[Bug] Too high SUnreclaim memery use and does not release memory

[lifeSo]

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Describe the bug

We launch 8 Shuffle Server machine, and there is one machine memory use is very high. After diagnose, we find there is SUnreclaim too high by run cmd :/etc/meminfo

Event though RSS process is down, the memory is not released.

Affects Version(s)

0.7.0

Uniffle Server Log Output

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Uniffle Engine Log Output

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Uniffle Server Configurations

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Uniffle Engine Configurations

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Additional context

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Are you willing to submit PR?

• [ ] Yes I am willing to submit a PR!

[rickyma]

Can you run jmap -histo:live to show what occupies the memory when the process of RSS Server is still alive? I think it will probably be io.netty.buffer.ReadOnlyByteBufferBuf from org.apache.uniffle.common.ShufflePartitionedBlock.

[lifeSo]

@rickyma We don't run the jmap -histo:live cmd, because we think the rss use memory is ok, it just use half of the memory from the pic above. And the machine restarted later. If the problem show next time, I think could run slabtop