Comments for Marc Sturlese

Comment on Solr and Hadoop integration against scalability problems by Marc Sturlese

Marc Sturlese — Sat, 27 Feb 2010 18:59:32 +0000

Thankfully I have learned a bit more about Hadoop and Solr since I writed the post.
What you say makes sense. However, I think there is no need to have all the set of index in all nodes.
I imagine the scenario as:
An index shard is built in each datanode and is stored in HDFS. This datanode also contains a Solr instance in the local file system. The shard has to be copied to the local file system, this way Solr can serach into it.
Having a Solr instance in another server you could search across all the shards in the different datanodes using Solr distributed search.
What do you think?

Comment on Solr and Hadoop integration against scalability problems by Nick Adelman

Nick Adelman — Fri, 26 Feb 2010 03:59:01 +0000

I know this is an old post as of today, but I just wanted to add a comment regarding the tomcat instance. Reading the article, and having just done some POC work with Hadoop, I think that the tomcat instances are simply running on the same machines that are nodes in the Hadoop cluster. I don’t know the details, but I think this would allow each Solr instance to leverage data locality in the cluster by working with the index(s) that exist on that particular node. If replication was configured such that all nodes in the hadoop cluster received a copy of every index, then all of the solr instances would be leveraging the same set of indexes. However, I’m sure it is much more complicated than that, especially since it is not typical to have data replicated to all nodes in a hadoop cluster of any significant size.

Comment on JAD Java Decomplier by ivmai

ivmai — Tue, 15 Dec 2009 13:51:25 +0000

Unfortunately, Jad hasn’t been upgraded for a long time (the latest release is jad1.5.8g) while the java compilers continue to evolve… To achieve better results (including for Java 1.5+ classes) in decompilation, process the classes with JadRetro (jadretro.sf.net) tool before decompiling them by Jad.

Comment on Analyzing java heaps with jmap and jhat by andre parodi

andre parodi — Thu, 10 Dec 2009 11:46:16 +0000

if you are getting OOM when using jhat try eclipse mat.

Comment on Analyzing java heaps with jmap and jhat by Heap Dump and Analysis with VisualVM | PHP Hosts

Heap Dump and Analysis with VisualVM | PHP Hosts — Thu, 06 Aug 2009 07:08:52 +0000

[...] ⇒ Analyzing Java Heaps with jmap and jhat [...]

Comment on HD’s Load cycle count problem with Ubuntu fixed by panni

panni — Sat, 11 Jul 2009 02:29:02 +0000

Finally, i solved it on my dell studio 1555. First, gksudo gedit /boot/grub/menu.lst. And edit it by adding ‘noapic’ without quotes at the end of the boot loader entry for the os, after ‘ro quiet splash’. Then, run sudo update-grub. Then, edit /etc/laptop-mode.conf and change enable_laptop_mode_on_battery to 0. Then, edit all files of the form, /etc/acpi/*.d/90-hdparm.sh, and replace the line following if ["$State"="battery"] then;
hdparm -B 254 $dev
Else
hdparm -B 254 $dev. Thats all.. The noapic solves the dell studio ubuntu problem of not recognizing ac adapter, no changing brightness, closing lid lcd switch off, and elect key. Try it and let me know!

Comment on Performance measurement with JMeter 2.3.3 by Marc Sturlese

Marc Sturlese — Mon, 01 Jun 2009 14:58:18 +0000

Have never worked with it but Grinder could do the job.

Comment on Performance measurement with JMeter 2.3.3 by Girish

Girish — Mon, 01 Jun 2009 14:33:25 +0000

Can I ask you one question?
If I want to go for performance testing for an applet based application, which tool I should be using Ideally? The communication happens between applet and Server using HTTP protocol.

Comment on Performance measurement with JMeter 2.3.3 by Girish

Girish — Mon, 01 Jun 2009 14:19:28 +0000

thanks for info

Comment on Performance measurement with JMeter 2.3.3 by Marc Sturlese

Marc Sturlese — Mon, 01 Jun 2009 14:09:49 +0000

I have used it just for servlet performance tests so can't tell you so much about how it behaves with applets. As far as I know JMeter can not process applets