Yuan Tian created IOTDB-4880:
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Summary: Memory leak in query processing
Key: IOTDB-4880
URL: https://issues.apache.org/jira/browse/IOTDB-4880
Project: Apache IoTDB
Issue Type: Bug
Components: Core/Query
Reporter: Yuan Tian
Assignee: Yuan Tian
Attachments: image-2022-11-08-20-13-21-385.png
In read and write mixed load, after about 90 mins, the query will be much
slower than before and the memory keeps highing and gc will keep active.
After dumping the memory heap, I found that instanceExecution Map in
FragmentInstanceManager is too large. Previously, it can be removed by cancel
rpc call from Coordinator, but after optimizing, Coordinator won't call cancel
rpc if the FI is already in done state. Unfortunately, when FI's state changing
to done, it doesn't remove itself from instanceExecution Map in
FragmentInstanceManager which causes this memory leak
!image-2022-11-08-20-13-21-385.png!
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