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Posted to issues@hbase.apache.org by "Jonathan Hsieh (Created) (JIRA)" <ji...@apache.org> on 2012/04/14 00:15:16 UTC
[jira] [Created] (HBASE-5786) Implement histogram metrics for flush
and compaction latencies and sizes.
Implement histogram metrics for flush and compaction latencies and sizes.
-------------------------------------------------------------------------
Key: HBASE-5786
URL: https://issues.apache.org/jira/browse/HBASE-5786
Project: HBase
Issue Type: New Feature
Components: metrics, regionserver
Affects Versions: 0.92.2, 0.94.0, 0.96.0
Reporter: Jonathan Hsieh
Assignee: Shaneal Manek
Average time for region operations doesn't really tell a useful story when that help diagnose anomalous conditions.
It would be extremely useful to add histogramming metrics similar to HBASE-5533 for region operations like flush, compaction and splitting. The probably should be forward biased at a much coarser granularity however (maybe decay every day?)
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[jira] [Updated] (HBASE-5786) Implement histogram metrics for flush
and compaction latencies and sizes.
Posted by "Shaneal Manek (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HBASE-5786?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Shaneal Manek updated HBASE-5786:
---------------------------------
Assignee: (was: Shaneal Manek)
> Implement histogram metrics for flush and compaction latencies and sizes.
> -------------------------------------------------------------------------
>
> Key: HBASE-5786
> URL: https://issues.apache.org/jira/browse/HBASE-5786
> Project: HBase
> Issue Type: New Feature
> Components: metrics, regionserver
> Affects Versions: 0.92.2, 0.94.0, 0.96.0
> Reporter: Jonathan Hsieh
>
> Average time for region operations doesn't really tell a useful story when that help diagnose anomalous conditions.
> It would be extremely useful to add histogramming metrics similar to HBASE-5533 for region operations like flush, compaction and splitting. The probably should be forward biased at a much coarser granularity however (maybe decay every day?)
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[jira] [Commented] (HBASE-5786) Implement histogram metrics for
flush and compaction latencies and sizes.
Posted by "Jonathan Hsieh (Commented) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HBASE-5786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13253861#comment-13253861 ]
Jonathan Hsieh commented on HBASE-5786:
---------------------------------------
At least for the constant write load testing I'm doing currently, 1000 entries would are exhausted in about 8 hours.
The histogramming currently uses reservoir sampling (with 100 slots) to keep metrics over all time. Forward biasing makes more recent entries favored.
With the sampling method we could keep reasonable metrics for longer periods of time (weeks).
> Implement histogram metrics for flush and compaction latencies and sizes.
> -------------------------------------------------------------------------
>
> Key: HBASE-5786
> URL: https://issues.apache.org/jira/browse/HBASE-5786
> Project: HBase
> Issue Type: New Feature
> Components: metrics, regionserver
> Affects Versions: 0.92.2, 0.94.0, 0.96.0
> Reporter: Jonathan Hsieh
> Assignee: Shaneal Manek
>
> Average time for region operations doesn't really tell a useful story when that help diagnose anomalous conditions.
> It would be extremely useful to add histogramming metrics similar to HBASE-5533 for region operations like flush, compaction and splitting. The probably should be forward biased at a much coarser granularity however (maybe decay every day?)
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[jira] [Commented] (HBASE-5786) Implement histogram metrics for
flush and compaction latencies and sizes.
Posted by "Elliott Clark (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HBASE-5786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13399488#comment-13399488 ]
Elliott Clark commented on HBASE-5786:
--------------------------------------
You're absolutely right about it being Zipfan, I was just trying to discuss the upper bound on error without having to do the math for confidence with different distributions. Seems like another issue should be filed to implement different sampling so that we don't de-rail this one too much.
> Implement histogram metrics for flush and compaction latencies and sizes.
> -------------------------------------------------------------------------
>
> Key: HBASE-5786
> URL: https://issues.apache.org/jira/browse/HBASE-5786
> Project: HBase
> Issue Type: New Feature
> Components: metrics, regionserver
> Affects Versions: 0.92.2, 0.94.0, 0.96.0
> Reporter: Jonathan Hsieh
>
> Average time for region operations doesn't really tell a useful story when that help diagnose anomalous conditions.
