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    <completedDate>2010-02-15</completedDate>
    <publishedDate>2010-02-15</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Fault-Tolerant and Decentralized Lease Coordination in Distributed Systems</title>
    <abstract language="eng">Applications which need exclusive access to a shared resource in distributed systems require a fault-tolerant and scalable mechanism to coordinate this exclusive access. Examples of such applications include distributed file systems and master/slave data replication. We present Flease, an algorithm for decentralized and fault-tolerant lease coordination in distributed systems. Our algorithm allows the processes competing for a resource to coordinate exclusive access through leases among themselves without a central component. The resulting system easily scales with an increasing number of nodes and resources. We prove that Flease ensures exclusive access, i.e. guarantees that there is at most one valid lease at any time.</abstract>
    <identifier type="serial">10-02</identifier>
    <identifier type="issn">1438-0064</identifier>
    <identifier type="opus3-id">1225</identifier>
    <identifier type="urn">urn:nbn:de:0297-zib-11658</identifier>
    <author>Björn Kolbeck</author>
    <submitter>unknown unknown</submitter>
    <author>Mikael Högqvist</author>
    <author>Jan Stender</author>
    <author>Felix Hupfeld</author>
    <series>
      <title>ZIB-Report</title>
      <number>10-02</number>
    </series>
    <collection role="ddc" number="510">Mathematik</collection>
    <collection role="institutes" number="vas">Distributed Algorithms and Supercomputing</collection>
    <collection role="projects" number="2006-XtreemFS">2006-XtreemFS</collection>
    <file>https://opus4.kobv.de/opus4-zib/files/1165/flease_zib_report.pdf</file>
  </doc>
  <doc>
    <id>3423</id>
    <completedYear>2010</completedYear>
    <publishedYear>2010</publishedYear>
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    <language>eng</language>
    <pageFirst>51</pageFirst>
    <pageLast>58</pageLast>
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    <publisherName>IEEE Computer Society</publisherName>
    <publisherPlace>Los Alamitos, CA, USA</publisherPlace>
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    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
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    <title language="eng">BabuDB: Fast and Efficient File System Metadata Storage</title>
    <parentTitle language="eng">Storage Network Architecture and Parallel I/Os, IEEE International Workshop on</parentTitle>
    <identifier type="doi">10.1109/SNAPI.2010.14</identifier>
    <enrichment key="PeerReviewed">yes</enrichment>
    <author>Jan Stender</author>
    <author>Björn Kolbeck</author>
    <author>Mikael Högqvist</author>
    <author>Felix Hupfeld</author>
    <collection role="institutes" number="vas">Distributed Algorithms and Supercomputing</collection>
    <collection role="projects" number="2006-BabuDB">2006-BabuDB</collection>
    <collection role="projects" number="2006-XtreemFS">2006-XtreemFS</collection>
    <collection role="projects" number="2006-XtreemOS">2006-XtreemOS</collection>
  </doc>
  <doc>
    <id>3412</id>
    <completedYear>2011</completedYear>
    <publishedYear>2011</publishedYear>
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    <language>eng</language>
    <pageFirst>978</pageFirst>
    <pageLast>988</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume>0</volume>
    <type>article</type>
    <publisherName>IEEE Computer Society</publisherName>
    <publisherPlace>Los Alamitos, CA, USA</publisherPlace>
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    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
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    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Flease - Lease Coordination Without a Lock Server</title>
    <parentTitle language="eng">Parallel and Distributed Processing Symposium, International</parentTitle>
    <identifier type="doi">10.1109/IPDPS.2011.94</identifier>
    <enrichment key="PeerReviewed">yes</enrichment>
    <author>Björn Kolbeck</author>
    <author>Mikael Högqvist</author>
    <author>Jan Stender</author>
    <author>Felix Hupfeld</author>
    <collection role="institutes" number="vas">Distributed Algorithms and Supercomputing</collection>
    <collection role="projects" number="2006-XtreemFS">2006-XtreemFS</collection>
    <collection role="projects" number="2010-Contrail">2010-Contrail</collection>
  </doc>
  <doc>
    <id>3386</id>
    <completedYear>2012</completedYear>
    <publishedYear>2012</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
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    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>doctoralthesis</type>
    <publisherName/>
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    <creatingCorporation/>
    <contributingCorporation>Humboldt-Universität zu Berlin</contributingCorporation>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">A fault-tolerant and scalable protocol for replication in distributed file systems</title>
    <author>Björn Kolbeck</author>
