In most cases, the OOM occurs when closing MiniDFSCluster.
Added a detailed comment in
https://issues.apache.org/jira/browse/HDFS-13579 and created a PR:
https://github.com/apache/hadoop/pull/2555

-Akira

On Fri, Dec 4, 2020 at 12:43 AM Ahmed Hussein <a...@ahussein.me> wrote:
>
> I remember this error was there for more than 6 months. It significantly
> slows down the progress of collaboration.
> Then, eventually, the community will develop another habit of ignoring the
> prebuilds (out of despair).
>
> I am willing to help to get this fixed.
> Anyone knows who owns and has experience with Yetus environment?
>
> On Wed, Dec 2, 2020 at 4:43 PM Jim Brennan <james.bren...@verizonmedia.com>
> wrote:
>
> > This is still happening.
> > Latest build:
> > https://ci-hadoop.apache.org/job/hadoop-qbt-trunk-java8-linux-x86_64/343/#showFailuresLink
> >
> > Looks like we are running out of threads in the containers where the unit
> > tests run.  Anyone know where this is setup?
> >
> > On Wed, Oct 21, 2020 at 5:51 PM Ahmed Hussein <a...@ahussein.me> wrote:
> >
> >> Hey folks,
> >>
> >> Yetus has been failing miserably over the last couple of days.
> >> In the Lastest qbt-report
> >> <
> >> https://urldefense.proofpoint.com/v2/url?u=https-3A__ci-2Dhadoop.apache.org_job_hadoop-2Dqbt-2Dtrunk-2Djava8-2Dlinux-2Dx86-5F64_301_artifact_out_patch-2Dunit-2Dhadoop-2Dhdfs-2Dproject-5Fhadoop-2Dhdfs.txt&d=DwIBaQ&c=sWW_bEwW_mLyN3Kx2v57Q8e-CRbmiT9yOhqES_g_wVY&r=7Imi06B91L3gbxmt5ChzH4cwlA2_f2tmXh3OXmV9MLw&m=HChJ3ymJ0kOlFyiTBsyRZLs9qcTOQD864ZFb8g7y2CA&s=N-PB427UiouJCuX_U3UbUXvIh2HQTt7VdM2Bs_4XILI&e=
> >> >,
> >> hundreds of Junits fail after java failed to acquire resources
> >> to create new threads.
> >>
> >> [ERROR]
> >> >
> >> testRecoverAllDataBlocks1(org.apache.hadoop.hdfs.TestReconstructStripedFileWithRandomECPolicy)
> >> >  Time elapsed: 8.509 s  <<< ERROR!
> >> > java.lang.OutOfMemoryError: unable to create new native thread
> >>
> >>
> >> Any thoughts on what could trigger that in the last few days? Do we need
> >> more resources for the image?
> >>
> >> --
> >> Best Regards,
> >>
> >> *Ahmed Hussein, PhD*
> >>
> >
>
> --
> Best Regards,
>
> *Ahmed Hussein, PhD*

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