BTW - did you have any data that would have created a sequentially increasing index?
For instance, a "Created At" timestamp? This sort of thing in a high write environment can cause issues: though tablets are essentially sharded, it means sequential index writes at a high speed, causing tablets to become "hot" and slow your overall throughput. -- Ikai Lan Developer Programs Engineer, Google App Engine Blogger: http://googleappengine.blogspot.com Reddit: http://www.reddit.com/r/appengine Twitter: http://twitter.com/app_engine On Wed, Nov 24, 2010 at 10:26 AM, Ikai Lan (Google) < ikai.l+gro...@google.com <ikai.l%2bgro...@google.com>> wrote: > Mind blowing. Awesome! > > > -- > Ikai Lan > Developer Programs Engineer, Google App Engine > Blogger: http://googleappengine.blogspot.com > Reddit: http://www.reddit.com/r/appengine > Twitter: http://twitter.com/app_engine > > > > On Wed, Nov 24, 2010 at 5:54 AM, Cyrille Vincey <crll...@gmail.com> wrote: > >> It works, and the performance is breathtaking : >> 8.6 million entities (4.3 lines x 2 entities per line) created in 1.5h, >> using 100 shards… >> Compared to my previous non-blob-based mapper job, CPU cost remains a >> little high (190 CPU hours), but I can't complain. >> Thank you guys. >> >> From: "Ikai Lan (Google)" <ikai.l+gro...@google.com> >> Reply-To: <google-appengine-java@googlegroups.com> >> Date: Wed, 17 Nov 2010 16:06:07 -0800 >> >> To: <google-appengine-java@googlegroups.com> >> Subject: Re: [appengine-java] Mapper & Blobstore bytes read limit >> >> The bug has been fixed. Check out the latest code from the >> appengine-mapreduce project. >> >> Note that the ratio between blobstore bytes read and blob size is not 1:1. >> In my tests they were closer to 10:1. This is expected behavior for the time >> being. We're working on more options so users can better tune the behavior. >> >> -- >> Ikai Lan >> Developer Programs Engineer, Google App Engine >> Blogger: http://googleappengine.blogspot.com >> Reddit: http://www.reddit.com/r/appengine >> Twitter: http://twitter.com/app_engine >> >> >> >> On Wed, Nov 17, 2010 at 2:19 AM, Cyrille Vincey <crll...@gmail.com>wrote: >> >>> VERY good news. >>> Can't wait. Thanks. >>> >>> From: "Ikai Lan (Google)" <ikai.l+gro...@google.com> >>> Reply-To: <google-appengine-java@googlegroups.com> >>> Date: Tue, 16 Nov 2010 12:07:59 -0800 >>> >>> To: <google-appengine-java@googlegroups.com> >>> Subject: Re: [appengine-java] Mapper & Blobstore bytes read limit >>> >>> We discovered a bug. We're not reading in the entire blob, but we are >>> reading in far too much data. >>> >>> Fred has a fix waiting in the rafters. I'll post again when it's been >>> pushed. >>> >>> -- >>> Ikai Lan >>> Developer Programs Engineer, Google App Engine >>> Blogger: http://googleappengine.blogspot.com >>> Reddit: http://www.reddit.com/r/appengine >>> Twitter: http://twitter.com/app_engine >>> >>> >>> >>> On Thu, Nov 4, 2010 at 2:36 AM, Cyrille Vincey <crll...@gmail.com>wrote: >>> >>>> Not a lot of interesting stuff to say : >>>> 1. My code is quite as simple as your sample code: the only real >>>> difference is that I create 2 parent/child entities in a row for one given >>>> csv line entry. >>>> 2. My csv file contains 4.3 million lines. >>>> 2. I launched the mapper job with 10 shards. >>>> 3. "worker-attempt-XXX" tasks had 20 retries each in average. >>>> 4. The blobstore bytes read quota (100 Go) got reached within the first >>>> 3 hours. >>>> 5. Est. 10% of the entities where actually created after 24h (with my >>>> previous non-blob-based mapper job, those 4.3 million entities where >>>> created >>>> within 1 day) >>>> 6. Log does not reveal anything interesting. >>>> >>>> I am currently running a new test with a 500,000 lines csv file (20 Mb >>>> file). >>>> Performance looks better. To me, blob file size may have an influence on >>>> the mapper performance. >>>> >>>> If you need more details, let me know. >>>> >>>> From: "Ikai Lan (Google)" <ikai.l+gro...