[CI] Fix Tune Runner VM memory.swappiness no such file or directory

[Demogorgon314]

Failed CI: https://github.com/apache/pulsar/runs/4501006108?check_suite_focus=true#step:3:1

Motivation

The Tune Runner VM is flaky.

Sometimes, the parent directory of memory.swappiness can't find, we should check it first.

Run if [[ "$OSTYPE" == "linux-gnu"* ]]; then
10.1.0.235	fv-az198-145.gjkxsqtjg41etoza45cw35jkyb.bx.internal.cloudapp.net fv-az198-145
1
tee: /sys/fs/cgroup/memory/system.slice/snap-snapd-13640.mount/memory.swappiness: No such file or directory
Error: Process completed with exit code 1.

Modifications

Add a check of the parent directory of memory.swappiness

Documentation

• no-need-doc

[Demogorgon314]

/pulsarbot run-failure-checks

[Demogorgon314]

/pulsarbot run-failure-checks

[codelipenghui]

@timmyyuan Please help review this PR.

[lhotari]

This was the wrong solution to the problem. The change makes the shell script basically a no-op.

The correct solution to the problem would have been to set shopt -s nullglob.

Here's an example from the Pulsar CI refactoring:

            (
              shopt -s nullglob
              # Set swappiness to 1 for all cgroups and sub-groups
              for swappiness_file in /sys/fs/cgroup/memory/*/memory.swappiness /sys/fs/cgroup/memory/*/*/memory.swappiness; do
                echo 1 | sudo tee $swappiness_file > /dev/null
              done
            )

I'll be including this fix as part of the Pulsar CI refactoring that I have announced on the dev mailing list.