[jira] [Commented] (CASSANDRA-12209) Make Level compaction default
[ https://issues.apache.org/jira/browse/CASSANDRA-12209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15384629#comment-15384629 ] Daniel Cohen commented on CASSANDRA-12209: -- Please do not change established, working defaults if not necessary. There is no need whatsoever for this change. It will cause trouble. An advanced user knows how and why to change the compaction strategy. A novice user must be kept safe. > Make Level compaction default > - > > Key: CASSANDRA-12209 > URL: https://issues.apache.org/jira/browse/CASSANDRA-12209 > Project: Cassandra > Issue Type: Wish >Reporter: sankalp kohli >Priority: Minor > > Level Compaction has come a long way since it was added. I think it is time > to make it default. We can debate which version we can do this. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-12209) Make Level compaction default
[ https://issues.apache.org/jira/browse/CASSANDRA-12209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15382447#comment-15382447 ] Brandon Williams commented on CASSANDRA-12209: -- https://www.python.org/dev/peps/pep-0020/ bq. "Explicit is better than implicit." I too, am not a huge fan of a hidden flag to change defaults. Say what you mean, mean what you say. > Make Level compaction default > - > > Key: CASSANDRA-12209 > URL: https://issues.apache.org/jira/browse/CASSANDRA-12209 > Project: Cassandra > Issue Type: Wish >Reporter: sankalp kohli >Priority: Minor > > Level Compaction has come a long way since it was added. I think it is time > to make it default. We can debate which version we can do this. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-12209) Make Level compaction default
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https://issues.apache.org/jira/browse/CASSANDRA-12209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15381923#comment-15381923
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Sylvain Lebresne commented on CASSANDRA-12209:
--
bq. As a middle ground, could we make it configurable? It could become an
'unadvertized' setting, ...
Not a huge fan of adding custom 'unadvertised' config every time someone has an
itch to scratch.
If the problem is that it's annoying to have to pass the same options each time
you create a table because your organization defaults differs from the C* ones,
then I can agree it would be nice to have ways to make that easier, but it's
also a relatively general problem (some other organization might want no
sstable compression by default on all their table, or some some specific
{{read_repair_chance}} setting, ...). So I'd be fine thinking about having a
good mechanism for organization to set cluster-wide table defaults, as it's imo
generally useful, but I'm less enthusiastic about a one-off hack for what is
ultimately a convenience (and for only a handful of people if we end up not
advertising the option).
> Make Level compaction default
> -
>
> Key: CASSANDRA-12209
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12209
> Project: Cassandra
> Issue Type: Wish
>Reporter: sankalp kohli
>Priority: Minor
>
> Level Compaction has come a long way since it was added. I think it is time
> to make it default. We can debate which version we can do this.
--
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[jira] [Commented] (CASSANDRA-12209) Make Level compaction default
[ https://issues.apache.org/jira/browse/CASSANDRA-12209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15381571#comment-15381571 ] Jeff Jirsa commented on CASSANDRA-12209: Middle ground seems better (though since it's impossible to guarantee all nodes in the cluster have the same yaml/system property settings, a user who mixes values may get some surprises - that's on them, though). > Make Level compaction default > - > > Key: CASSANDRA-12209 > URL: https://issues.apache.org/jira/browse/CASSANDRA-12209 > Project: Cassandra > Issue Type: Wish >Reporter: sankalp kohli >Priority: Minor > > Level Compaction has come a long way since it was added. I think it is time > to make it default. We can debate which version we can do this. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-12209) Make Level compaction default
[ https://issues.apache.org/jira/browse/CASSANDRA-12209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15381549#comment-15381549 ] sankalp kohli commented on CASSANDRA-12209: --- +1 for [~jasobrown] suggestion > Make Level compaction default > - > > Key: CASSANDRA-12209 > URL: https://issues.apache.org/jira/browse/CASSANDRA-12209 > Project: Cassandra > Issue Type: Wish >Reporter: sankalp kohli >Priority: Minor > > Level Compaction has come a long way since it was added. I think it is time > to make it default. We can debate which version we can do this. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-12209) Make Level compaction default
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https://issues.apache.org/jira/browse/CASSANDRA-12209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15381333#comment-15381333
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Jason Brown commented on CASSANDRA-12209:
-
As a middle ground, could we make it configurable? It could become an
'unadvertized' setting, either as a {{-D}} param to the jvm or a yaml entry
that we don't bother to put into default {{conf/cassandra.yaml}}.
