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right;text-align:right;line-height:20px;margin: 0;color: #aaa;border-radius:
2px;font-family: arial;font-size: 12px;">Version: 0.2.0 | Last Published:
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background: #ddd; padding: 2px 6px;
+ border-radius: 2px; font-size: 12px; text-decoration: none; color:
#666;">Top</a>
+
+
+
<h1><a id="CarbonData_Use_Cases_0"></a>CarbonData Use Cases</h1>
-<p>This tutorial will discuss about the problems that CarbonData address.It
shall take you through the identified top use cases of Carbon.</p>
+<p>This tutorial discusses about the problems that CarbonData addresses. It
shall take you through the identified top use cases of CarbonData.</p>
<h2><a id="Introduction_3"></a>Introduction</h2>
<p>For big data interactive analysis scenarios, many customers expect
sub-second response to query TB-PB level data on general hardware clusters with
just a few nodes.</p>
-<p>In the current big data ecosystem, there are few columnar storage formats
such as ORC and Parquet that are designed for SQL on Big Data. Apache Hiveâs
ORC format is<br>
-a columnar storage format with basic indexing capability. However, ORC cannot
meet the sub-second query response expectation on TB level data, because ORC
format<br>
-performs only stride level dictionary encoding and all analytical operations
such as filtering and aggregation is done on the actual data. Apache Parquet is
columnar<br>
-storage can improve performance in comparison to ORC, because of more
efficient storage organization. Though Parquet can provide query response on TB
level data in a<br>
-few seconds, it is still far from the sub-second expectation of interactive
analysis users. Cloudera Kudu can effectively solve some query performance
issues, but kudu<br>
+<p>In the current big data ecosystem, there are few columnar storage formats
such as ORC and Parquet that are designed for SQL on Big Data. Apache Hiveâs
ORC format is
+a columnar storage format with basic indexing capability. However, ORC cannot
meet the sub-second query response expectation on TB level data, because ORC
format
+performs only stride level dictionary encoding and all analytical operations
such as filtering and aggregation is done on the actual data. Apache Parquet is
columnar
+storage format that can improve performance in comparison to ORC because of
its more efficient storage organization. Though Parquet can provide query
response on TB level data in a
+few seconds, it is still far from the sub-second expectation of interactive
analysis users. Cloudera Kudu can effectively solve some query performance
issues, but kudu
is not hadoop native, canât seamlessly integrate historic HDFS data into new
kudu system.</p>
-<p>However, CarbonData uses specially engineered optimizations targeted to
improve performance of analytical queries which can include filters,
aggregation and distinct counts,<br>
-the required data to be stored in an indexed, well organized, read-optimized
format, CarbonDataâs query performance can achieve sub-second response.</p>
-<h2><a
id="Motivation_Single_Format_to_provide_low_latency_response_for_all_use_cases_16"></a>Motivation:
Single Format to provide low latency response for all use cases</h2>
-<p>The main motivation behind CarbonData is to provide a single storage format
for all the usecases of querying big data on Hadoop. Thus CarbonData is able to
cover all use-cases<br>
+<p>However, CarbonData uses specially engineered optimizations targeted to
improve performance of analytical queries which can include filters,
aggregation and distinct counts,
+the required data needs to be stored in an indexed, well organized,
read-optimized format, CarbonDataâs query performance can achieve sub-second
response.</p>
+<h2><a
id="Motivation_Single_Format_to_provide_low_latency_response_for_all_use_cases_16"></a>Motivation:
Single Format to provide Low Latency Response for all Use Cases</h2>
+<p>The main motivation behind CarbonData is to provide a single storage format
for all the usecases of querying big data on Hadoop. Thus CarbonData is able to
cover all use-cases
into a single storage format.</p>
<p><img src="images/format/carbon_data_motivation.png?raw=true"
alt="Motivation"></p>
-<h2><a id="Use_Cases_22"></a>Use Cases</h2>
<ul>
<li>
<h3><a id="Sequential_Access_23"></a>Sequential Access</h3>
@@ -77,8 +114,7 @@ This results in full scan over the complete store for the
selected columns.</li>
<li>
<h3><a id="Random_Access_34"></a>Random Access</h3>
<ul>
-<li>Supports Point Query. These are queries used from operational applications
and usually select all or most of the columns but do involve a large number
of<br>
-filters which reduce the result to a small size. Such queries generally do not
involve any aggregation or group by clause.
+<li>Supports Point Query. These are queries used from operational applications
and usually select all or most of the columns but do involve a large number of
filters which reduce the result to a small size. Such queries generally do not
involve any aggregation or group by clause.
<ul>
<li>Row-key query(like HBase)</li>
<li>Narrow Scan</li>
@@ -100,7 +136,7 @@ filters which reduce the result to a small size. Such
queries generally do not i
Such queries often select a few columns but involve filters and group by on a
column or a grouping expression.<br>
It also supports queries that :
<ul>
-<li>involves aggregation/join</li>
+<li>Involves aggregation/join</li>
<li>Roll-up,Drill-down,Slicing and Dicing</li>
<li>Low-latency ad-hoc query</li>
</ul>
