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Re: Table splitting - Accumulo - [mail # user]
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...On Wed, Dec 12, 2012 at 1:36 PM, Eric Newton wrote: That seems to be enough to ensure that blocks are local to the new host to which the tablet was migrated. We do see a f...
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Author: ameet kini,
2012-12-12, 18:45
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Re: Table splitting - Accumulo - [mail # user]
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...If its moved for balance or recovery purposes, are there any mechanisms to copy the blocks over to the new location? Would compaction be this mechanism? Or is it automatically done as part o...
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Author: ameet kini,
2012-12-12, 18:32
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Re: Table splitting - Accumulo - [mail # user]
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...Ok, so in short, assuming that there's sufficient local disk space, a given tablet having all its blocks local relies on HDFS's guarantee that the first replica of a block will be local as l...
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Author: ameet kini,
2012-12-12, 18:27
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Re: Table splitting - Accumulo - [mail # user]
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...Along these lines.... Can someone help me understand how tablets map to files on disk in HDFS? files on HDFS for a given tablet. Each file can consist of multiple HDFS blocks. Does Acc...
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Author: ameet kini,
2012-12-12, 18:08
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Re: Using Accumulo as input to a MapReduce job frequently hangs due to lost Zookeeper connection - Accumulo - [mail # user]
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...My previous post had some stale text after my signature - sorry. Reposting after chopping the stale text off. Turns out that my assumption of tables being partitioned the same way may ...
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Author: ameet kini,
2012-10-17, 14:13
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Re: Using Accumulo as input to a MapReduce job frequently hangs due to lost Zookeeper connection - Accumulo - [mail # user]
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...Turns out that my assumption of tables being partitioned the same way may be too restrictive. I need to account for join partitions not being co-located on the same tablet server. So the Com...
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Author: ameet kini,
2012-10-17, 14:10
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Re: Concurrent updates - Accumulo - [mail # user]
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...Alternately, for two rollups - summing by day and week - you could insert into two different columns, with each configured with its own combiner. The advantage with this scheme is that both ...
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Author: ameet kini,
2012-10-17, 12:40
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Re: Using Accumulo as input to a MapReduce job frequently hangs due to lost Zookeeper connection - Accumulo - [mail # user]
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...I have a related problem where I need to do a 1-1 join (every row in table A joins with a unique row in table B and vice versa). My join key is the row id of the table. In the past, I've use...
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Author: ameet kini,
2012-10-10, 14:22
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Re: compressing values returned to scanner - Accumulo - [mail # user]
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...In re-reading your response, I may have overlooked one key point. Are the keys+values compressed together as one block? If thats the case, I can see why its not possible to only decom...
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Author: ameet kini,
2012-10-02, 18:48
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Re: compressing values returned to scanner - Accumulo - [mail # user]
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...keys, I understand, but why do values need to be decompressed if there were no user iterators installed on the server? Are there system iterators that look inside the value? Ameet &nbs...
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Author: ameet kini,
2012-10-02, 18:30
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