http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/tip/src/share/classes/sun/misc/VM.java#l184
// The initial value of this field is arbitrary; during JRE
initialization
// it will be reset to the value specified on the command line, if any,
// otherwise to Runtime.getRuntime().maxMemory().
which goes all the way down to memory/heap.cpp to whatever was left to the
reserved memory depending on the flags and the platform used as Vladimir
says.
Also, depending on which distribution and features are used there are
specific guidelines about setting that parameter so mileage might vary.
thanks,
esteban.
--
Cloudera, Inc.
On Tue, Oct 10, 2017 at 1:35 PM, Vladimir Rodionov <vladrodio...@gmail.com>
wrote:
> >> The default value is zero, which means the maximum direct memory is
> unbounded.
>
> That is not correct. If you do not specify MaxDirectMemorySize, default is
> platform specific
>
> The link above is for JRockit JVM I presume?
>
> On Tue, Oct 10, 2017 at 11:19 AM, Esteban Gutierrez <este...@cloudera.com>
> wrote:
>
> > I don't think is truly unbounded, IIRC it s limited to the maximum
> > allocated heap.
> >
> > thanks,
> > esteban.
> >
> > --
> > Cloudera, Inc.
> >
> >
> > On Tue, Oct 10, 2017 at 1:11 PM, Ted Yu <yuzhih...@gmail.com> wrote:
> >
> > > From https://docs.oracle.com/cd/E15289_01/doc.40/e15062/optionxx.htm :
> > >
> > > java -XX:MaxDirectMemorySize=2g myApp
> > >
> > > Default Value
> > >
> > > The default value is zero, which means the maximum direct memory is
> > > unbounded.
> > >
> > > On Tue, Oct 10, 2017 at 11:04 AM, Vladimir Rodionov <
> > > vladrodio...@gmail.com>
> > > wrote:
> > >
> > > > >> XXMaxDirectMemorySize is set to the default 0, which means
> unlimited
> > > as
> > > > far
> > > > >> as I can tell.
> > > >
> > > > Not sure if this is true. The only conforming that link I found was
> for
> > > > JRockit JVM.
> > > >
> > > > On Mon, Oct 9, 2017 at 11:29 PM, Daniel Jeliński <
> djelins...@gmail.com
> > >
> > > > wrote:
> > > >
> > > > > Vladimir,
> > > > > XXMaxDirectMemorySize is set to the default 0, which means
> unlimited
> > as
> > > > far
> > > > > as I can tell.
> > > > > Thanks,
> > > > > Daniel
> > > > >
> > > > > 2017-10-09 19:30 GMT+02:00 Vladimir Rodionov <
> vladrodio...@gmail.com
> > >:
> > > > >
> > > > > > Have you try to increase direct memory size for server process?
> > > > > > -XXMaxDirectMemorySize=?
> > > > > >
> > > > > > On Mon, Oct 9, 2017 at 2:12 AM, Daniel Jeliński <
> > > djelins...@gmail.com>
> > > > > > wrote:
> > > > > >
> > > > > > > Hello,
> > > > > > > I'm running an application doing a lot of Puts (size anywhere
> > > > between 0
> > > > > > and
> > > > > > > 10MB, one cell at a time); occasionally I'm getting an error
> like
> > > the
> > > > > > > below:
> > > > > > > 2017-10-09 04:29:29,811 WARN [AsyncProcess] - #13368,
> > > > > > > table=researchplatform:repo_stripe, attempt=1/1 failed=1ops,
> > last
> > > > > > > exception: java.io.IOException: com.google.protobuf.
> > > > ServiceException:
> > > > > > > java.lang.OutOfMemoryError: Direct buffer memory on
> > > > > > > c169dzv.int.westgroup.com,60020,1506476748534, tracking
> started
> > > Mon
> > > > > Oct
> > > > > > 09
> > > > > > > 04:29:29 EDT 2017; not retrying 1 - final failure
> > > > > > >
> > > > > > > After that the connection to RegionServer becomes unusable.
> Every
> > > > > > > subsequent attempt to execute Put on that connection results in
> > > > > > > CallTimeoutException. I only found the OutOfMemory by reducing
> > the
> > > > > number
> > > > > > > of tries to 1.
> > > > > > >
> > > > > > > The host running HBase appears to have at least a few GB of
> free
> > > > memory
> > > > > > > available. Server logs do not mention anything about this
> error.
> > > > > Cluster
> > > > > > is
> > > > > > > running HBase 1.2.0-cdh5.10.2.
> > > > > > >
> > > > > > > Is this a known problem? Are there workarounds available?
> > > > > > > Thanks,
> > > > > > > Daniel
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>
