Mixing
how do i differentiate SortedMap from TreeMap in Scala?
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ height:90px;width:728px;box-sizing:border-box;
}
I found out different spark job performances would result from trying SortedMap and TreeMap respectively. SortedMap containing big data in Dataset caused worse performance than TreeMap did.
But I traced the source code and found sortedmap is just converted to treemap when using SortedMap.empty[A, B] to create it.
implicit def canBuildFrom[A, B](implicit ord: Ordering[A]): CanBuildFrom[Coll, (A, B), SortedMap[A, B]] = new SortedMapCanBuildFrom[A, B]
def empty[A, B](implicit ord: Ordering[A]): ***SortedMap[A, B] = TreeMap.empty[A, B]***
Could anyone give some hints on this issue? what are the real differences between SortedMap.empty[A, B] and TreeMap.empty[A, B]?
scala apache-spark
edited Jan 3 at 9:43
Junaid Mujawar
10119
asked Jan 3 at 9:22
kenneth.sunkenneth.sun
35
add a comment |
I found out different spark job performances would result from trying SortedMap and TreeMap respectively. SortedMap containing big data in Dataset caused worse performance than TreeMap did.
But I traced the source code and found sortedmap is just converted to treemap when using SortedMap.empty[A, B] to create it.
implicit def canBuildFrom[A, B](implicit ord: Ordering[A]): CanBuildFrom[Coll, (A, B), SortedMap[A, B]] = new SortedMapCanBuildFrom[A, B]
def empty[A, B](implicit ord: Ordering[A]): ***SortedMap[A, B] = TreeMap.empty[A, B]***
Could anyone give some hints on this issue? what are the real differences between SortedMap.empty[A, B] and TreeMap.empty[A, B]?
scala apache-spark
edited Jan 3 at 9:43
Junaid Mujawar
10119
asked Jan 3 at 9:22
kenneth.sunkenneth.sun
35
1
How were you "trying SortedMap and TreeMap"? How did you measure performance? What was the difference?
– Dima
Jan 3 at 12:59
I extracted data from a hbase table and manipulated them with SortedMap in a spark Dataset. the spark job's execution time was remarkably longer than that with substituting SortedMap with TreeMap. Nothing but this discrepancy in the code. what i am wondering is why. why did such phenomenon emerge?
– kenneth.sun
Jan 4 at 10:01
show the code, and explain how you measure execution time, and what difference you observe in how many experiments.
– Dima
Jan 4 at 15:12
add a comment |
I found out different spark job performances would result from trying SortedMap and TreeMap respectively. SortedMap containing big data in Dataset caused worse performance than TreeMap did.
But I traced the source code and found sortedmap is just converted to treemap when using SortedMap.empty[A, B] to create it.
implicit def canBuildFrom[A, B](implicit ord: Ordering[A]): CanBuildFrom[Coll, (A, B), SortedMap[A, B]] = new SortedMapCanBuildFrom[A, B]
def empty[A, B](implicit ord: Ordering[A]): ***SortedMap[A, B] = TreeMap.empty[A, B]***
Could anyone give some hints on this issue? what are the real differences between SortedMap.empty[A, B] and TreeMap.empty[A, B]?
scala apache-spark
edited Jan 3 at 9:43
Junaid Mujawar
10119
asked Jan 3 at 9:22
kenneth.sunkenneth.sun
35
I found out different spark job performances would result from trying SortedMap and TreeMap respectively. SortedMap containing big data in Dataset caused worse performance than TreeMap did.
