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Re: tservers running out of heap space - Accumulo - [mail # user]
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...So, after removing the bloom filter, I get no OOMs with multiple scanners but my column family only scans are quite slow. Is there any settings you can recommend to enable the CF bloom...
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Author: Anthony Fox,
2012-12-05, 15:55
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Re: tservers running out of heap space - Accumulo - [mail # user]
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...Ok, a bit more info. I set -XX:+HeapDumpOnOutOfMemoryError and took a look at the heap dump. The thread that caused the OOM is reading a column family bloom filter from the Cache...
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Author: Anthony Fox,
2012-11-29, 20:50
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Re: tservers running out of heap space - Accumulo - [mail # user]
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...Since the scan involves an intersecting iterator, it has to scan the entire row range. Also, it's not even very many concurrent clients - between 5 and 10. Should I turn compress...
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Author: Anthony Fox,
2012-11-29, 19:24
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Re: tservers running out of heap space - Accumulo - [mail # user]
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...We're not on 1.4 yet, unfortunately. Are there any config params I can tweak to manipulate the compressor pool? On Thu, Nov 29, 2012 at 1:49 PM, Keith Turner wrote: ...
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Author: Anthony Fox,
2012-11-29, 19:09
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Re: tservers running out of heap space - Accumulo - [mail # user]
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...Compacting down to a single file is not feasible - there's about 70G in 255 tablets across 15 tablet servers. Is there another way to tune the compressor pool or another mechanism to v...
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Author: Anthony Fox,
2012-11-29, 17:20
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tservers running out of heap space - Accumulo - [mail # user]
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...I am experiencing some issues running multiple parallel scans against Accumulo. Running single scans works just fine but when I ramp up the number of simultaneous clients, my tablet se...
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Author: Anthony Fox,
2012-11-29, 16:14
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Re: ranges and iterators that transform results - Accumulo - [mail # user]
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...Yes, we can definitely work around it as you suggest, though the transformed key/value fit the semantics of the domain a bit better. Since we're using the intersecting iterator, I'm tr...
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Author: Anthony Fox,
2012-11-12, 15:29
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ranges and iterators that transform results - Accumulo - [mail # user]
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...I am trying to limit scans to a subset of stored rows by setting ranges. The scan has an iterator that does some aggregation and transformation of the result. Specifically, it ch...
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Author: Anthony Fox,
2012-11-12, 13:51
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Re: Performance of table with large number of column families - Accumulo - [mail # user]
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...Do you mean two partitions per server? In my case, that would correspond to 30 total rows which would make each row very large ... >1G/row. Should I increase the table.split.t...
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Author: Anthony Fox,
2012-11-09, 18:29
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Re: Performance of table with large number of column families - Accumulo - [mail # user]
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...Ok, I reingested with 1000 rows and performance for both single record scans and index scans is much better. I'm going to experiment a bit with the optimal number of rows. Thanks...
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Author: Anthony Fox,
2012-11-09, 18:02
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