Changes between Initial Version and Version 1 of developers-meeting-20141119


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Timestamp:
11/19/14 16:44:22 (6 years ago)
Author:
karsten
Comment:

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  • developers-meeting-20141119

    v1 v1  
     1[[TOC(depth=0)]] 
     2 
     3[part of a [wiki:developers-meetings series of meetings]] 
     4 
     5= Participants = 
     6Christian, Al, Paul, Tigran, Karsten 
     7 
     8= Agenda = 
     9 
     10[see box on the right-hand side] 
     11 
     12= Postcards = 
     13 
     14Up to two minutes (uninterrupted) per person where they can answer two questions: 
     15 *  What I did last week (since the last meeting), 
     16 *  What I plan to do in the next week. 
     17 
     18No questions until we get through everyone :) 
     19 
     20Karsten:  
     21    Preparing presentation, Reviews, Tickets 
     22 
     23Christian:  
     24    Cleaning up and fixing tickets from 2014 toill now 
     25 
     26Tigran: 
     27    - Loking for NFS problem with cloud, have a couple of ideas: there are a lot of r/w operations and mixed in  
     28      which causes error messages 
     29    - Investigated running dCache on ARM A7 CPUs in HDD. Installed everything, but performance so far looks poor. 
     30      will talk to them again. 
     31    - CERN Workshop on Clouds and more 
     32    - Cleaned up patches and patch for setting atime 
     33  
     34Gerd: 
     35    - Continued investitgation of Alice transfers 
     36      - There are some issues due to missing synchronisation between staging files at CERN and NDGF 
     37    - created some patches concerning errors 
     38 
     39Paul:  
     40    - Cloud workshop at CERN with about 100 people. 
     41    - Organizing more meetings 
     42    - fixing things 
     43 
     44Dmitry: 
     45    - Preparing for moving  
     46 
     47Al: 
     48    - Dealed with some Wicket problems 
     49      - One needs still some cleaning up 
     50      -> suggest to upgrade to Wicket 6 
     51      - Found another issue with XML datastore. There is a patch waiting to be published. 
     52      - Worked on restructuring a patch from some weeks ago, close to finishing. 
     53      - Answered some tickets (RRD) 
     54 
     55= Special topics = 
     56 
     57== LRU == 
     58https://srm.fnal.gov/twiki/bin/view/DcacheCorner/LruPlot 
     59based on sweeper get lru. 
     60 
     61It looks like the sweeper removed files based on file age rather than last access time. 
     62 
     63Looks like the confusion was caused by using "-f" option. 
     64 
     65-> Columns were confused and columns misunderstood. 
     66 
     67The value is used to determine how long a file is on pool before it gets flushed to tape. 
     68 
     69== Paul and Tigran @ CERN == 
     70 
     712 days workshop with 100 people. Talks are online + Videos.  
     72 
     73Talked to OwnCloud Staff regarding our DESY instance/use-case. 
     74 - redirection 
     75 - ACL synchronisation 
     76 
     77   Will organize meeting with them at DESY 
     78 
     79- Other teams presented their cloud solution.  
     80- IBM presented OwnCloud on gpfs. 
     81  showed that  
     82 
     83- Talk about JIT data analysis 
     84- Sync and Share, tester QuickCheck 
     85 
     86- CERN also tries to have a Cloud solution based on EOS, working also with other protocols 
     87  With a little more clever way of finding changed files 
     88 
     89Suggest to watch Keynote Speech about how to find problems in things that are hard to test!   
     90 
     91-> Hopefully better contact with OwnCloud people and meeting 
     92 
     93Progress with new features... 
     94 
     95Tigran:  
     96   File attribute update path: will change chimera, access latency to improve performance 
     97 
     98Gerd: 
     99   Did we consider or check performance for conversing keys to INT64 instead of STRING. 
     100   -> Can try, but this might confuse users more (Tigran) 
     101 
     102= Issues from [FIXME: Add link to yesterday's Tier-1 meeting] = 
     103Paul: 
     104Thursday:  
     105   Fermi:  
     106      Mountpoint hanging, should they use 4.1 or 4.0? dccp on NFS4.1 mount in 2.2 may cause mount to hang. 
     107      They needs mkdir, so 3 would be good enough. 
     108      -> Advised them to use 4.0 
     109 
     110      ... 
     111 
     112= Plans for patch-releases = 
     113 
     114Should we make a new patch release? 
     115 
     116Releases on Tuesday.  
     117 
     118= Outstanding RT Tickets = 
     119 
     120= Review of RB requests = 
     121 
     122Please have a look at 7499 
     123 
     124= New, noteworthy and other business = 
     125 
     126= DTNM = 
     127 
     128Proposed: same time, next week.