Loris Giovannini, Mauro Giacchini Epics Collaboration Meeting

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Presentation transcript:

Loris Giovannini, Mauro Giacchini Epics Collaboration Meeting Archiver Hypertable Engined (HyperArchiver) Loris Giovannini, Mauro Giacchini Epics Collaboration Meeting 03/06, 2010 L.Giovannini -- M.Giacchini

Target Make the EPICS Archiver embedded DB more reliable and safe especially in large application with a large number of PVs to store First Approach: re-write the Rtree and double- linked-list embedded DB structure Second approach: look for a complete replacement of the embedded DB with new one L.Giovannini -- M.Giacchini

Why not Beauty ? (Best Ever Archiver Utility) Beauty = Classical Archiver over Oracle DB Pros: SQL statements accept Professional Solution Cons: Not so fast Really expensive (licenses) L.Giovannini -- M.Giacchini

Why not MySQL ? Potential scalability concerns Designed for a single machine (not distributed) What it takes to make it scale Major engineering effort Solutions are usually ad hoc Solutions usually involve horizontal partitioning + replication Solutions involve expensive hardware L.Giovannini -- M.Giacchini

BigTable ? Proprietary DB used by Google over their proprietary Google File System High Performance Large amount of data Stable Reliable Distributed L.Giovannini -- M.Giacchini

HYPERTABLE…what is it ? Hypertable has been developed as an in-house software at Zvents Inc. In January 2009, Baidu, the leading Chinese language search engine, became a project sponsor. Rediff.com is one of the premier worldwide online providers of news, information, communication, entertainment and shopping service. Hypertable is licensed under the GNU General Public License Version 2. “Our goal is nothing less than that Hypertable become one of the world’s most massively parallel high performance database platforms.” Not RDB L.Giovannini -- M.Giacchini

Hadoop/Hypertable Solution Objective Handles applications with large datasets Fast fault detection and fail-over High throughput processing Centralized scheduling of tasks and execution of batch processes Can be deployed on low cost, commodity hardware Eliminates or reduces the need for expensive table joins L.Giovannini -- M.Giacchini

Machines used to the tests Machines and time up Insertion Time Retrieval Time (all pv parameters) Virtualbox virtual machine Debian Linux Stable x86 4 cores (shared among 3 VMs) 4GB RAM (1) 5.4k RPM SATA Disk $4k (to 4 Vbox) (1/2 h data acq SNS) 1 min 31 sec 1 777 600 sample 19.5K samples/sec 0.042 sec to extract 133K samples of 4 pv 3.17M samples/sec Debian Linux Stable AMD64 - 8 cores 64GB RAM (7) 10k RPM SAS Disks (RAID 5) $11k 1min 13.6 sec 1 777 600 samples 24K samples/sec 0.024 sec to extract 133K samples of 4 pv 5.54 Msamples/sec Debian Linux Stable AMD64 - 8 cores 64GB RAM (7) 10k RPM SAS Disks (RAID 5) $11k (7dy data acq SNS) 11.2 hours to insert 597M samples 14.8K samples/sec 0.031 sec to extract 133360 samples of 4 pv 4.3M samples/sec 19min 51 sec 597.273.600 all pv 500K samples/sec 64GB RAM (7) 10k RPM SAS Disks (RAID 5) $11k (30dy data acq SNS) 37.86 hours 2557M samples 18.7K samples/sec 0.030 sec to extract L.Giovannini -- M.Giacchini

Oracle Vs Hypertable Oracle insertion time : peak in write test (8Ksamples/sec) Hypertable insertion time: 1.777.600 per 1min 13 sec (24Ksamples/sec) Oracle retrieve time: 36.657 samples in 79.294 sec (~462 vals/sec) Hypertable retrieve time: 57624 samples in 0.36 sec ( 160K vals/sec) in half hour L.Giovannini -- M.Giacchini

Insertion Time Hypertable Hypertable into CSS THE OUR GOAL storing: 10000 channels per second retrieve: 1000 samples for up to 4 signal in less than 1 second Machines and time up Insertion Time Hypertable Insertion Time MySql Ubuntu 9.10 karmic Kola Intel Pentium M 740 1,73Ghz 2GB RAM 5,6K RPM sata Disk 8,45 sec 110200 sample 13K sample/sec 27,1 sec 110200 4K sample/sec L.Giovannini -- M.Giacchini

Retrieval outside CSS First Step: Develop a Java Program for only test the performances for retrieval without any elaboration of data to valuate the possibility to respect our goals using Thrift Java client API (Mandatory to interface with Hypertable) Results 1000 sample for 4 Pv: 1000 sample:22ms 1000 sample:15ms 1000 sample:15ms 56Ksample/sec 1000 sample:19ms L.Giovannini -- M.Giacchini

Retrieval L.Giovannini -- M.Giacchini L.Giovannini -- M.Giacchini

TIME Retrieval into CSS Second Step: Develope an Eclipse plug-in org.csstudio.archivereader.htrdb for the support of Hypertable like as org.csstudio.archivereader.rdb Working in Progress The extraction time into CSS is about 10 times worse: The reasons are under study, there are two probable causes: initial query latency of Thrift API when connect to Hypertable wrong classes design into CSS architecture L.Giovannini -- M.Giacchini

Acknowledgments More information Kay Kasemir (ORNL) Doug Judd (Hypertable Core Team) Bob Dalesio, Ralph Lange, Robert Petkus (BNL) More information www.lnl.infn.it/~epics/ L.Giovannini -- M.Giacchini