> It would be extremely useful to add histogramming metrics similar to HBASE-5533 for region operations like flush, compaction and splitting. The probably should be forward biased at a much coarser granularity however (maybe decay every day?)
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[jira] [Commented] (HBASE-5786) Implement histogram metrics for
flush and compaction latencies and sizes.
Posted by "Zhihong Ted Yu (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HBASE-5786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13409801#comment-13409801 ]
Zhihong Ted Yu commented on HBASE-5786:
---------------------------------------
MetricsHistogram depends on the following:
{code}
import org.apache.hadoop.metrics.MetricsRecord;
import org.apache.hadoop.metrics.util.MetricsBase;
import org.apache.hadoop.metrics.util.MetricsRegistry;
{code}
which are deprecated in hadoop.
See discussion 'deprecating (old) metrics in favor of metrics2 framework' on dev@ list.
> Implement histogram metrics for flush and compaction latencies and sizes.
> -------------------------------------------------------------------------
>
> Key: HBASE-5786
> URL: https://issues.apache.org/jira/browse/HBASE-5786
> Project: HBase
> Issue Type: New Feature
> Components: metrics, regionserver
> Affects Versions: 0.92.2, 0.94.0, 0.96.0
> Reporter: Jonathan Hsieh
>
> Average time for region operations doesn't really tell a useful story when that help diagnose anomalous conditions.
> It would be extremely useful to add histogramming metrics similar to HBASE-5533 for region operations like flush, compaction and splitting. The probably should be forward biased at a much coarser granularity however (maybe decay every day?)
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[jira] [Commented] (HBASE-5786) Implement histogram metrics for
flush and compaction latencies and sizes.
Posted by "Elliott Clark (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HBASE-5786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13399454#comment-13399454 ]
Elliott Clark commented on HBASE-5786:
--------------------------------------
The library we use takes time decaying samples in buckets. So yes we lose some accuracy in the higher percentiles if that extreme data was a long time ago. However for newer data we are more accurate; if the spread of times stay constant then we'll be very accurate. If our data was normally distributed we would have less than 5% error (at least from my understanding of http://www.research.att.com/people/Cormode_Graham/library/publications/CormodeShkapenyukSrivastavaXu09.pdf) on the all of the measures. For me 5% error upper bound on a metric seems good enough. All of the other methods that I looked at take a lot longer to compute, and so I don't think they are worth it.
> Implement histogram metrics for flush and compaction latencies and sizes.
> -------------------------------------------------------------------------
>
> Key: HBASE-5786
> URL: https://issues.apache.org/jira/browse/HBASE-5786
> Project: HBase
> Issue Type: New Feature
> Components: metrics, regionserver
> Affects Versions: 0.92.2, 0.94.0, 0.96.0
> Reporter: Jonathan Hsieh
>
> Average time for region operations doesn't really tell a useful story when that help diagnose anomalous conditions.
> It would be extremely useful to add histogramming metrics similar to HBASE-5533 for region operations like flush, compaction and splitting. The probably should be forward biased at a much coarser granularity however (maybe decay every day?)
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[jira] [Commented] (HBASE-5786) Implement histogram metrics for
flush and compaction latencies and sizes.
Posted by "Jonathan Creasy (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HBASE-5786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13415856#comment-13415856 ]
Jonathan Creasy commented on HBASE-5786:
----------------------------------------
Working on this tonight. I'll just use the MetricsHistogram for now.
> Implement histogram metrics for flush and compaction latencies and sizes.
> -------------------------------------------------------------------------
>
> Key: HBASE-5786
> URL: https://issues.apache.org/jira/browse/HBASE-5786
> Project: HBase
> Issue Type: New Feature
> Components: metrics, regionserver
> Affects Versions: 0.92.2, 0.94.0, 0.96.0
> Reporter: Jonathan Hsieh
> Fix For: 0.96.0
>
>
> Average time for region operations doesn't really tell a useful story when that help diagnose anomalous conditions.
> It would be extremely useful to add histogramming metrics similar to HBASE-5533 for region operations like flush, compaction and splitting. The probably should be forward biased at a much coarser granularity however (maybe decay every day?)
