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Re: Recovering corrupt HLog files - HBase - [mail # user]
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...They are all pretty large, around 40+mb. Will the walplayer be smart enough to only write edits that still look relevant (i.e. based on timestamps of the edits vs timestamps of the ver...
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Author: Bryan Beaudreault,
2012-06-30, 16:49
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Recovering corrupt HLog files - HBase - [mail # user]
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...Hello all, In an AWS outtage we lost about a 5th of our regionservers, and about an 8th of our total datanodes. Despite a replication factor of 3, it appears we may have lost som...
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Author: Bryan Beaudreault,
2012-06-30, 06:38
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HMaster not failing over dead RegionServers - HBase - [mail # user]
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...Hello all, Tonight in an AWS outtage we lost 11 out of 51 regionservers. All HMasters were unaffected, but the current active master continually spammed messages like this: ...
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Author: Bryan Beaudreault,
2012-06-30, 05:04
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Re: auto-added RegionServers - HBase - [mail # user]
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...We use puppet and ldap to assign cluster names to servers as we spin them in ec2. Our configs are pushed by fabric, which is organized by these cluster n ames. This makes it harder to ...
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Author: Bryan Beaudreault,
2012-05-24, 05:07
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Heavy Writes Block Reads to RegionServer - HBase - [mail # user]
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...We are running a job that does heavy writes into a new table. The table is not pre-split so it has 1 region. I know this is not recommended; we were doing it partially to test th...
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Author: Bryan Beaudreault,
2012-05-15, 21:38
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Re: MR job for creating splits - HBase - [mail # user]
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...Why do you need to know this? Were you trying to do a percentage of rows per region? Otherwise just have a member variable of your reducer class and increment it on each call to ...
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Author: Bryan Beaudreault,
2012-05-13, 16:35
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Re: MR job for creating splits - HBase - [mail # user]
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...I did a very similar approach and it worked fine for me. Just spot check the regions after to make sure they look lexicographically sorted. I used ImmutableBytesWritable as my ke...
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Author: Bryan Beaudreault,
2012-05-13, 02:07
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Re: HBase bulk loaded region can't be splitted - HBase - [mail # user]
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...I haven't done bulk loads using the importtsv tool, but I imagine it works similarly to the mapreduce bulk load tool we are provided. If so, the following stands. In order to do ...
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Author: Bryan Beaudreault,
2012-05-11, 02:56
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Re: HBase Performance Improvements? - HBase - [mail # user]
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...I don't think there is. You need to have a table seeded with the right regions in order to run the bulk loader jobs. My machines are sufficiently fast that it did not take that l...
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Author: Bryan Beaudreault,
2012-05-10, 16:04
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Re: HBase Performance Improvements? - HBase - [mail # user]
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...Since our Key was ImmutableByteWritable (representing a rowKey) and the Value was KeyValue, there could be many KeyValue's per row key (thus values per hadoop key in the reducer). So y...
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Author: Bryan Beaudreault,
2012-05-10, 14:15
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