Yep, give it a try.
https://cr.openjdk.java.net/~iris/se/11/latestSpec/api/java.base/java/net/doc-files/net-properties.html
I don't have personal experience with these settings.
Andor
On Wed, 2020-01-22 at 10:37 -0800, rammohan ganapavarapu wrote:
> Hi Andor,
>
> On OS side the hostname resolves to new IP, so it could be JVM is
> the one
> caching. Any setting son jvm to invalidate cache? In some other posts
> i did
> see some one recommending these but not sure it it works.
>
> -Dnetworkaddress.cache.ttl=0
>
> -Dnetworkaddress.cache.negative.ttl=0
>
> Ram
>
> On Wed, Jan 22, 2020 at 2:03 AM Andor Molnar <an...@apache.org>
> wrote:
>
> > Hi Ram,
> >
> > As far as I can see from the code, ZooKeeper uses the standard Java
> > calls
> > getByName() and getAllByName() every time it’s trying to connect to
> > a
> > server.
> >
> > ————————
> > // zookeeper.ipReachableTimeout is not defined
> > if (ipReachableTimeout <= 0) {
> > address = InetAddress.getByName(this.hostname);
> > } else {
> > address = getReachableAddress(this.hostname,
> > ipReachableTimeout);
> > }
> > ————————
> >
> > ZK doesn’t (and definitely should not) cache IP addresses. It’s
> > either the
> > cache of JVM or your DNS server.
> >
> > Dynamic reconfig is available in 3.5.x versions which are already
> > stable
> > now and I think with that you don’t need to reuse existing
> > hostnames.
> > Instead use reconfig commands to properly remove old nodes and add
> > new
> > ones. Sounds like more cumbersome, but maybe more reliable.
> >
> > Andor
> >
> >
> >
> >
> > > On 2020. Jan 21., at 23:14, rammohan ganapavarapu <
> > rammohanga...@gmail.com> wrote:
> > > But still happening for me, is there any config on zookeeper side
> > > to make
> > > this fix to work?
> > >
> > > Ram
> > >
> > > On Tue, Jan 21, 2020 at 2:12 PM Michael Han <h...@apache.org>
> > > wrote:
> > >
> > > > Could be ZOOKEEPER-1506, though this should be fixed already in
> > > > 3.4.14.
> > > >
> > > > On Tue, Jan 21, 2020 at 2:01 PM rammohan ganapavarapu <
> > > > rammohanga...@gmail.com> wrote:
> > > >
> > > > > Hi Enrico,
> > > > >
> > > > > I see same with both 3.4.5 and 3.4.14
> > > > >
> > > > > Ram
> > > > >
> > > > > On Tue, Jan 21, 2020 at 1:53 PM Enrico Olivelli <
> > > > > eolive...@gmail.com>
> > > > > wrote:
> > > > >
> > > > > > Hi,
> > > > > > Which version of ZK are you using?
> > > > > > Enrico
> > > > > >
> > > > > >
> > > > > > Il mar 21 gen 2020, 22:51 rammohan ganapavarapu <
> > > > rammohanga...@gmail.com
> > > > > > ha scritto:
> > > > > >
> > > > > > > Hi,
> > > > > > >
> > > > > > > Does zookeeper cache the host IP? if so how long does it
> > > > > > > cache? I
> > > > have
> > > > > a
> > > > > > > zk cluster in autoscaling groups and when a new node
> > > > > > > comes up, other
> > > > > > nodes
> > > > > > > still resolving to old IP. Is there any setting to
> > > > > > > invalidate dns
> > > > cache
> > > > > > for
> > > > > > > zookeeper? or is it jvm dns cache? until other nodes
> > > > > > > resolves to new
> > > > > IP,
> > > > > > > this node not able to join the cluster.
> > > > > > >
> > > > > > > Thanks,
> > > > > > > Ram
> > > > > > >
