Sorry, now I think the above comment is wrong. Please ignore.
In hadoop-common, hadoop-hdfs, and hadoop-hdfs-rbf, the unit tests are
executed in parallel. I'd like to reduce the number of tests running
at the same time to avoid OOM. Filed
https://issues.apache.org/jira/browse/HDFS-15731

On Thu, Dec 17, 2020 at 4:17 PM Akira Ajisaka <aajis...@apache.org> wrote:
>
> 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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