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[ACCUMULO-4403] Multiple hostname aliases breaks stop-here.sh
- Accumulo - [issue]
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| ...I have a node with /etc/hosts172.22.98.184 jelser-accumulo-180-4.openstacklocal jelser-accumulo-180-4 jelser-accumulo-180-4.openstacklocal.hostname -a returns[accumulo@jelser-accumulo-180-4 ... |
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Snappy as default table.file.compress.type?
- Accumulo - [mail # dev]
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| ...Any reason we don't want to do this? Last rule-of-thumb I heard was that snappy is often close enough in compression to GZ but quite a bit faster (I don't remember exactly how much).- Josh... |
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Re: Snappy as default table.file.compress.type?
- Accumulo - [mail # dev]
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| ...If the crux of your argument was that snappy is always a better choice,then my retort was to say it is not, since sometimes compression ratio canbe a dominant factor. Changes to defaults are... |
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Author: Adam Fuchs,
2016-08-14, 05:47
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Re: Snappy as default table.file.compress.type?
- Accumulo - [mail # dev]
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| ...Yes, it's a simple matter to install the dependency... it just might not beinstalled by default. I'd certainly recommend downstream vendors/packagersadd it as a required or suggested depende... |
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Author: Christopher,
2016-08-14, 05:19
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Re: Snappy as default table.file.compress.type?
- Accumulo - [mail # dev]
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| ...That's a fair point. I'm off in nebulous vendor land and tend to be removedfrom pure Apache Hadoop artifacts. I feel like there's a snappy package (atleast on centos) which is enough, but un... |
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Author: Josh Elser,
2016-08-14, 03:42
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Re: Snappy as default table.file.compress.type?
- Accumulo - [mail # dev]
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| ...Your argument fails to address the performance benefits. I could pose thesame question back to you: you need to prove why we shouldn't use thefaster compression algorithm.I don't mean to be ... |
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Author: Josh Elser,
2016-08-14, 03:39
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Re: Snappy as default table.file.compress.type?
- Accumulo - [mail # dev]
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| ...Perhaps there is a happy medium, though, by not necessarily definingexample configurations by the size of your memory footprint, but instead byperformance configuration? Snappy could be the ... |
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Author: Marc P.,
2016-08-14, 03:36
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Re: Snappy as default table.file.compress.type?
- Accumulo - [mail # dev]
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| ...Native libraries for snappy are also not typically installed by default onLinux distros. Even if the hadoop native libraries are installed, the useris likely going to end up using the Java i... |
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Author: Christopher,
2016-08-14, 03:19
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Re: Snappy as default table.file.compress.type?
- Accumulo - [mail # dev]
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| ...In my experience gz gets roughly 1.5x to 2x better compression than snappy.Snappy is definitely not a pareto improvement (although we tend to usesnappy by default). Since it's not always bet... |
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Author: Adam Fuchs,
2016-08-14, 03:18
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Re: Snappy as default table.file.compress.type?
- Accumulo - [mail # dev]
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| ...Same motivation of using it as for making it the default. I am not aware of any downside to it. It's become pretty standard across all installations I've worked with for years.Asking because... |
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Author: Josh Elser,
2016-08-14, 03:06
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Re: Snappy as default table.file.compress.type?
- Accumulo - [mail # dev]
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| ...Sorry. I wasn't clear. I understand the motivation for using it... I'masking about the motivation for making it the default.Since both are available, I'm not sure the default matters *that* ... |
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Author: Christopher,
2016-08-14, 03:04
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Re: Snappy as default table.file.compress.type?
