openlookneng是否实现了oom-killer：在worker发生oom或堆内存超阈值时，kill占用内存最多的查询

[juechen507]

Software Environment:

• OpenLooKeng version (source or binary):

• OS platform & distribution (eg., Linux Ubuntu 16.04):

• Java version:

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Describe the expected behavior

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1. 2. 3.

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