<s>
Hector	B-Device
is	O
a	O
high-level	O
client	O
API	B-Application
for	O
Apache	B-Application
Cassandra	I-Application
.	O
</s>
<s>
Named	O
after	O
Hector	B-Device
,	O
a	O
warrior	O
of	O
Troy	O
in	O
Greek	O
mythology	O
,	O
it	O
is	O
a	O
substitute	O
for	O
the	O
Cassandra	B-Application
Java	B-Language
Client	O
,	O
or	O
Thrift	B-Protocol
,	O
that	O
is	O
encapsulated	O
by	O
Hector	B-Device
.	O
</s>
<s>
It	O
also	O
has	O
Maven	B-Language
repository	O
access	O
.	O
</s>
<s>
As	O
Cassandra	B-Application
is	O
shipped	O
with	O
the	O
low-level	O
Thrift	B-Protocol
(	O
protocol	O
)	O
,	O
there	O
was	O
a	O
potential	O
to	O
develop	O
a	O
better	O
protocol	O
for	O
application	O
developers	O
.	O
</s>
<s>
Hector	B-Device
was	O
developed	O
by	O
Ran	O
Tavory	O
as	O
a	O
high-level	O
interface	O
that	O
overlays	O
the	O
shortcomings	O
of	O
Thrift	B-Protocol
.	O
</s>
<s>
It	O
is	O
licensed	O
with	O
the	B-License
MIT	I-License
License	I-License
that	O
allows	O
to	O
use	O
,	O
modify	O
,	O
split	O
and	O
change	O
the	O
design	O
.	O
</s>
<s>
A	O
high-level	O
object	O
oriented	O
interface	O
to	O
Cassandra	B-Application
:	O
It	O
is	O
mainly	O
inspired	O
by	O
the	O
Cassandra-java-client	O
.	O
</s>
<s>
The	O
API	B-Application
is	O
defined	O
in	O
the	O
Keyspace	O
interface	O
.	O
</s>
<s>
Hector	B-Device
provides	O
connection	O
pooling	O
and	O
a	O
nice	O
framework	O
that	O
manages	O
the	O
details	O
.	O
</s>
<s>
Failover	B-General_Concept
support	O
:	O
As	O
Cassandra	B-Application
is	O
a	O
distributed	O
data	O
store	O
where	O
hosts	O
(	O
nodes	O
)	O
may	O
go	O
down	O
.	O
</s>
<s>
Hector	B-Device
has	O
its	O
own	O
failover	B-General_Concept
policy	I-General_Concept
.	O
</s>
<s>
JMX	B-Language
support	O
:	O
Hector	B-Device
exposes	O
JMX	B-Language
for	O
many	O
important	O
runtime	O
metrics	O
,	O
such	O
as	O
number	O
of	O
available	O
connections	O
,	O
idle	O
connections	O
,	O
error	O
statistics	O
.	O
</s>
<s>
Load	B-Application
balancing	I-Application
:	O
A	O
simple	O
load	B-Application
balancing	I-Application
exists	O
in	O
the	O
newer	O
version	O
.	O
</s>
<s>
Supports	O
the	O
command	O
design	O
pattern	O
to	O
allow	O
clients	O
to	O
concentrate	O
on	O
their	O
business	O
logic	O
and	O
let	O
Hector	B-Device
take	O
care	O
of	O
the	O
required	O
plumbing	O
.	O
</s>
<s>
Hector	B-Device
exposes	O
availability	O
counters	O
and	O
statistics	O
through	O
JMX	B-Language
.	O
</s>
<s>
Hector	B-Device
follows	O
two	O
load	B-Application
balancing	I-Application
policies	O
with	O
the	O
LoadBalancingPolicy	O
interface	O
.	O
</s>
<s>
The	O
default	O
is	O
called	O
RoundRobinBalancingPolicy	O
and	O
is	O
a	O
simple	O
round-robin	B-Algorithm
distribution	O
algorithm	O
.	O
</s>
<s>
As	O
an	O
example	O
,	O
an	O
implementation	O
of	O
a	O
simple	O
distributed	O
hashtable	B-Algorithm
over	O
Cassandra	B-Application
is	O
listed	O
.	O
</s>
