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Batch.call and dead Region Server. -
HBase - [mail # user]
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...You could use async API such as asynchbase -that you've mentioned- on your client side; or you can write your CP in a async way. IMHO it mostly depends on your API contract and its guarantee... |
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HBase 0.94.9 and Java 7 -
HBase - [mail # user]
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...Guys from Sematext have done some studies, especially about the new GC supplied with Java7. AFAIK no real issue has been spotted so far. On Wed, Jul 17, 2013 at 6:08 AM, Ionut Ignates... |
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ZK-related issue when updating from 0.94.6 to 0.94.8 -
HBase - [mail # user]
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...My RS finally started without the "strange ZK error", but regions are still not moving... Here is the new sample from RS log : http://pastebin.com/raw.php?i=QJxs4chE I can't see ... |
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ZK-related issue when updating from 0.94.6 to 0.94.8 - HBase - [mail # user]
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...Hi there, I'm trying to upgrade from 0.94.6 (distributed mode) to 0.94.8 and I'm seeing strange WARN messages leading in region-less regionserver once updated. Here is the kind o... |
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schema design: rows vs wide columns -
HBase - [mail # user]
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...Wide area :-) I agree with Michael, perhaps the best explanation could be to explicit *WHEN* adding extra CF perfectly makes sense. On Tue, Apr 16, 2013 at 4:35 PM, Michael Sege... |
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HBase random read performance -
HBase - [mail # user]
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...Using bloom filter is almost mandatory there; You might also want to try Short Circuit Reads and be sure you get 100% data locality (major_compact your table first) On Sat, Apr 13, 20... |
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Regionserver goes down while endpoint execution -
HBase - [mail # user]
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...Sure, and it might be costly if your CP is building secondary index through `Put' to external tables/regions. Each of your RPC call will generate another RPC call. Also, take note that your ... |
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Is "synchronized" required? -
HBase - [mail # user]
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...I probably don't know your application enough to make an accurate answer, but you could have a look at asynchbase [ https://github.com/OpenTSDB/asynchbase] if you have thread-safety issues a... |
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Is "synchronized" required? - HBase - [mail # user]
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...Beware, HTablePool is not totally thread-safe as well: https://issues.apache.org/jira/browse/HBASE-6651. On Mon, Feb 4, 2013 at 9:42 PM, Haijia Zhou wrote: > Hi, Bing, ... |
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Tune MapReduce over HBase to insert data -
HBase - [mail # user]
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...I didn't find documentation about these settings ; is it recommended to set it greater than the default value ("1") on modern servers ? Or is it an internal behavior we should not tune by ou... |
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remove dead regions server -
HBase - [mail # user]
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...The easiest way is to restart your HBaseMaster. The next active master will not register the dead RS. On Mon, Feb 4, 2013 at 1:07 PM, Samar Kumar wrote: > Hi Everyone, ... |
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Coprocessor HDFS jar hot deployment -
HBase - [mail # user]
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...Yes of course ; CP is instantiated (and start() method is then called) when the region is starting. When disabling/enabling the table it will force all regions to be re-opened. On Thu... |
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