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Replication in the harp file system

Barbara Liskov, Sanjay Ghemawat, Robert Gruber, Paul Johnson, Liuba Shrira
1991 ACM SIGOPS Operating Systems Review  
Harp is a replicated Unix file system before replying to the client. The system masks failures by accessible via the VFS interface.  ...  Harp file system.  ...  Ultimately, we plan to move Harp onto DECstation 5000's The authors gratefully acknowledge the helpful comconnected by a 100 megabit FDDI network and put it into ments of Dorothy Curtis, David Gifford,  ... 
doi:10.1145/121133.121169 fatcat:gjia5bci75dyvcvth76vdgu5b4

Replication in the harp file system

Barbara Liskov, Sanjay Ghemawat, Robert Gruber, Paul Johnson, Liuba Shrira
1991 Proceedings of the thirteenth ACM symposium on Operating systems principles - SOSP '91  
Harp is a replicated Unix file system before replying to the client. The system masks failures by accessible via the VFS interface.  ...  Harp file system.  ...  Ultimately, we plan to move Harp onto DECstation 5000's The authors gratefully acknowledge the helpful comconnected by a 100 megabit FDDI network and put it into ments of Dorothy Curtis, David Gifford,  ... 
doi:10.1145/121132.121169 dblp:conf/sosp/LiskovGGJSW91 fatcat:4elkue77bbd4jluufxue3tonz4

From Viewstamped Replication to Byzantine Fault Tolerance [chapter]

Barbara Liskov
2010 Lecture Notes in Computer Science  
The first is Viewstamped Replication, which was developed in the 1980's and allows a group of replicas to continue to provide service in spite of a certain number of crashes among them.  ...  Both protocols allow users to execute general operations (thus they provide state machine replication); both were developed in the Programming Methodology group at MIT.  ...  A later project on the Harp file system applied VR to building a highly available file system. A paper on Harp appeared in SOSP in 1991 [18] .  ... 
doi:10.1007/978-3-642-11294-2_7 fatcat:xohcebtmrjdkdl4bqltfnd3oxu

Achieving strong consistency in a distributed file system

P. Triantafillou, C. Neilson
1997 IEEE Transactions on Software Engineering  
Distributed file systems nowadays need to provide for fault tolerance. This is typically achieved with the replication of files.  ...  Existing approaches to the construction of replicated file systems sacrifice strong semantics (i.e., the guarantees the systems make to running computations when failures occur and/or files are accessed  ...  Satyanarayanan's help in obtaining detailed file traces, from which our test data was derived, is also greatly appreciated.  ... 
doi:10.1109/32.581328 fatcat:a3fn6t7bizgm5aot3774vpumja

Distributed Query Processing for Structured and Bibliographic Databases

Ee-Peng Lim, Ying Lu
1997 Database Systems for Advanced Applications '97  
By adopting the well-accepted 239.50 standard protocol to access bibliographic databases in different legacy library systems, we have developed an extended SQL model, known as Harp-SQL, to support integrated  ...  Using Harp-SQL, one can not only query bibliographic databases in an SQL manner, but also perform join(s) between SQL and bibliographic databases.  ...  Acknowledgements We thank Zhiliang Wang from the Information Technology Institute (ITI), National Computer Board for helpful discussions on the implementation issues.  ... 
doi:10.1142/9789812819536_0046 fatcat:a6f2y5g7mfgnbk5ycjb4chpuse

HARP: Practically and Effectively Identifying Uncorrectable Errors in Memory Chips That Use On-Die Error-Correcting Codes [article]

Minesh Patel, Geraldo F. Oliveira, Onur Mutlu
2021 arXiv   pre-print
To address the three challenges, we introduce Hybrid Active-Reactive Profiling (HARP), a new error profiling algorithm that rapidly achieves full coverage of at-risk bits in memory chips that use on-die  ...  We show that HARP outperforms the best baseline algorithm (e.g., by 3.7x for a raw per-bit error probability of 0.75).  ...  ACKNOWLEDGMENTS We thank the anonymous reviewers of MICRO 2021 for their feedback and the SAFARI Research Group members for their feedback and the stimulating intellectual environment they provide.  ... 
arXiv:2109.12697v3 fatcat:o4maxsouyrgfji66nn4oy73ydi

Hierarchical Replication Control in a Global File System

Jiaying Zhang, Peter Honeyman
2007 Seventh IEEE International Symposium on Cluster Computing and the Grid (CCGrid '07)  
We develop a consistent mutable replication extension for NFSv4 tuned to meet the rigorous demands of largescale data sharing in global collaborations.  ...  The system uses a hierarchical replication control protocol that dynamically elects a primary server at various granularities.  ...  Echo [13] and Harp [14] are file systems that use the primary copy scheme to support mutable replication.  ... 
doi:10.1109/ccgrid.2007.57 dblp:conf/ccgrid/ZhangH07 fatcat:w3oml3vt7vevbdq3h7jc3lvo3q

Scalability of Replicated Metadata Services in Distributed File Systems [chapter]

Dimokritos Stamatakis, Nikos Tsikoudis, Ourania Smyrnaki, Kostas Magoutis
2012 Lecture Notes in Computer Science  
One such area is the management of metadata in distributed file systems.  ...  file system metadata services.  ...  We thankfully acknowledge the support of the European ICT-FP7 program through the CUMULONIMBO (STREP 257993) project, and of Amazon Web Services through an Education Grant.  ... 
doi:10.1007/978-3-642-30823-9_3 fatcat:ivakbjqnwbgjhkcoloom7atu2y

