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Re: Poor HBase map-reduce scan performance - HBase - [mail # user]
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...The table has hashed keys so rows are evenly distributed amongst the regionservers, and load on each regionserver is pretty much the same. I also have per-table balancing turned on. I get mo...
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Author: Bryan Keller,
2013-05-01, 06:02
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Re: Poor HBase map-reduce scan performance - HBase - [mail # user]
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...Yes, I have it enabled (forgot to mention that). On Apr 30, 2013, at 9:56 PM, Ted Yu wrote: ...
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Author: Bryan Keller,
2013-05-01, 05:01
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Re: Poor HBase map-reduce scan performance - HBase - [mail # user]
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...Yes, I have tried various settings for setCaching() and I have setCacheBlocks(false) On Apr 30, 2013, at 9:17 PM, Ted Yu wrote: ...
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Author: Bryan Keller,
2013-05-01, 04:31
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Poor HBase map-reduce scan performance - HBase - [mail # user]
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...I have been attempting to speed up my HBase map-reduce scans for a while now. I have tried just about everything without much luck. I'm running out of ideas and was hoping for some suggestio...
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Author: Bryan Keller,
2013-05-01, 04:01
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Re: Maximizing throughput - HBase - [mail # user]
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...I'll follow up on this in case it is useful to anyone. It seems I was network I/O limited. The switch I was using was in managed mode which decreased throughput to 1gbit/sec within the switc...
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Author: Bryan Keller,
2013-01-15, 17:28
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Re: Maximizing throughput - HBase - [mail # user]
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...Thanks for the responses. I'm running HBase 0.92.1 (Cloudera CDH4). The program is very simple, it inserts batches of rows into a table via multiple threads. I've tried running it with...
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Author: Bryan Keller,
2013-01-11, 17:37
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Re: HBaseClient.call() hang - HBase - [mail # user]
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...Yes, that is what I would expect, but the client is stuck in the Object.wait() call and doesn't get notified until the RPC timeout passes. On Dec 18, 2012, at 12:27 PM, "Mesika, Asaf" ...
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Author: Bryan Keller,
2012-12-18, 22:25
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Re: HBaseClient.call() hang - HBase - [mail # user]
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...The regionserver shutdowns I have pretty much under control. My main problems is with the Object.wait() hang and RPC timeout with very selective filters. My region sizes are 4gb for this par...
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Author: Bryan Keller,
2012-12-18, 20:05
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Re: HBaseClient.call() hang - HBase - [mail # user]
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...It seems there was a cascading effect. The regionservers were busy with scanning a table, which resulted in some long GC's. The GC's were long enough to trigger the Zookeeper timeout on at l...
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Author: Bryan Keller,
2012-12-17, 17:18
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Re: HBaseClient.call() hang - HBase - [mail # user]
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...Forgot to mention that. It's version 0.92.1 (Cloudera CDH4.1.1), running on CentOS 6 64 bit, Java 1.6.0_31 On Dec 14, 2012, at 5:31 PM, lars hofhansl wrote: ...
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Author: Bryan Keller,
2012-12-15, 05:29
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