[Gzz-commits] gzz/Documentation/misc/hemppah-progradu mastert...

[Hermanni Hyytiälä]

CVSROOT:        /cvsroot/gzz
Module name:    gzz
Changes by:     Hermanni Hyytiälä <address@hidden>      03/03/24 11:08:33

Modified files:
        Documentation/misc/hemppah-progradu: masterthesis.tex 
                                             storm_pointerblock_creation.eps 
                                             storm_uml.eps 

Log message:
        updates (5. left)

CVSWeb URLs:
http://savannah.gnu.org/cgi-bin/viewcvs/gzz/gzz/Documentation/misc/hemppah-progradu/masterthesis.tex.diff?tr1=1.178&tr2=1.179&r1=text&r2=text
http://savannah.gnu.org/cgi-bin/viewcvs/gzz/gzz/Documentation/misc/hemppah-progradu/storm_pointerblock_creation.eps.diff?tr1=1.3&tr2=1.4&r1=text&r2=text
http://savannah.gnu.org/cgi-bin/viewcvs/gzz/gzz/Documentation/misc/hemppah-progradu/storm_uml.eps.diff?tr1=1.5&tr2=1.6&r1=text&r2=text

Patches:
Index: gzz/Documentation/misc/hemppah-progradu/masterthesis.tex
diff -u gzz/Documentation/misc/hemppah-progradu/masterthesis.tex:1.178 
gzz/Documentation/misc/hemppah-progradu/masterthesis.tex:1.179
--- gzz/Documentation/misc/hemppah-progradu/masterthesis.tex:1.178      Mon Mar 
24 09:07:50 2003
+++ gzz/Documentation/misc/hemppah-progradu/masterthesis.tex    Mon Mar 24 
11:08:33 2003
@@ -1662,50 +1662,59 @@
 from recent publications: for general discussion about Fenfire in Peer-to-Peer 
environment, 
 see \cite{lukka02freenetguids}, and for detailed Storm design, see 
\cite{fallenstein03storm}.
 
-Storm (for \emph{STORage Module}) is a software module, which is used in the 
Fenfire for
-data storage operations. Storm stores all data as \emph{blocks}, which
+Storm (for \emph{STORage Module}) stores all data as \emph{blocks}, which
 are immutable byte sequences. SHA-1\footnote{SHA-1 is considered as a 
collision free 
 hash function. Therefore, it is very unlikely that two different Storm data 
blocks 
-would have same identifier.} cryptographic content hash \cite{fips-sha-1} is 
used
-for creating location-independent, globally unique identifiers for blocks. 
Additionally,
-SHA-1 \cite{fips-sha-1} is used for verifying the integrity of Storm data 
blocks. Storm
-blocks have much in common with regular files, except that Storm blocks are 
\emph{immutable} as
-any change to the byte sequence would change block's hash value (globally 
unique 
-identifier). This mechanism creates a basis for implementing xanalogical 
storage model 
-in the Fenfire system. Figure \ref{fig:storm_model} illustrates simplified 
Storm storage model.
+would have same identifier.} cryptographic content hash function 
\cite{fips-sha-1} is used
+for creating location-independent, globally unique identifiers for blocks. 
Because of SHA-1
+content hash, all identifiers are directly the data verifiers as well. The 
uniquess of data creates 
+a basis for implementing xanalogical storage model in the Fenfire system. 
Storm blocks have much in common with regular files as they
+both contain the data. The main difference is that Storm blocks are 
\emph{immutable} since any 
+change to the byte sequence would change block's hash value (globally unique 
identifier).  
+
+Support for immutable data is built on the immutable abstraction. Storm uses
+\emph{pointers} and \emph{diffs} for dealing with this kind of data. Using 
diffs
+we are able to store alternative versions of Storm blocks efficiently. In this 
+paper, however, we discuss only pointers as they are part of the thesis' 
research problems. 
+More information about diffs can be found from \cite{fallenstein03storm}. 
+ 
+Pointer \cite{benja02urn5, fallenstein03storm} is a semantic-free updatable 
reference to 
+Storm data block, i.e., a Storm scroll block. Pointer is unique reference to 
the data and it is usually 
+represented as a random string. Storm pointers blocks are rather a 
\emph{concept} of data (e.g., ''The first page of the most recent 
+version of New York Times newspaper'') whereas Storm scroll blocks 
\emph{contain} the data 
+(''New York Times newspaper, 10.10.2002, version 1.0'').
+Figure \ref{fig:storm_model} illustrates simplified Storm storage model with 
pointers. 
+
+Each pointer is associated with a collection of \emph{pointer blocks}. 
+Pointers can be created by a user, before the creation of any pointer blocks. 
Pointer blocks 
+are created automatically by Storm when a scroll block is associated with a 
pointer 
+(e.g., by a user when creating a concept of ''The first page of the most 
recent 
+version of New York Times newspaper''). Pointer block has always a single 
target (i.e., a scroll block) 
+for the pointer, saying that pointer $P$ targets block $B$. In addition to 
this, pointer block 
+may contain a list of zero or more obsoleted pointer blocks, i.e., when a new 
version of pointer 
+block is created, it supersedes one older version which has been created in 
the past using the Storm indexing
+mechanisms. For details, see \cite{fallenstein03storm}. The most current 
pointer 
+block will ''obsolete'' the pointer block targeting the superseded version. 
Next 
+time, when the pointer is used for referring to a specific scroll block, only 
+the most recent pointer's block target is loaded. However, the pointer blocks 
pointing
+to the previous versions remains accessible, if needed. In figure 
\ref{fig:storm_pointercreation}, 
+we show the overall pointer creation process. 
 