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[jira] [Commented] (HBASE-5786) Implement histogram metrics for
flush and compaction latencies and sizes.
Posted by "Andrew Wang (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HBASE-5786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13399576#comment-13399576 ]
Andrew Wang commented on HBASE-5786:
------------------------------------
Opened HBASE-6261 for high-percentile latency estimation, lets take it there.
> Implement histogram metrics for flush and compaction latencies and sizes.
> -------------------------------------------------------------------------
>
> Key: HBASE-5786
> URL: https://issues.apache.org/jira/browse/HBASE-5786
> Project: HBase
> Issue Type: New Feature
> Components: metrics, regionserver
> Affects Versions: 0.92.2, 0.94.0, 0.96.0
> Reporter: Jonathan Hsieh
>
> Average time for region operations doesn't really tell a useful story when that help diagnose anomalous conditions.
> It would be extremely useful to add histogramming metrics similar to HBASE-5533 for region operations like flush, compaction and splitting. The probably should be forward biased at a much coarser granularity however (maybe decay every day?)
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[jira] [Commented] (HBASE-5786) Implement histogram metrics for
flush and compaction latencies and sizes.
Posted by "Andrew Wang (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HBASE-5786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13399053#comment-13399053 ]
Andrew Wang commented on HBASE-5786:
------------------------------------
A real stats expert can weigh in, but I don't think the current sampling methods are well-suited for computing high-percentile latencies. Reservoir sampling is fine for computing gross statistics like the mean and stddev, but you really want to be biasing your sampling toward the top end for accurate 95th and 99th percentile estimates.
I unfortunately don't have any solutions yet, but I'm looking into it.
> Implement histogram metrics for flush and compaction latencies and sizes.
> -------------------------------------------------------------------------
>
> Key: HBASE-5786
> URL: https://issues.apache.org/jira/browse/HBASE-5786
> Project: HBase
> Issue Type: New Feature
> Components: metrics, regionserver
> Affects Versions: 0.92.2, 0.94.0, 0.96.0
> Reporter: Jonathan Hsieh
>
> Average time for region operations doesn't really tell a useful story when that help diagnose anomalous conditions.
> It would be extremely useful to add histogramming metrics similar to HBASE-5533 for region operations like flush, compaction and splitting. The probably should be forward biased at a much coarser granularity however (maybe decay every day?)
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[jira] [Commented] (HBASE-5786) Implement histogram metrics for
flush and compaction latencies and sizes.
Posted by "Elliott Clark (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HBASE-5786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13409791#comment-13409791 ]
Elliott Clark commented on HBASE-5786:
--------------------------------------
@jonathan
This would be a good project to get you started. I would ignore the discussions about the accuracy of our histograms and just use the MetricsHistogram for now.
> Implement histogram metrics for flush and compaction latencies and sizes.
> -------------------------------------------------------------------------
>
> Key: HBASE-5786
> URL: https://issues.apache.org/jira/browse/HBASE-5786
> Project: HBase
> Issue Type: New Feature
> Components: metrics, regionserver
> Affects Versions: 0.92.2, 0.94.0, 0.96.0
> Reporter: Jonathan Hsieh
>
> Average time for region operations doesn't really tell a useful story when that help diagnose anomalous conditions.
> It would be extremely useful to add histogramming metrics similar to HBASE-5533 for region operations like flush, compaction and splitting. The probably should be forward biased at a much coarser granularity however (maybe decay every day?)
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[jira] [Updated] (HBASE-5786) Implement histogram metrics for flush
and compaction latencies and sizes.
Posted by "Zhihong Ted Yu (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HBASE-5786?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Zhihong Ted Yu updated HBASE-5786:
----------------------------------
Fix Version/s: 0.96.0
> Implement histogram metrics for flush and compaction latencies and sizes.
> -------------------------------------------------------------------------
>
> Key: HBASE-5786
> URL: https://issues.apache.org/jira/browse/HBASE-5786
> Project: HBase
> Issue Type: New Feature
> Components: metrics, regionserver
> Affects Versions: 0.92.2, 0.94.0, 0.96.0
> Reporter: Jonathan Hsieh
> Fix For: 0.96.0
>
>
> Average time for region operations doesn't really tell a useful story when that help diagnose anomalous conditions.
