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client-v2 retries an insert with the same query id after NoHttpResponseException, causing QUERY_WITH_SAME_ID_IS_ALREADY_RUNNING #3174
Client.insert reuses requestSettings.getQueryId() across every retry attempt. After NoHttpResponseException (retried by default via ClientFaultCause.NoHttpResponse) the first request may already have reached the server and still be executing. The second attempt is then rejected with Code: 216 QUERY_WITH_SAME_ID_IS_ALREADY_RUNNING, which is not retryable, so a transient transport fault becomes a hard failure.
#1721 introduced the retry and noted that "not every request may be retried safely". This is that case.
Steps to reproduce
client.insert(table, data, format, settings) with default retry settings through a proxy or load balancer.
The proxy closes the keep-alive connection after forwarding the request, while the server is still executing the insert (async_insert=1, wait_for_async_insert=1 makes the window at least the busy timeout).
The client gets NoHttpResponseException, logs Retrying., and resends with the same query id. The server answers 216.
Error Log or Exception StackTrace
WARN Retrying. (com.clickhouse.client.api.Client)
org.apache.hc.core5.http.NoHttpResponseException: <host>:8443 failed to respond
at org.apache.hc.core5.http.impl.io.DefaultBHttpClientConnection.receiveResponseHeader(DefaultBHttpClientConnection.java:333)
...
at com.clickhouse.client.api.internal.HttpAPIClientHelper.executeRequest(HttpAPIClientHelper.java:453)
at com.clickhouse.client.api.Client.lambda$insert$3(Client.java:1474)
at com.clickhouse.client.api.Client.runAsyncOperation(Client.java:2012)
at com.clickhouse.client.api.Client.insert(Client.java:1518)
com.clickhouse.client.api.ServerException: Code: 216. DB::Exception: Query with id = b266240e-d406-4874-ba3b-cd1b0bd969f8 is already running. (QUERY_WITH_SAME_ID_IS_ALREADY_RUNNING) (version 26.4.1.2359 (official build))
at com.clickhouse.client.api.internal.HttpAPIClientHelper.readError(HttpAPIClientHelper.java:403)
at com.clickhouse.client.api.internal.HttpAPIClientHelper.executeRequest(HttpAPIClientHelper.java:467)
at com.clickhouse.client.api.Client.lambda$insert$3(Client.java:1474)
at com.clickhouse.client.api.Client.runAsyncOperation(Client.java:2012)
at com.clickhouse.client.api.Client.insert(Client.java:1518)
at com.clickhouse.client.api.Client.insert(Client.java:1408)
Expected Behaviour
A retry after a fault where the first request may have been delivered does not collide with its own earlier attempt. Either the retry uses a fresh query id, or the client does not retry once the request body has been sent.
Configuration
Client Configuration
Defaults: retry=3, retryOnFailures = [NoHttpResponse, ConnectTimeout, ConnectionRequestTimeout, ServerRetryable]. Caller sets queryId and insert_deduplication_token per insert (clickhouse-kafka-connect v1.6.0).
Environment
Cloud
Client version: client-v2 0.9.5 (insert loop unchanged on 0.9.6, 0.10.0 and main)
Activity
chernser commentedon Oct 14, 2026
thank you for reporting this @billykern !
I will look into it.
billykern commentedon Oct 15, 2026
Thank you @chernser 🙏