@google.com> >>>> Reply-To: <google-appengine-java@googlegroups.com> >>>> Date: Wed, 3 Nov 2010 12:22:10 -0700 >>>> To: <google-appengine-java@googlegroups.com> >>>> Subject: Re: [appengine-java] Mapper & Blobstore bytes read limit >>>> >>>> This behavior doesn't seem right. No, the entire blob should not be >>>> getting read. We'll look into this. >>>> >>>> Do you have any more details? Could tasks be getting retried? >>>> >>>> -- >>>> Ikai Lan >>>> Developer Programs Engineer, Google App Engine >>>> Blogger: http://googleappengine.blogspot.com >>>> Reddit: http://www.reddit.com/r/appengine >>>> Twitter: http://twitter.com/app_engine >>>> >>>> >>>> >>>> On Tue, Nov 2, 2010 at 9:42 AM, Cyrille Vincey <crll...@gmail.com>wrote: >>>> >>>>> I've been testing Ikai's bulkload mapper (see url below) with a pretty >>>>> big csv file (200 Mb). >>>>> It works great, and I encourage most of you to consider implementing >>>>> this for entity uploads. >>>>> >>>>> Yet, I do face one last issue with an unexpected quota : blobstore >>>>> bytes read. >>>>> This quota cannot be tuned via the billing settings, and it's not clear >>>>> whether it limits the speed of my process or not when it's reached. >>>>> >>>>> >>>>> See ? Yep, it's a lot of bytes read… >>>>> Could someone confirm that the blob csv file is *NOT* fully fetched >>>>> each time the mapper iterates on a new line ? >>>>> >>>>> (ikai's post) >>>>> http://ikaisays.com/2010/08/11/using-the-app-engine-mapper-for-bulk-data-import >>>>> / >>>>> >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "Google App Engine for Java" group. >>>>> To post to this group, send email to >>>>> google-appengine-j...@googlegroups.com. >>>>> To unsubscribe from this group, send email to >>>>> google-appengine-java+unsubscr...@googlegroups.com<google-appengine-java%2bunsubscr...@googlegroups.com> >>>>> . >>>>> For more options, visit this group at >>>>> http://groups.google.com/group/google-appengine-java?hl=en. >>>>> >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Google App Engine for Java" group. >>>> To post to this group, send email to >>>> google-appengine-j...@googlegroups.com. >>>> To unsubscribe from this group, send email to >>>> google-appengine-java+unsubscr...@googlegroups.com. >>>> For more options, visit this group at >>>> http://groups.google.com/group/google-appengine-java?hl=en. >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Google App Engine for Java" group. >>>> To post to this group, send email to >>>> google-appengine-j...@googlegroups.com. >>>> To unsubscribe from this group, send email to >>>> google-appengine-java+unsubscr...@googlegroups.com<google-appengine-java%2bunsubscr...@googlegroups.com> >>>> . >>>> For more options, visit this group at >>>> http://groups.google.com/group/google-appengine-java?hl=en. >>>> >>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "Google App Engine for Java" group. >>> To post to this group, send email to >>> google-appengine-j...@googlegroups.com. >>> To unsubscribe from this group, send email to >>> google-appengine-java+unsubscr...@googlegroups.com. >>> For more options, visit this group at >>> http://groups.google.com/group/google-appengine-java?hl=en. >>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "Google App Engine for Java" group. >>> To post to this group, send email to >>> google-appengine-j...@googlegroups.com. >>> To unsubscribe from this group, send email to >>> google-appengine-java+unsubscr...@googlegroups.com<google-appengine-java%2bunsubscr...@googlegroups.com> >>> . >>> For more options, visit this group at >>> http://groups.google.com/group/google-appengine-java?hl=en. >>> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Google App Engine for Java" group. >> To post to this group, send email to >> google-appengine-j...@googlegroups.com. >> To unsubscribe from this group, send email to >> google-appengine-java+unsubscr...@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/google-appengine-java?hl=en. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Google App Engine for Java" group. >> To post to this group, send email to >> google-appengine-j...@googlegroups.com. >> To unsubscribe from this group, send email to >> google-appengine-java+unsubscr...@googlegroups.com<google-appengine-java%2bunsubscr...@googlegroups.com> >> . >> For more options, visit this group at >> http://groups.google.com/group/google-appengine-java?hl=en. >> > > -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
<<Capture d¹écran 2010-11-02 à 17 .17.25.png>>
