Home | About | Sematext search-lucene.com search-hadoop.com
 Search Hadoop and all its subprojects:

Switch to Threaded View
Zookeeper >> mail # user >> Zookeeper does not clean up deleted nodes


Copy link to this message
-
Re: Zookeeper does not clean up deleted nodes
I created a new issue https://issues.apache.org/jira/browse/ZOOKEEPER-1687
2013/4/8 Benjamin Reed <[EMAIL PROTECTED]>

> it would be very simple to make that 500 configurable. you should propose a
> change.
>
>
> On Mon, Apr 8, 2013 at 9:40 AM, Mathias Hodler <[EMAIL PROTECTED]
> >wrote:
>
> > Thanks, this could be the reason. I only used a single zookeeper server,
> so
> > it should act as a leader.
> >
> > So if I need to store larger files (about 1MB) the only option is to
> > increase the heap space? I know that zookeeper is designed for small
> files,
> > but I'm using zookeeper with solr and solr stores all the index
> > configuration with large dictionaries in zookeeper.
> >
> >
> > 2013/4/8 Benjamin Reed <[EMAIL PROTECTED]>
> >
> > > are you looking at the leader or the follower? the leader keeps the
> last
> > > few transactions in memory to speed up syncing with new followers. that
> > > might be what you are seeing.
> > >
> > >
> > > On Mon, Apr 8, 2013 at 3:32 AM, Mathias Hodler <
> [EMAIL PROTECTED]
> > > >wrote:
> > >
> > > > Hi,
> > > >
> > > > I made some tests and it seems like zookeeper doesn't clean up the
> last
> > > 500
> > > > deleted nodes.
> > > >
> > > > In my test I created nodes and deleted each node after it was
> created.
> > I
> > > > repeated this step 1000 times and then triggered a full gc. These are
> > the
> > > > results
> > > >
> > > > Creating 1000 Nodes and deleting 1000 Nodes and each node has...
> > > > ...1000kb data = 529MB heap used after FullGC
> > > > ...500kb data = 281MB heap used after FullGC
> > > > ...256kb data = 140MB heap used after FullGC
> > > > ...128kb data =  68MB heap used after FullGC
> > > >
> > > > If I'm creating 1000 nodes with each 1000kb data and then deleting
> the
> > > > nodes and after that creating 1000 nodes with 128kb data and deleting
> > the
> > > > nodes again, 68MB heap space is used.
> > > >
> > > > So it seems Zookeeper caches / doesn't clean up the last 500 deleted
> > > nodes.
> > > >
> > > > Is this a bug or are there configuration parameter to change that
> > > > behaviour?
> > > >
> > >
> >
>