Harp: Collective Communication on Hadoop

Bingjing Zhang, Yang Ruan, Judy Qiu
2015 2015 IEEE International Conference on Cloud Engineering  
The inclusion of collective communication abstraction and Map-Collective model means Harp is neither a replication of MPI nor an attempt to transplant MPI into the Hadoop system [16], as we will elaborate  ...  The word "harp" symbolizes how parallel processes cooperate through collective communication for efficient data processing, just as strings in harps can make concordant sound (see Fig. 2 ).  ...  ACKNOWLEDGEMENT We appreciate the system support offered by Big Red II. We gratefully acknowledge support from National Science Foundation grant OCI-1149432.  ... 
doi:10.1109/ic2e.2015.35 dblp:conf/ic2e/ZhangRQ15 fatcat:wqkvtszvbbg3nnh27eks7h3plq


Jason A. Williams, Michael J. O'Farrell, Brett R. Riddle
2006 Journal of Mammalogy  
The remaining 6 species spent substantially more time in at least 1 of the 4 habitats.  ...  Fifteen species of bats were detected acoustically, 13 of which were captured using harp traps or mist nets. Five species were not detected frequently enough to be included in statistical analyses.  ...  The United States Fish and Wildlife Service provided access to Moapa Valley National Wildlife Refuge as well as facilitated the availability of researcher housing.  ... 
doi:10.1644/06-mamm-a-085r2.1 fatcat:x5vhgqkmpjfsfbq6josx5ekiem

The control of carrier frequency in cricket calls: a refutation of the subalar-tegminal resonance/auditory feedback model

K N Prestwich, K M Lenihan, D M Martin
2000 Journal of Experimental Biology  
Calculations show that the harp is 3.9-1.8 times more massive than the air that moves en masse with the vibrating harps.  ...  Replacing air with heliox-air lowers the mass of the vibrating system sufficiently to account for the f(C) shifts. These results re-affirm the 'clockwork cricket' (escapement) hypothesis.  ...  of the Physics Department.  ... 
pmid:10637187 fatcat:3pxwcmgw2bhbdgwagkdwrzpd4u

Structure and mechanistic features of the prokaryotic minimal RNase P

Rebecca Feyh, Nadine Bianca Waeber, Simone Prinz, Pietro Ivan Giammarinaro, Gert Bange, Georg Hochberg, Roland Karl Hartmann, Florian Altegoer
2021 eLife  
Our analysis thus delivers the structural and mechanistic basis for pre-tRNA processing by the prokaryotic HARP system.  ...  Homologs of Aquifex RNase P (HARPs) are also expressed in some other bacteria and many archaea, where they coexist with RNA-based RNase P and do not represent the main RNase P activity.  ...  Acknowledgements 445 We thank the Cryo-EM facility at the MPI for Biophysics for generous support.  ... 
doi:10.7554/elife.70160 pmid:34180399 pmcid:PMC8266387 fatcat:ft5uisi6qzf4fii3tbe2xleplq

A replicated file system for Grid computing

Jiaying Zhang, Peter Honeyman
2008 Concurrency and Computation  
To meet the rigorous demands of large-scale data sharing in global collaborations, we present a replication scheme for NFSv4 that supports mutable replication without sacrificing strong consistency guarantees  ...  With the introduction of a hierarchical replication control protocol, the overhead of replication is negligible even when applications mostly write and replication servers are widely distributed.  ...  ACKNOWLEDGEMENTS We gratefully acknowledge the support of NSF Middleware Initiative Grant No. SCI-0438298 and Network Appliance, Inc.  ... 
doi:10.1002/cpe.1286 fatcat:shwbuglgevfmteh6cpdf4pgbai

A virtual shared metadata storage for HDFS

Jiang Zhou, Yong Chen, Xiaoyan Gu, Weiping Wang, Dan Meng
2015 2015 IEEE International Conference on Networking, Architecture and Storage (NAS)  
A distributed file system HDFS is implemented to provide high-throughput access to datasets. HDFS can achieve high performance metadata service but has two disadvantages.  ...  Two strategies, a journal synchronization based on the 2PC protocol and a fine-grained image replication, are introduced in the VSSP according to different metadata access features.  ...  Table I summarizes the test payload and resulting image files in which the image with longer size represents larger file system scale.  ... 
doi:10.1109/nas.2015.7255195 dblp:conf/nas/ZhouCGWM15 fatcat:otndhyex5bashdimmsgz3wspze

Genome classification by gene distribution: An overlapping subspace clustering approach

Jason Li, Saman K Halgamuge, Sen-Lin Tang
2008 BMC Evolutionary Biology  
called HARP to incorporate overlapping capability.  ...  Conclusion: The method described in this paper can assist evolutionary study through objectively classifying genomes based on their resemblance in gene order, gene content and gene positions.  ...  The algorithmic procedure is listed in Table 2 (a more detailed pseudo code can be found in Additional File 1).  ... 
doi:10.1186/1471-2148-8-116 pmid:18430250 pmcid:PMC2383906 fatcat:r2l5dmctrfagjk7cwxz7mzdaky
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