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+
+<!DOCTYPE html>
+<!--
+ Generated by Apache Maven Doxia at 2016-11-14
+ Rendered using Reflow Maven Skin 1.1.1 
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+<html  xml:lang="en" lang="en">
+
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+               <title>Apache HBase &#x2013;  
+      Apache HBase (TM) ACID Properties
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HBase Orca'"' /></a>
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+                       <ul class="breadcrumb">
+                               <li class="projectVersion 
version-date">Version: 1.2.4</li>
+                               <li class="divider">|</li>
+                               <li class="publishDate version-date">Last 
Published: 2016-11-14</li>
+                       </ul>
+               </div>
+       </header>
+
+       <div class="main-body">
+       <div class="row">
+               <div class="span12">
+                       <div class="body-content">
+<!-- Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License. --> 
+<div class="section"> 
+ <div class="page-header">
+  <h2 id="About_this_Document">About this Document</h2>
+ </div> 
+ <p>Apache HBase (TM) is not an ACID compliant database. However, it does 
guarantee certain specific properties.</p> 
+ <p>This specification enumerates the ACID properties of HBase.</p> 
+</div> 
+<div class="section"> 
+ <h2 id="Definitions">Definitions</h2> 
+ <p>For the sake of common vocabulary, we define the following terms:</p> 
+ <dl> 
+  <dt>
+    Atomicity 
+  </dt> 
+  <dd>
+    an operation is atomic if it either completes entirely or not at all 
+  </dd> 
+  <dt>
+    Consistency 
+  </dt> 
+  <dd>
+    all actions cause the table to transition from one valid state directly to 
another (eg a row will not disappear during an update, etc) 
+  </dd> 
+  <dt>
+    Isolation 
+  </dt> 
+  <dd>
+    an operation is isolated if it appears to complete independently of any 
other concurrent transaction 
+  </dd> 
+  <dt>
+    Durability 
+  </dt> 
+  <dd>
+    any update that reports &quot;successful&quot; to the client will not be 
lost 
+  </dd> 
+  <dt>
+    Visibility 
+  </dt> 
+  <dd>
+    an update is considered visible if any subsequent read will see the update 
as having been committed 
+  </dd> 
+ </dl> 
+ <p> The terms <i>must</i> and <i>may</i> are used as specified by RFC 2119. 
In short, the word &quot;must&quot; implies that, if some case exists where the 
statement is not true, it is a bug. The word &quot;may&quot; implies that, even 
if the guarantee is provided in a current release, users should not rely on it. 
</p> 
+</div> 
+<div class="section"> 
+ <h2 id="APIs_to_consider">APIs to consider</h2> 
+ <ul> 
+  <li>Read APIs 
+   <ul> 
+    <li>get</li> 
+    <li>scan</li> 
+   </ul> </li> 
+  <li>Write APIs</li> 
+  <ul> 
+   <li>put</li> 
+   <li>batch put</li> 
+   <li>delete</li> 
+  </ul> 
+  <li>Combination (read-modify-write) APIs</li> 
+  <ul> 
+   <li>incrementColumnValue</li> 
+   <li>checkAndPut</li> 
+  </ul> 
+ </ul> 
+</div> 
+<div class="section"> 
+ <h2 id="Guarantees_Provided">Guarantees Provided</h2> 
+ <div class="section"> 
+  <h2 id="Atomicity">Atomicity</h2> 
+  <ol style="list-style-type: decimal"> 
+   <li>All mutations are atomic within a row. Any put will either wholely 
succeed or wholely fail.[3]</li> 
+   <ol style="list-style-type: decimal"> 
+    <li>An operation that returns a &quot;success&quot; code has completely 
succeeded.</li> 
+    <li>An operation that returns a &quot;failure&quot; code has completely 
failed.</li> 
+    <li>An operation that times out may have succeeded and may have failed. 
However, it will not have partially succeeded or failed.</li> 
+   </ol> 
+   <li> This is true even if the mutation crosses multiple column families 
within a row.</li> 
+   <li> APIs that mutate several rows will _not_ be atomic across the multiple 
rows. For example, a multiput that operates on rows 'a','b', and 'c' may return 
having mutated some but not all of the rows. In such cases, these APIs will 
return a list of success codes, each of which may be succeeded, failed, or 
timed out as described above.</li> 
+   <li> The checkAndPut API happens atomically like the typical compareAndSet 
(CAS) operation found in many hardware architectures.</li> 
+   <li> The order of mutations is seen to happen in a well-defined order for 
each row, with no interleaving. For example, if one writer issues the mutation 
&quot;a=1,b=1,c=1&quot; and another writer issues the mutation 
&quot;a=2,b=2,c=2&quot;, the row must either be &quot;a=1,b=1,c=1&quot; or 
&quot;a=2,b=2,c=2&quot; and must <i>not</i> be something like 
&quot;a=1,b=2,c=1&quot;.</li> 
+   <ol style="list-style-type: decimal"> 
+    <li>Please note that this is not true _across rows_ for multirow batch 
mutations.</li> 
+   </ol> 
+  </ol> 
+ </div> 
+ <div class="section"> 
+  <h2 id="Consistency_and_Isolation">Consistency and Isolation</h2> 
+  <ol style="list-style-type: decimal"> 
+   <li>All rows returned via any access API will consist of a complete row 
that existed at some point in the table's history.</li> 
+   <li>This is true across column families - i.e a get of a full row that 
occurs concurrent with some mutations 1,2,3,4,5 will return a complete row that 
existed at some point in time between mutation i and i+1 for some i between 1 
and 5.</li> 