- Accumulo - [mail # dev]
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| ...In many cases , I would imagine faster is better .On Sat, Aug 13, 2016, 10:56 PM Christopher wrote:... |
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Author: Marc P.,
2016-08-14, 03:01
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[ACCUMULO-4404] Remove all use of hostname aliases in scripts (only use FQDN)
- Accumulo - [issue]
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| ...All of our scripts are extremely goofy to reason about WRT what we "call" a server because we try to be so accommodating to bad DNS setups.We should only use the FQDN everywhere and get rid ... |
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[ACCUMULO-4013] Clean up new warnings
- Accumulo - [issue]
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| ...Looks like several of our branches have had some warnings introduced recently.I'm going to go through and clean these up if possible. Mostly, they're trivial warnings about unclosed resource... |
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[ACCUMULO-3327] tablet server re-reads the bulk loaded flags with every bulk import request
- Accumulo - [issue]
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| ...On a very large cluster, which bulk loads many thousands of files every few minutes, I noticed the servers would reload the bulk imported flags with every request. This put a lot of pr... |
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[ACCUMULO-4402] PID file not populated for tabletserver(s)
- Accumulo - [issue]
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| ...Installed Accumulo with the binary tarball and 3GB native template and the tservers don't have any pid files in ACCUMULO_HOME/run.... |
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[ACCUMULO-4401] Instance name prompt in Initialize infinite loops
- Accumulo - [issue]
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| ...The following change in ACCUMULO-4357 causes accumulo init to prompt the user infinitely for an instance name:@@ -575,7 +575,8 @@ public class Initialize implements KeywordExecutable { ... |
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[ACCUMULO-4357] Remove redundant code
- Accumulo - [issue]
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| ...Minor QC nits quickly and easily fixed: Remove unnecessary generics parameters; prefer diamond operator wherever possible. Remove extra semicolons. Remove redundant interface declarations.... |
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Re: Dealing with FastBulkImportIT
- Accumulo - [mail # dev]
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| ...ACCUMULO-3327 is aperfect example of a performance bug. The tablet servers used to reloadthe bulk imported flags from the metadata table with every request. Thereis nothing... |
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Re: Dealing with FastBulkImportIT
- Accumulo - [mail # dev]
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| ...Good reason to make these tests a requirement for releasing, similar to theway we use the RandomWalk and ContinuousIngest tests. They serve as acheck against performance decreasing cha... |
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Author: Dylan Hutchison,
2016-08-13, 22:40
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Re: Dealing with FastBulkImportIT
- Accumulo - [mail # dev]
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| ...You're completely right. The separation of performance tests and correctness tests is one path forward. I think my only concern there is that, in our past, these tests tend to be ignored and... |
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Author: Josh Elser,
2016-08-13, 20:48
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Re: Dealing with FastBulkImportIT
- Accumulo - [mail # dev]
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| ...Hi Josh,Forgive me for the design question, but shouldn't we distinguish tests ofcorrectness from tests of performance? The following is my understanding oftest categories, which does not to... |
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Author: Dylan Hutchison,
2016-08-13, 20:32
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Re: Dealing with FastBulkImportIT
- Accumulo - [mail # dev]
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| ...I had assumed this test would pass locally (early-2013 MBP, 2.7 GHz Intel Core i7, 16G ram), but nope! 38s and 45+ seconds on two runs.Josh Elser wrote:... |
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Author: Josh Elser,
2016-08-13, 20:03
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Dealing with FastBulkImportIT
- Accumulo - [mail # dev]
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| ...Hi,I have some complaints about FastBulkImportIT (a test added with https://issues.apache.org/jira/browse/ACCUMULO-3327) but no good ideas for how to better test it. As it presently stands, ... |
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Author: Josh Elser,
2016-08-13, 19:01
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Re: Accumulo Limiting Iterator Help
- Accumulo - [mail # user]
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| ...Hi Ryan,I think you could achieve the behavior you described more simply byoverriding hasTop() and returning `false` once your iterator has seen andemitted N entries. No need to re-see... |
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Accumulo Limiting Iterator Help
- Accumulo - [mail # user]
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| ...Hello,I'm trying to write an iterator that gets the top N sorted entries for agiven range over sharded data. I created a custom iterator that extendsSkippingIterator and made it so that it w... |
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Author: Ryan Cunningham,
2016-08-12, 22:02
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