    <collection role="institutes" number="vas">Distributed Algorithms and Supercomputing</collection>
    <collection role="projects" number="2006-XtreemFS">2006-XtreemFS</collection>
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    <id>3425</id>
    <completedYear>2010</completedYear>
    <publishedYear>2010</publishedYear>
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    <language>eng</language>
    <pageFirst>1618</pageFirst>
    <pageLast>1630</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume>78</volume>
    <type>article</type>
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    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
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    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Circular permuted proteins in the universe of protein folds</title>
    <parentTitle language="eng">Proteins</parentTitle>
    <identifier type="doi">10.1002/prot.22678</identifier>
    <enrichment key="PeerReviewed">yes</enrichment>
    <author>T. Schmidt-Goenner</author>
    <author>A. Guerler</author>
    <author>Björn Kolbeck</author>
    <author>E. Knapp</author>
    <collection role="institutes" number="vas">Distributed Algorithms and Supercomputing</collection>
  </doc>
  <doc>
    <id>3431</id>
    <completedYear>2010</completedYear>
    <publishedYear>2010</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
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    <type>conferenceobject</type>
    <publisherName>IEEE Computer Society</publisherName>
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    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Loosely Time-Synchronized Snapshots in Object-Based File Systems</title>
    <parentTitle language="eng">Proceedings of the 29th IEEE International Performance, Computing, and Communications Conference</parentTitle>
    <identifier type="doi">10.1109/PCCC.2010.5682311</identifier>
    <enrichment key="PeerReviewed">yes</enrichment>
    <author>Jan Stender</author>
    <author>Mikael Högqvist</author>
    <author>Björn Kolbeck</author>
    <collection role="institutes" number="vas">Distributed Algorithms and Supercomputing</collection>
    <collection role="projects" number="2006-XtreemFS">2006-XtreemFS</collection>
  </doc>
  <doc>
    <id>3444</id>
    <completedYear>2009</completedYear>
    <publishedYear>2009</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>19</pageFirst>
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    <pageNumber/>
    <edition/>
    <issue/>
    <volume>0</volume>
    <type>article</type>
    <publisherName>IEEE Computer Society</publisherName>
    <publisherPlace>Los Alamitos, CA, USA</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">A Protocol for Efficient and Fault-tolerant File Replication over Wide-Area Networks</title>
    <parentTitle language="eng">TCPP Ph.D. Forum, Int. Parallel and Distributed Processing Symposium</parentTitle>
    <identifier type="doi">10.1109/IPDPS.2009.5160863</identifier>
    <enrichment key="PeerReviewed">yes</enrichment>
    <author>Björn Kolbeck</author>
    <collection role="institutes" number="vas">Distributed Algorithms and Supercomputing</collection>
    <collection role="projects" number="2006-XtreemFS">2006-XtreemFS</collection>
  </doc>
  <doc>
    <id>3451</id>
    <completedYear>2009</completedYear>
    <publishedYear>2009</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>175</pageFirst>
    <pageLast>188</pageLast>
    <pageNumber/>
    <edition/>
    <issue>2</issue>
    <volume>12</volume>
    <type>article</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">FaTLease: scalable fault-tolerant lease negotiation with Paxos</title>
    <parentTitle language="eng">Cluster Computing</parentTitle>
    <identifier type="doi">10.1007/s10586-009-0074-2</identifier>
    <enrichment key="PeerReviewed">yes</enrichment>
    <author>Felix Hupfeld</author>
    <author>Björn Kolbeck</author>
    <author>Jan Stender</author>
    <author>Mikael Högqvist</author>
    <author>Toni Cortes</author>
    <author>Jonathan Martí</author>
    <author>Jesus Malo</author>
    <collection role="institutes" number="vas">Distributed Algorithms and Supercomputing</collection>
    <collection role="projects" number="2006-XtreemFS">2006-XtreemFS</collection>
  </doc>
  <doc>
    <id>3493</id>
    <completedYear>2008</completedYear>
    <publishedYear>2008</publishedYear>
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    <language>eng</language>
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    <pageNumber/>
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    <type>conferenceobject</type>
    <publisherName/>
    <publisherPlace>Boston, MA, USA</publisherPlace>
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    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">FaTLease: Scalable Fault-Tolerant Lease Negotiation with Paxos</title>
    <parentTitle language="eng">ACM/IEEE International Symposium on High Performance Distributed Computing (HPDC)</parentTitle>
    <author>Felix Hupfeld</author>
    <author>Björn Kolbeck</author>
    <author>Jan Stender</author>
    <author>Mikael Högqvist</author>
    <author>Toni Cortes</author>
    <author>Jonathan Martí</author>
