had to reduce of concurrent aarch64 compile jobs to 2 since there had been OOM conditions.

For instance

https://ci.bigtop.apache.org/job/Bigtop-trunk-packages/COMPONENTS=hadoop,OS=debian-9-aarch64/230/console <https://ci.bigtop.apache.org/job/Bigtop-trunk-packages/COMPONENTS=hadoop,OS=debian-9-aarch64/230/console>

[�[1;34mINFO�[m] Generating "JavaDocs" report             --- maven-javadoc-plugin:2.9.1:aggregate
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 70778880 bytes for committing reserved memory.
# An error report file with more information is saved as:
# /ws/output/hadoop/hadoop-2.8.1/target/site/hadoop-project/api/hs_err_pid7985.log
[�[1;34mINFO�[m] �[1m------------------------------------------------------------------------�[m

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