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new a4d221e21ca fix: Raise `start-druid` middleManager memory to 256m
(#19582)
a4d221e21ca is described below
commit a4d221e21cadda23b209e3d0247e9c8fe70c5c17
Author: Andreas Maechler <[email protected]>
AuthorDate: Mon Jun 15 16:10:20 2026 -0600
fix: Raise `start-druid` middleManager memory to 256m (#19582)
* Raise start-druid middleManager memory floor to 256m
The auto memory split in start-druid gives the middleManager the lowest
weight, so on a moderately sized machine it can be awarded a very small
heap: at `-m 16g` it gets only ~68m. The middleManager does not just fork
peons, it also runs an embedded HTTP server that proxies task reports and
logs back to callers (for example the web console polling a running query).
Under that proxying load a ~68m heap is exhausted, the middleManager exits
with an OutOfMemoryError, and the task it owns is reported as having
"disappeared on the worker".
Raise the middleManager minimum from 64m to 256m. 256m matches the heap
already shipped for the medium/large/xlarge single-server example configs.
The floor only affects deployments small enough that the proportional split
would fall below it (roughly under 60g total); larger deployments are
unchanged.
* Drop the explanatory comment on the middleManager floor
---
examples/bin/start-druid-main.py | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/examples/bin/start-druid-main.py b/examples/bin/start-druid-main.py
index cceb6ff60d9..f040f21c2f7 100644
--- a/examples/bin/start-druid-main.py
+++ b/examples/bin/start-druid-main.py
@@ -75,7 +75,7 @@ SERVICE_MEMORY_RATIO = {
}
MINIMUM_MEMORY_MB = {
- MIDDLE_MANAGER: 64,
+ MIDDLE_MANAGER: 256,
ROUTER: 256,
TASKS: 1024,
BROKER: 900,
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