> Make Level compaction default
> -
>
> Key: CASSANDRA-12209
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12209
> Project: Cassandra
> Issue Type: Wish
>Reporter: sankalp kohli
>Priority: Minor
>
> Level Compaction has come a long way since it was added. I think it is time
> to make it default. We can debate which version we can do this.
--
This message was sent by Atlassian JIRA
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[jira] [Commented] (CASSANDRA-12209) Make Level compaction default
[ https://issues.apache.org/jira/browse/CASSANDRA-12209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15380590#comment-15380590 ] Adam Hattrell commented on CASSANDRA-12209: --- It's pretty hard to break your cluster with STCS (it's possible but the edge cases are much harder to get to) - it's very easy with the other compaction strategies. If you could force users to properly benchmark all their workload before rolling live then, maybe, but even then I'd lean towards staying with the safe option. > Make Level compaction default > - > > Key: CASSANDRA-12209 > URL: https://issues.apache.org/jira/browse/CASSANDRA-12209 > Project: Cassandra > Issue Type: Wish >Reporter: sankalp kohli >Priority: Minor > > Level Compaction has come a long way since it was added. I think it is time > to make it default. We can debate which version we can do this. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-12209) Make Level compaction default
[ https://issues.apache.org/jira/browse/CASSANDRA-12209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15380561#comment-15380561 ] Robert Stupp commented on CASSANDRA-12209: -- >From my experience, many people do not know about the implications (or >requirements) of LCS. Many users initially do _not_ know about how their data >model will look like, what amount of data is ingested and how it is ingested. >As [~brandon.williams] said, STCS is a not super-clever but it works - an it's >used in other compaction strategies as well. I mean, it's not a big deal to >configure the CS in a CREATE TABLE statement. TL;DR I'd prefer to stick with >STCS as the default. > Make Level compaction default > - > > Key: CASSANDRA-12209 > URL: https://issues.apache.org/jira/browse/CASSANDRA-12209 > Project: Cassandra > Issue Type: Wish >Reporter: sankalp kohli >Priority: Minor > > Level Compaction has come a long way since it was added. I think it is time > to make it default. We can debate which version we can do this. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-12209) Make Level compaction default
[ https://issues.apache.org/jira/browse/CASSANDRA-12209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15379961#comment-15379961 ] Jeff Jirsa commented on CASSANDRA-12209: We also use LCS for almost everything that's not time-series. However, I'd prefer leaving STCS as default, if only because the number of STCS-impacting bugs over the years has been fewer than the number of LCS bugs ( they're still showing up, CASSANDRA-11712 wasn't THAT long ago). > Make Level compaction default > - > > Key: CASSANDRA-12209 > URL: https://issues.apache.org/jira/browse/CASSANDRA-12209 > Project: Cassandra > Issue Type: Wish >Reporter: sankalp kohli >Priority: Minor > > Level Compaction has come a long way since it was added. I think it is time > to make it default. We can debate which version we can do this. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-12209) Make Level compaction default
[ https://issues.apache.org/jira/browse/CASSANDRA-12209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15379840#comment-15379840 ] sankalp kohli commented on CASSANDRA-12209: --- Also we already run with this default for years. > Make Level compaction default > - > > Key: CASSANDRA-12209 > URL: https://issues.apache.org/jira/browse/CASSANDRA-12209 > Project: Cassandra > Issue Type: Wish >Reporter: sankalp kohli >Priority: Minor > > Level Compaction has come a long way since it was added. I think it is time > to make it default. We can debate which version we can do this. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-12209) Make Level compaction default
