Xiangdong Huang created COMDEV-411:
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Summary: Apache IoTDB: use netty as the memory buffer pool to
reduce GC problem and take full use of memory
Key: COMDEV-411
URL: https://issues.apache.org/jira/browse/COMDEV-411
Project: Community Development
Issue Type: Task
Components: GSoC/Mentoring ideas
Reporter: Xiangdong Huang
Apache IoTDB [1] is an Open Source IoT database designed to meet the rigorous
data, storage, and analytics requirements of large-scale Internet of Things
(IoT) and Industrial Internet of Things (IIoT) applications.
Memory control is very very important for DBMS.
Currently, we are using a customized memory buffer pool, which contains a pool
of int[], a pool of long[], a pool of boolean[] and as well as float[] and
double[].
However, there are two things left:
# it is complex to implement a buffer pool for String[] or byte[][], as the
size of String and byte[] are variable.
# We are using HeapByteBuffer, while in many cases, directByteBuffer is more
efficient.
As Netty has provided a high efficient buffer pool, we'd like to try to migrate
the current buffer pool to the Netty implementation.
Things you should know:
# Know Java well
# Know Netty well
# read codes of IoTDB (mainly in StorageEngine, StorageGroupProcessor and
related classes)
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