<s>
JDK	B-Language
Flight	I-Language
Recorder	I-Language
is	O
an	O
event	O
recorder	O
built	O
into	O
the	O
Java	B-Language
virtual	I-Language
machine	I-Language
.	O
</s>
<s>
It	O
captures	O
information	O
about	O
the	O
JVM	B-Language
itself	O
,	O
and	O
the	O
application	O
running	O
in	O
the	O
JVM	B-Language
.	O
</s>
<s>
The	O
JDK	B-Language
Flight	I-Language
Recorder	I-Language
was	O
designed	O
to	O
minimize	O
the	O
Observer	O
Effect	O
in	O
the	O
profiled	O
system	O
,	O
and	O
is	O
meant	O
to	O
be	O
always	O
on	O
in	O
production	O
systems	O
.	O
</s>
<s>
Analysis	O
and	O
visualization	O
of	O
flight	O
recordings	O
are	O
normally	O
done	O
using	O
JDK	B-Language
Mission	I-Language
Control	I-Language
.	O
</s>
<s>
If	O
converting	O
a	O
binary	O
recording	O
to	O
JSON	B-General_Concept
,	O
it	O
can	O
easily	O
blow	O
up	O
by	O
two	O
orders	O
of	O
magnitude	O
or	O
more	O
,	O
depending	O
on	O
length	O
and	O
content	O
recorded	O
.	O
</s>
<s>
JDK	B-Language
Flight	I-Language
Recorder	I-Language
started	O
out	O
as	O
JRockit	B-Language
Flight	I-Language
Recorder	I-Language
,	O
and	O
was	O
originally	O
used	O
as	O
a	O
means	O
to	O
collect	O
data	O
to	O
be	O
used	O
to	O
improve	O
the	O
JVM	B-Language
itself	O
.	O
</s>
<s>
After	O
Oracle	O
acquired	O
Sun	O
Microsystems	O
,	O
JRockit	B-Language
Flight	I-Language
Recorder	I-Language
was	O
rebranded	O
Java	B-Language
Flight	I-Language
Recorder	I-Language
.	O
</s>
<s>
In	O
2018	O
Java	B-Language
Flight	I-Language
Recorder	I-Language
was	O
open	O
sourced	O
and	O
released	O
as	O
part	O
of	O
OpenJDK	O
11	O
.	O
</s>
<s>
When	O
open	O
sourced	O
it	O
was	O
rebranded	O
JDK	B-Language
Flight	I-Language
Recorder	I-Language
,	O
due	O
to	O
Java	B-Device
trademark	O
issues	O
.	O
</s>
<s>
It	O
does	O
not	O
encompass	O
all	O
the	O
versions	O
that	O
have	O
ever	O
existed	O
,	O
but	O
rather	O
versions	O
that	O
exist	O
in	O
JVMs	B-Language
after	O
the	O
migration	O
to	O
HotSpot	O
.	O
</s>