    <author>Jesus Malo</author>
    <collection role="institutes" number="vas">Distributed Algorithms and Supercomputing</collection>
    <collection role="projects" number="2006-XtreemFS">2006-XtreemFS</collection>
  </doc>
  <doc>
    <id>3518</id>
    <completedYear>2007</completedYear>
    <publishedYear>2007</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
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    <pageNumber/>
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    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">XtreemFS: a case for object-based storage in Grid data management</title>
    <parentTitle language="eng">3rd VLDB Workshop on Data Management in Grids, co-located with VLDB 2007</parentTitle>
    <author>Felix Hupfeld</author>
    <author>Toni Cortes</author>
    <author>Björn Kolbeck</author>
    <author>Jan Stender</author>
    <author>Erich Focht</author>
    <author>Matthias Hess</author>
    <author>Jesus Malo</author>
    <author>Jonathan Marti</author>
    <author>Eugenio Cesario</author>
    <collection role="institutes" number="vas">Distributed Algorithms and Supercomputing</collection>
    <collection role="projects" number="2006-XtreemFS">2006-XtreemFS</collection>
  </doc>
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    <id>3487</id>
    <completedYear>2008</completedYear>
    <publishedYear>2008</publishedYear>
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    <language>eng</language>
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    <pageLast/>
    <pageNumber/>
    <edition/>
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    <type>conferenceobject</type>
    <publisherName/>
    <publisherPlace>Boston, MA, USA</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Striping without Sacrifices: Maintaining POSIX Semantics in a Parallel File System</title>
    <parentTitle language="eng">Proceedings of the 1st USENIX Workshop on Large-Scale Computing (LASCO’08)</parentTitle>
    <author>Jan Stender</author>
    <author>Björn Kolbeck</author>
    <author>Felix Hupfeld</author>
    <author>Eugenio Cesario</author>
    <author>Erich Focht</author>
    <author>Matthias Hess</author>
    <author>Jesus Malo</author>
    <author>Jonathan Martí</author>
    <collection role="institutes" number="vas">Distributed Algorithms and Supercomputing</collection>
    <collection role="projects" number="2006-XtreemFS">2006-XtreemFS</collection>
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    <id>3488</id>
    <completedYear>2008</completedYear>
    <publishedYear>2008</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue>8</issue>
    <volume>20</volume>
    <type>article</type>
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    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">The XtreemFS architecture - A case for object-based file systems in Grids</title>
    <parentTitle language="eng">Concurrency and Computation: Practice and Experience</parentTitle>
    <author>Felix Hupfeld</author>
    <author>Toni Cortes</author>
    <author>Björn Kolbeck</author>
    <author>Erich Focht</author>
    <author>Matthias Hess</author>
    <author>Jesus Malo</author>
    <author>Jonathan Marti</author>
    <author>Jan Stender</author>
    <author>Eugenio Cesario</author>
    <collection role="institutes" number="vas">Distributed Algorithms and Supercomputing</collection>
    <collection role="projects" number="2006-XtreemFS">2006-XtreemFS</collection>
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    <id>3547</id>
    <completedYear>2005</completedYear>
    <publishedYear>2005</publishedYear>
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    <language>eng</language>
    <pageFirst>122</pageFirst>
    <pageLast>123</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName/>
    <publisherPlace/>
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    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Protein structure alignment based on contact maps and secondary structure.</title>
    <parentTitle language="eng">Proceedings of the German Conference on Bioinformatics (GCB)</parentTitle>
    <author>Björn Kolbeck</author>
    <author>T. Schmidt-Gönner</author>
    <author>Patrick May</author>
    <author>E. Knapp</author>
    <collection role="institutes" number="vas">Distributed Algorithms and Supercomputing</collection>
  </doc>
  <doc>
    <id>3523</id>
    <completedYear>2006</completedYear>
    <publishedYear>2006</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>510</pageFirst>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume>7</volume>
    <type>article</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Connectivity independent protein-structure alignment: a hierarchical approach</title>
    <parentTitle language="eng">BMC Bioinformatics</parentTitle>
    <author>Björn Kolbeck</author>
    <author>Patrick May</author>
    <author>T. Schmidt-Goenner</author>
    <author>Thomas Steinke</author>
    <author>E. Knapp</author>
    <collection role="institutes" number="vas">Distributed Algorithms and Supercomputing</collection>
    <collection role="persons" number="steinke">Steinke, Thomas</collection>
  </doc>
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