_PROC -- https://docs.starrocks.io/docs/sql-reference/sql-statements/loading_unloading/SHOW_TRANSACTION -- https://docs.starrocks.io/docs/administration/management/FE_configuration References • sql-reference/sql-statements/cluster-management/nodes_processes/SHOW_PROC.md • sql-reference/sql-statements/loading_unloading/SHOW_TRANSACTION.md • administration/management/FE_configuration.md • loading/SQL_transaction.md • sql-reference/information_schema/be_txns.md • administration/management/BE_configuration.md • using_starrocks/running_queries.md

Rocky

06/02/2026, 1:05 AM

• faq/loading/Insert_into_faq.md • loading/InsertInto.md • sql-reference/System_variable.md • faq/loading/Loading_faq.md • using_starrocks/async_mv/troubleshooting_asynchronous_materialized_views.md • faq/operation_maintenance_faq.md • loading/loading_introduction/loading_considerations.md References • administration/management/BE_configuration.md • administration/management/FE_configuration.md • faq/loading/Loading_faq.md

Rich Mugge

06/02/2026, 1:08 AM

@Rocky, I found it:

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TransactionId: 2116006
             Label: 019e85c6-7e05-77f1-a165-bbdf7cefe4ef
       Coordinator: FE: starrocks-shared-data-cluster-fe-1.starrocks-shared-data-cluster-fe-search.starrocks.svc.cluster.local
 TransactionStatus: ABORTED
 LoadJobSourceType: INSERT_STREAMING
       PrepareTime: 2026-06-02 00:40:38
      PreparedTime: NULL
        CommitTime: NULL
       PublishTime: NULL
        FinishTime: 2026-06-02 00:45:43
            Reason: timeout by txn manager
ErrorReplicasCount: 0
        ListenerId: [2038642, 2038673, 2038700, 2038744, 2038765, 2038826, 2038852, 2038894, 2038937, 2039007, 2039062, 2039093, 2039143, 2039192, 2039234, 2039286, 2039347, 2039400, 2039458, 2039496, 2039543, 2039595, 2039642, 2039688, 2039748, 2039788, 2039847, 2039880, 2040035, 2040098, 2040169, 2040223, 2040287, 2040346, 2040429, 2040469, 2040517, 2040570, 2040619, 2040677, 2040724, 2040789, 2040844, 2040900, 2040957, 2041018, 2041075, 2041121, 2041154, 2041185, 2041225, 2041268, 2041301]
         TimeoutMs: 300000
 PreparedTimeoutMs: 86400000
            ErrMsg:

Now the question is why would it time out after 300000ms?

Rocky

06/02/2026, 1:09 AM

The value 300000
in your

TimeoutMs

column is exactly 300 seconds (5 minutes). This is the default value for the query_timeout
session variable. The fact that your transaction shows

instead of

14400000

(your

insert_timeout

) or

(your

insert_load_default_timeout_second

) tells us that StarRocks is ignoring your new settings and falling back to the default query timeout. Here is why this is happening and how to fix it: 1. You might be on a version older than v3.4.0 Even if you are on a "late 3.*" version, if it is v3.3.x or lower, the

insert_timeout

variable does not exist or is not honored for

INSERT

jobs. In these versions, query_timeout
is the only variable that controls the execution time of an

INSERT... SELECT

. * Fix: Run

SET query_timeout = 14400;

before your insert, or upgrade to v3.4.0+. 2. Session Variable Scope Issues Session variables like

insert_timeout

query_timeout

only apply to the current database connection. * If your JDBC application is using a Connection Pool (like HikariCP or Druid), the session where you executed

SET insert_timeout = 14400

might not be the same session that actually executes the

INSERT

or the

COMMIT

. * Fix: Ensure your application sets the variable as part of the "connection init SQL" or explicitly sets it globally:

SET GLOBAL insert_timeout = 14400;

(Note: Global settings only apply to new connections created after the change). 3. Explicit Transactions (
BEGIN ... COMMIT
) If you are using an explicit transaction block:

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BEGIN;
INSERT INTO ...;
COMMIT;

The timeout for the transaction is often inherited from the session's

query_timeout

at the moment the transaction starts. If the version is slightly older, the transaction manager defaults to 300s unless explicitly told otherwise via session variables it recognizes. 4.
INSERT_STREAMING
Specifics Your

LoadJobSourceType

INSERT_STREAMING

. This usually indicates a batch insert via the MySQL protocol (common in JDBC). * Verify the version:

SELECT VERSION();

* If you are on 3.4.x, check if

insert_timeout

is truly set in the active session:

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    SHOW VARIABLES LIKE '%timeout%';

* If you see

query_timeout

and

insert_timeout

, but your transaction is still hitting

300000ms

, then your version of StarRocks is likely still using

query_timeout

for the

INSERT_STREAMING

logic. Recommended Fix Try setting both variables to a high value in your session before running the load:

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SET query_timeout = 14400;
SET insert_timeout = 14400;
-- Then run your INSERT

If the

TimeoutMs

SHOW TRANSACTION

still shows

, then the limit is being forced by a global FE configuration. In that case, check the FE's streaming_load_default_timeout_second
(though its default is usually much higher than 300). References • sql-reference/System_variable.md • loading/InsertInto.md • faq/loading/Insert_into_faq.md • sql-reference/sql-statements/loading_unloading/INSERT.md References • sql-reference/System_variable.md • loading/InsertInto.md • loading/loading_introduction/loading_considerations.md • faq/loading/Insert_into_faq.md • faq/operation_maintenance_faq.md

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