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Re: What are the appropriate steps before performing hardware maintenance? - HBase - [mail # user]
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...Sorry, I should have mentioned before -- we are using CDH 4.2, which does not package the graceful_stop script. Do you happen to know if there's a way to do this through the CDH manager? Per...
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Author: Dan Crosta,
2013-04-25, 16:31
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What are the appropriate steps before performing hardware maintenance? - HBase - [mail # user]
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...We have to perform maintenance on one of our HDFS DataNode/HBase Regionserver machines for a few hours. What are the right steps to take before doing the maintenance in order to ensure limit...
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Author: Dan Crosta,
2013-04-25, 15:25
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Re: Scanner timeout -- any reason not to raise? - HBase - [mail # user]
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...I'm confused -- I only see one setting in CDH manager, what is the name of the other setting? Our load is moderately frequent small writes (in batches of 1000 cells at a time, typicall...
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Author: Dan Crosta,
2013-03-20, 16:32
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Re: Scanner timeout -- any reason not to raise? - HBase - [mail # user]
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...Ah, thanks Ted -- I was wondering what that setting was for. We are using CDH 4.2.0, which is HBase 0.94.2 (give or take a few backports from 0.94.3). Is there any harm in settin...
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Author: Dan Crosta,
2013-03-17, 20:56
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Scanner timeout -- any reason not to raise? - HBase - [mail # user]
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...We occasionally get scanner timeout errors such as "66698ms passed since the last invocation, timeout is currently set to 60000" when iterating a scanner through the Thrift API. Is there any...
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Author: Dan Crosta,
2013-03-17, 18:46
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Re: HBase Thrift inserts bottlenecked somewhere -- but where? - HBase - [mail # user]
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...Fairly small -- row keys 32-48 bytes, column keys about the same, and values 50-100 bytes (with a few outliers that probably go up to 1k). On Mar 3, 2013, at 6:08 AM, Varun Sharma wrot...
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Author: Dan Crosta,
2013-03-03, 13:53
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Re: HBase Thrift inserts bottlenecked somewhere -- but where? - HBase - [mail # user]
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...Hm. This could be part of the problem in our case. Unfortunately we don't have very good control over which rowkeys will come from which workers (we're not using map-reduce or anything like ...
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Author: Dan Crosta,
2013-03-02, 22:29
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Re: HBase Thrift inserts bottlenecked somewhere -- but where? - HBase - [mail # user]
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...On Mar 2, 2013, at 12:38 PM, lars hofhansl wrote: Are these writes synchronized somehow? Could there be a locking problem somewhere that wouldn't show up as utilization of disk or cpu?...
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Author: Dan Crosta,
2013-03-02, 18:47
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Re: HBase Thrift inserts bottlenecked somewhere -- but where? - HBase - [mail # user]
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...On Mar 1, 2013, at 10:53 PM, Ted Yu wrote: I don't see that setting in CDH manager, but the book says the default is 16. If that's true in CDH, that would mean we have 6*16 == 96 which...
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Author: Dan Crosta,
2013-03-02, 17:15
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Re: HBase Thrift inserts bottlenecked somewhere -- but where? - HBase - [mail # user]
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...On Mar 1, 2013, at 10:42 PM, lars hofhansl wrote: That's a good question. Our configuration is actually already exceeding our minimum and desired performance thresholds, so I'm not too...
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Author: Dan Crosta,
2013-03-02, 17:12
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