+   <li>The state of a row will only move forward through the history of edits 
to it.</li> 
+  </ol> 
+  <div class="section"> 
+   <h2 id="Consistency_of_Scans">Consistency of Scans</h2> 
+   <p> A scan is <b>not</b> a consistent view of a table. Scans do <b>not</b> 
exhibit <i>snapshot isolation</i>. </p> 
+   <p> Rather, scans have the following properties: </p> 
+   <ol style="list-style-type: decimal"> 
+    <li> Any row returned by the scan will be a consistent view (i.e. that 
version of the complete row existed at some point in time) [1] </li> 
+    <li> A scan will always reflect a view of the data <i>at least as new 
as</i> the beginning of the scan. This satisfies the visibility guarantees 
enumerated below.</li> 
+    <ol style="list-style-type: decimal"> 
+     <li>For example, if client A writes data X and then communicates via a 
side channel to client B, any scans started by client B will contain data at 
least as new as X.</li> 
+     <li>A scan _must_ reflect all mutations committed prior to the 
construction of the scanner, and _may_ reflect some mutations committed 
subsequent to the construction of the scanner.</li> 
+     <li>Scans must include <i>all</i> data written prior to the scan (except 
in the case where data is subsequently mutated, in which case it _may_ reflect 
the mutation)</li> 
+    </ol> 
+   </ol> 
+   <p> Those familiar with relational databases will recognize this isolation 
level as &quot;read committed&quot;. </p> 
+   <p> Please note that the guarantees listed above regarding scanner 
consistency are referring to &quot;transaction commit time&quot;, not the 
&quot;timestamp&quot; field of each cell. That is to say, a scanner started at 
time <i>t</i> may see edits with a timestamp value greater than <i>t</i>, if 
those edits were committed with a &quot;forward dated&quot; timestamp before 
the scanner was constructed. </p> 
+  </div> 
+ </div> 
+ <div class="section"> 
+  <h2 id="Visibility">Visibility</h2> 
+  <ol style="list-style-type: decimal"> 
+   <li> When a client receives a &quot;success&quot; response for any 
mutation, that mutation is immediately visible to both that client and any 
client with whom it later communicates through side channels. [3]</li> 
+   <li> A row must never exhibit so-called &quot;time-travel&quot; properties. 
That is to say, if a series of mutations moves a row sequentially through a 
series of states, any sequence of concurrent reads will return a subsequence of 
those states.</li> 
+   <ol style="list-style-type: decimal"> 
+    <li>For example, if a row's cells are mutated using the 
&quot;incrementColumnValue&quot; API, a client must never see the value of any 
cell decrease.</li> 
+    <li>This is true regardless of which read API is used to read back the 
mutation.</li> 
+   </ol> 
+   <li> Any version of a cell that has been returned to a read operation is 
guaranteed to be durably stored.</li> 
+  </ol> 
+ </div> 
+ <div class="section"> 
+  <h2 id="Durability">Durability</h2> 
+  <ol style="list-style-type: decimal"> 
+   <li> All visible data is also durable data. That is to say, a read will 
never return data that has not been made durable on disk[2]</li> 
+   <li> Any operation that returns a &quot;success&quot; code (eg does not 
throw an exception) will be made durable.[3]</li> 
+   <li> Any operation that returns a &quot;failure&quot; code will not be made 
durable (subject to the Atomicity guarantees above)</li> 
+   <li> All reasonable failure scenarios will not affect any of the guarantees 
of this document.</li> 
+  </ol> 
+ </div> 
+ <div class="section"> 
+  <h2 id="Tunability">Tunability</h2> 
+  <p>All of the above guarantees must be possible within Apache HBase. For 
users who would like to trade off some guarantees for performance, HBase may 
offer several tuning options. For example:</p> 
+  <ul> 
+   <li>Visibility may be tuned on a per-read basis to allow stale reads or 
time travel.</li> 
+   <li>Durability may be tuned to only flush data to disk on a periodic 
basis</li> 
+  </ul> 
+ </div> 
+</div> 
+<div class="section"> 
+ <h2 id="More_Information">More Information</h2> 
+ <p> For more information, see the <a href="book.html#client">client 
architecture</a> or <a href="book.html#datamodel">data model</a> sections in 
the Apache HBase Reference Guide. </p> 
+</div> 
+<div class="section"> 
+ <h2 id="Footnotes">Footnotes</h2> 
+ <p>[1] A consistent view is not guaranteed intra-row scanning -- i.e. 
fetching a portion of a row in one RPC then going back to fetch another portion 
of the row in a subsequent RPC. Intra-row scanning happens when you set a limit 
on how many values to return per Scan#next (See <a class="externalLink" 
href="http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/client/Scan.html#setBatch(int)">Scan#setBatch(int)</a>).
 </p> 
+ <p>[2] In the context of Apache HBase, &quot;durably on disk&quot; implies an 
hflush() call on the transaction log. This does not actually imply an fsync() 
to magnetic media, but rather just that the data has been written to the OS 
cache on all replicas of the log. In the case of a full datacenter power loss, 
it is possible that the edits are not truly durable.</p> 
+ <p>[3] Puts will either wholely succeed or wholely fail, provided that they 
are actually sent to the RegionServer. If the writebuffer is used, Puts will 
not be sent until the writebuffer is filled or it is explicitly flushed.</p> 
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