But I traced the source code and found sortedmap is just converted to treemap when using SortedMap.empty[A, B] to create it.
implicit def canBuildFrom[A, B](implicit ord: Ordering[A]): CanBuildFrom[Coll, (A, B), SortedMap[A, B]] = new SortedMapCanBuildFrom[A, B]
def empty[A, B](implicit ord: Ordering[A]): ***SortedMap[A, B] = TreeMap.empty[A, B]***
Could anyone give some hints on this issue? what are the real differences between SortedMap.empty[A, B] and TreeMap.empty[A, B]?
scala apache-spark
scala apache-spark
edited Jan 3 at 9:43
Junaid Mujawar
10119
asked Jan 3 at 9:22
kenneth.sunkenneth.sun
35
edited Jan 3 at 9:43
Junaid Mujawar
10119
asked Jan 3 at 9:22
kenneth.sunkenneth.sun
35
edited Jan 3 at 9:43
Junaid Mujawar
10119
edited Jan 3 at 9:43
Junaid Mujawar
10119
edited Jan 3 at 9:43
Junaid Mujawar
10119
10119
asked Jan 3 at 9:22
kenneth.sunkenneth.sun
35
asked Jan 3 at 9:22
kenneth.sunkenneth.sun
35
asked Jan 3 at 9:22
kenneth.sunkenneth.sun
35
35
1
How were you "trying SortedMap and TreeMap"? How did you measure performance? What was the difference?
– Dima
Jan 3 at 12:59
I extracted data from a hbase table and manipulated them with SortedMap in a spark Dataset. the spark job's execution time was remarkably longer than that with substituting SortedMap with TreeMap. Nothing but this discrepancy in the code. what i am wondering is why. why did such phenomenon emerge?
– kenneth.sun
Jan 4 at 10:01
show the code, and explain how you measure execution time, and what difference you observe in how many experiments.
– Dima
Jan 4 at 15:12
add a comment |
1
How were you "trying SortedMap and TreeMap"? How did you measure performance? What was the difference?
– Dima
Jan 3 at 12:59
I extracted data from a hbase table and manipulated them with SortedMap in a spark Dataset. the spark job's execution time was remarkably longer than that with substituting SortedMap with TreeMap. Nothing but this discrepancy in the code. what i am wondering is why. why did such phenomenon emerge?
– kenneth.sun
Jan 4 at 10:01
show the code, and explain how you measure execution time, and what difference you observe in how many experiments.
– Dima
Jan 4 at 15:12
1
1
How were you "trying SortedMap and TreeMap"? How did you measure performance? What was the difference?
– Dima
Jan 3 at 12:59
How were you "trying SortedMap and TreeMap"? How did you measure performance? What was the difference?
– Dima
Jan 3 at 12:59
I extracted data from a hbase table and manipulated them with SortedMap in a spark Dataset. the spark job's execution time was remarkably longer than that with substituting SortedMap with TreeMap. Nothing but this discrepancy in the code. what i am wondering is why. why did such phenomenon emerge?
– kenneth.sun
Jan 4 at 10:01
I extracted data from a hbase table and manipulated them with SortedMap in a spark Dataset. the spark job's execution time was remarkably longer than that with substituting SortedMap with TreeMap. Nothing but this discrepancy in the code. what i am wondering is why. why did such phenomenon emerge?
– kenneth.sun
Jan 4 at 10:01
show the code, and explain how you measure execution time, and what difference you observe in how many experiments.
– Dima
Jan 4 at 15:12
show the code, and explain how you measure execution time, and what difference you observe in how many experiments.
– Dima
Jan 4 at 15:12
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f54019389%2fhow-do-i-differentiate-sortedmap-from-treemap-in-scala%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f54019389%2fhow-do-i-differentiate-sortedmap-from-treemap-in-scala%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
1
How were you "trying SortedMap and TreeMap"? How did you measure performance? What was the difference?
– Dima
Jan 3 at 12:59
I extracted data from a hbase table and manipulated them with SortedMap in a spark Dataset. the spark job's execution time was remarkably longer than that with substituting SortedMap with TreeMap. Nothing but this discrepancy in the code. what i am wondering is why. why did such phenomenon emerge?
– kenneth.sun
Jan 4 at 10:01
show the code, and explain how you measure execution time, and what difference you observe in how many experiments.
– Dima
Jan 4 at 15:12