[ https://issues.apache.org/jira/browse/CASSANDRA-12209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15379838#comment-15379838 ] sankalp kohli commented on CASSANDRA-12209: --- We are almost 100% on Leveled till we started using Cassandra. Can other people who use Cassandra comment here and say what they use. > Make Level compaction default > - > > Key: CASSANDRA-12209 > URL: https://issues.apache.org/jira/browse/CASSANDRA-12209 > Project: Cassandra > Issue Type: Wish >Reporter: sankalp kohli >Priority: Minor > > Level Compaction has come a long way since it was added. I think it is time > to make it default. We can debate which version we can do this. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-12209) Make Level compaction default
[ https://issues.apache.org/jira/browse/CASSANDRA-12209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15379737#comment-15379737 ] Tyler Hobbs commented on CASSANDRA-12209: - I also think that STCS is better suited for write-heavy workloads, in general. Since most Cassandra use cases are write-heavy, I think it makes sense to keep the default optimized for that. > Make Level compaction default > - > > Key: CASSANDRA-12209 > URL: https://issues.apache.org/jira/browse/CASSANDRA-12209 > Project: Cassandra > Issue Type: Wish >Reporter: sankalp kohli >Priority: Minor > > Level Compaction has come a long way since it was added. I think it is time > to make it default. We can debate which version we can do this. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-12209) Make Level compaction default
[ https://issues.apache.org/jira/browse/CASSANDRA-12209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15379627#comment-15379627 ] Brandon Williams commented on CASSANDRA-12209: -- It's worth noting that when you get in trouble with compaction (blowing LCS out, etc) that STCS is the real workhorse that saves you. I don't know how many times I've switched someone in bad shape to STCS, at least temporarily, to get the sstable count down before switching back to another strategy. STCS Just Works, imo, even though it isn't terribly clever. > Make Level compaction default > - > > Key: CASSANDRA-12209 > URL: https://issues.apache.org/jira/browse/CASSANDRA-12209 > Project: Cassandra > Issue Type: Wish >Reporter: sankalp kohli >Priority: Minor > > Level Compaction has come a long way since it was added. I think it is time > to make it default. We can debate which version we can do this. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-12209) Make Level compaction default
[ https://issues.apache.org/jira/browse/CASSANDRA-12209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15379513#comment-15379513 ] Aleksey Yeschenko commented on CASSANDRA-12209: --- This has come up before, though I'm failing to find the original ticket. The rationale was 'SSDs are so prevalent now, it's time to switch'. Otherwise, this is a big default change, and you'd need some stronger arguments for making it happen. > Make Level compaction default > - > > Key: CASSANDRA-12209 > URL: https://issues.apache.org/jira/browse/CASSANDRA-12209 > Project: Cassandra > Issue Type: Wish >Reporter: sankalp kohli >Priority: Minor > > Level Compaction has come a long way since it was added. I think it is time > to make it default. We can debate which version we can do this. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-12209) Make Level compaction default
[ https://issues.apache.org/jira/browse/CASSANDRA-12209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15378589#comment-15378589 ] Brandon Williams commented on CASSANDRA-12209: -- Not sure how I feel about this, STCS is still a better universal fit when the workload is unknown, while conversely LCS can be extremely bad in many cases. > Make Level compaction default > - > > Key: CASSANDRA-12209 > URL: https://issues.apache.org/jira/browse/CASSANDRA-12209 > Project: Cassandra > Issue Type: Wish >Reporter: sankalp kohli >Priority: Minor > > Level Compaction has come a long way since it was added. I think it is time > to make it default. We can debate which version we can do this. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-12209) Make Level compaction default
[ https://issues.apache.org/jira/browse/CASSANDRA-12209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15378585#comment-15378585 ] sankalp kohli commented on CASSANDRA-12209: --- cc [~brandon.williams] and [~krummas] > Make Level compaction default > - > > Key: CASSANDRA-12209 > URL: https://issues.apache.org/jira/browse/CASSANDRA-12209 > Project: Cassandra > Issue Type: Wish >Reporter: sankalp kohli >Priority: Minor > > Level Compaction has come a long way since it was added. I think it is time > to make it default. We can debate which version we can do this. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