> It would be extremely useful to add histogramming metrics similar to HBASE-5533 for region operations like flush, compaction and splitting. The probably should be forward biased at a much coarser granularity however (maybe decay every day?)
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[jira] [Commented] (HBASE-5786) Implement histogram metrics for
flush and compaction latencies and sizes.
Posted by "Todd Lipcon (Commented) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HBASE-5786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13253831#comment-13253831 ]
Todd Lipcon commented on HBASE-5786:
------------------------------------
Or even keep a round robin buffer of the last 1000 such operations? It would be a miniscule amount of RAM to track this, right?
> Implement histogram metrics for flush and compaction latencies and sizes.
> -------------------------------------------------------------------------
>
> Key: HBASE-5786
> URL: https://issues.apache.org/jira/browse/HBASE-5786
> Project: HBase
> Issue Type: New Feature
> Components: metrics, regionserver
> Affects Versions: 0.92.2, 0.94.0, 0.96.0
> Reporter: Jonathan Hsieh
> Assignee: Shaneal Manek
>
> Average time for region operations doesn't really tell a useful story when that help diagnose anomalous conditions.
> It would be extremely useful to add histogramming metrics similar to HBASE-5533 for region operations like flush, compaction and splitting. The probably should be forward biased at a much coarser granularity however (maybe decay every day?)
--
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[jira] [Commented] (HBASE-5786) Implement histogram metrics for
flush and compaction latencies and sizes.
Posted by "Andrew Wang (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HBASE-5786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13399486#comment-13399486 ]
Andrew Wang commented on HBASE-5786:
------------------------------------
I don't think you can assume a normal distribution for latency. I think it looks more Zipfian in practice, or maybe bi-modal because of cache misses. Also, a 5% error on a 95th percentile is kind of huge; IIUC, that means it's actually reporting between the 90th and 100th percentile. [1] by the same authors as your link discusses sampling for high-percentiles.
I found [2] which I think is well-suited for our use case, since it can do approximate quantiles on a sliding time window. Space and time bounds seems to be O(reasonable log factors). Somehow mashing up [2] to use [1] would be most optimal, but doing just [2] is probably okay too.
[1] http://www.cs.rutgers.edu/~muthu/bquant.pdf
[2] http://infolab.stanford.edu/~manku/papers/04pods-sliding.pdf
> Implement histogram metrics for flush and compaction latencies and sizes.
> -------------------------------------------------------------------------
>
> Key: HBASE-5786
> URL: https://issues.apache.org/jira/browse/HBASE-5786
> Project: HBase
> Issue Type: New Feature
> Components: metrics, regionserver
> Affects Versions: 0.92.2, 0.94.0, 0.96.0
> Reporter: Jonathan Hsieh
>
> Average time for region operations doesn't really tell a useful story when that help diagnose anomalous conditions.
> It would be extremely useful to add histogramming metrics similar to HBASE-5533 for region operations like flush, compaction and splitting. The probably should be forward biased at a much coarser granularity however (maybe decay every day?)
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[jira] [Commented] (HBASE-5786) Implement histogram metrics for
flush and compaction latencies and sizes.
Posted by "Jonathan Creasy (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HBASE-5786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13409725#comment-13409725 ]
Jonathan Creasy commented on HBASE-5786:
----------------------------------------
I'm interested in working on a patch for this, it seems like a pretty good starter task for getting involved in HBASE development.
> Implement histogram metrics for flush and compaction latencies and sizes.
> -------------------------------------------------------------------------
>
> Key: HBASE-5786
> URL: https://issues.apache.org/jira/browse/HBASE-5786
> Project: HBase
> Issue Type: New Feature
> Components: metrics, regionserver
> Affects Versions: 0.92.2, 0.94.0, 0.96.0
> Reporter: Jonathan Hsieh
>
> Average time for region operations doesn't really tell a useful story when that help diagnose anomalous conditions.
> It would be extremely useful to add histogramming metrics similar to HBASE-5533 for region operations like flush, compaction and splitting. The probably should be forward biased at a much coarser granularity however (maybe decay every day?)
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[jira] [Commented] (HBASE-5786) Implement histogram metrics for
flush and compaction latencies and sizes.