 \begin{figure}
 \centering
 \includegraphics[width=10cm, height=10cm]{storm_uml.eps}
-\caption{Implementation of xanalogical storage model on Storm.}
+\caption{Implementation of xanalogical storage model on Storm. Storm storage 
model is based on
+fluid media units, i.e., fluid media units are smallest units of data. 
Currently, Storm provides a support
+for textual fluid media units (characters) only, but a support for arbitrary 
data (e.g., video or music) is 
+planned in future versions of Storm.}
 \label{fig:storm_model}
 \end{figure}
 
-
-In addition to immutable data, Storm has a support for mutable data. Storm uses
-\emph{pointers} and \emph{diffs} for dealing with this kind of data. In this 
paper,
-we discuss only pointers as they are part of the thesis' research problems. 
-More information about diffs can be found from \cite{fallenstein03storm}.
- 
-Pointer \cite{benja02urn5} is a semantic-free updatable reference to 
-Storm data block, named as Storm scroll block. 
-In practice, pointer is a random string, which resembles Universal Resource 
Names 
-(URN) \cite{rfc2396}. Pointer itself doesn't contain any data, it is rather a 
\emph{concept} of
-data. Pointers are created automatically by Storm and each pointer is 
-associated with a collection of \emph{pointer blocks}. Pointer block has a 
single 
-target for the pointer. In figure \ref{fig:storm_model}, we show the overall 
-pointer creation process. Pointer block may contain zero or more obsoleted 
-pointer blocks, i.e., when a new version of scroll block is created, it 
supersedes 
-one older version which has been created in the past. The most current pointer 
-block will ''obsolete'' the pointer block targeting the superseded version. 
Next 
-time, when the pointer is used for referring to a specific scroll block, only 
-the most recent pointer's block target is loaded.
-
 \begin{figure}
 \centering
 \includegraphics[width=15cm, height=10cm]{storm_pointerblock_creation.eps}
 \caption{Creation process of Storm pointer block.}
-\label{fig:storm_model}
+\label{fig:storm_pointercreation}
 \end{figure} 
 
 
Index: gzz/Documentation/misc/hemppah-progradu/storm_pointerblock_creation.eps
diff -u 
gzz/Documentation/misc/hemppah-progradu/storm_pointerblock_creation.eps:1.3 
gzz/Documentation/misc/hemppah-progradu/storm_pointerblock_creation.eps:1.4
--- gzz/Documentation/misc/hemppah-progradu/storm_pointerblock_creation.eps:1.3 
Fri Mar  7 07:40:42 2003
+++ gzz/Documentation/misc/hemppah-progradu/storm_pointerblock_creation.eps     
Mon Mar 24 11:08:33 2003
@@ -1,7 +1,7 @@
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Index: gzz/Documentation/misc/hemppah-progradu/storm_uml.eps
diff -u gzz/Documentation/misc/hemppah-progradu/storm_uml.eps:1.5 
gzz/Documentation/misc/hemppah-progradu/storm_uml.eps:1.6
--- gzz/Documentation/misc/hemppah-progradu/storm_uml.eps:1.5   Fri Mar  7 
07:40:42 2003
+++ gzz/Documentation/misc/hemppah-progradu/storm_uml.eps       Mon Mar 24 
11:08:33 2003
@@ -1,11 +1,11 @@
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