Posted by "Elliott Clark (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HBASE-5786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13396880#comment-13396880 ]
Elliott Clark commented on HBASE-5786:
--------------------------------------
I actually think that most metrics should go toward histograms rather than TimeVaryingRate . Others have mentioned that an average is not really useful when hbase is the primary data store of a live website/app. That use case is much more interested in the 75/95/99th percentile. Once HBASE-6211 is in I can take this up. Maybe with some of the metrics refactor that Lars is talking about.
> Implement histogram metrics for flush and compaction latencies and sizes.
> -------------------------------------------------------------------------
>
> Key: HBASE-5786
> URL: https://issues.apache.org/jira/browse/HBASE-5786
> Project: HBase
> Issue Type: New Feature
> Components: metrics, regionserver
> Affects Versions: 0.92.2, 0.94.0, 0.96.0
> Reporter: Jonathan Hsieh
>
> Average time for region operations doesn't really tell a useful story when that help diagnose anomalous conditions.
> It would be extremely useful to add histogramming metrics similar to HBASE-5533 for region operations like flush, compaction and splitting. The probably should be forward biased at a much coarser granularity however (maybe decay every day?)
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[jira] [Commented] (HBASE-5786) Implement histogram metrics for
flush and compaction latencies and sizes.
Posted by "Elliott Clark (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HBASE-5786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13409812#comment-13409812 ]
Elliott Clark commented on HBASE-5786:
--------------------------------------
Yes Ted it is deprecated. However right now it's the best that we have. I have other jira's that have metrics2 implementations. However I don't think that it's appropriate to expect a first time contributor to make all of those changes before adding a smaller fix. When we move all of our implementation over to metrics2 MetricsHistogram will have to be addressed there too.
> Implement histogram metrics for flush and compaction latencies and sizes.
> -------------------------------------------------------------------------
>
> Key: HBASE-5786
> URL: https://issues.apache.org/jira/browse/HBASE-5786
> Project: HBase
> Issue Type: New Feature
> Components: metrics, regionserver
> Affects Versions: 0.92.2, 0.94.0, 0.96.0
> Reporter: Jonathan Hsieh
>
> Average time for region operations doesn't really tell a useful story when that help diagnose anomalous conditions.
> It would be extremely useful to add histogramming metrics similar to HBASE-5533 for region operations like flush, compaction and splitting. The probably should be forward biased at a much coarser granularity however (maybe decay every day?)
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[jira] [Issue Comment Edited] (HBASE-5786) Implement histogram
metrics for flush and compaction latencies and sizes.
Posted by "Jonathan Hsieh (Issue Comment Edited) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HBASE-5786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13253861#comment-13253861 ]
Jonathan Hsieh edited comment on HBASE-5786 at 4/13/12 11:26 PM:
-----------------------------------------------------------------
At least for the constant write load testing I'm doing currently, 1000 entries would are exhausted in about 8 hours.
The histogramming currently uses reservoir sampling (with 1000 slots) to keep metrics over all time. Forward biasing makes more recent entries favored.
With the sampling method we could keep reasonable metrics for longer periods of time (weeks).
was (Author: jmhsieh):
At least for the constant write load testing I'm doing currently, 1000 entries would are exhausted in about 8 hours.
The histogramming currently uses reservoir sampling (with 100 slots) to keep metrics over all time. Forward biasing makes more recent entries favored.
With the sampling method we could keep reasonable metrics for longer periods of time (weeks).
> Implement histogram metrics for flush and compaction latencies and sizes.
> -------------------------------------------------------------------------
>
> Key: HBASE-5786
> URL: https://issues.apache.org/jira/browse/HBASE-5786
> Project: HBase
> Issue Type: New Feature
> Components: metrics, regionserver
> Affects Versions: 0.92.2, 0.94.0, 0.96.0
> Reporter: Jonathan Hsieh
> Assignee: Shaneal Manek
>
> Average time for region operations doesn't really tell a useful story when that help diagnose anomalous conditions.
> It would be extremely useful to add histogramming metrics similar to HBASE-5533 for region operations like flush, compaction and splitting. The probably should be forward biased at a much coarser granularity however (maybe decay every day?)
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