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Re: question about ZKFC daemon - HDFS - [mail # user]
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...On Mon, Jan 14, 2013 at 11:49 AM, Colin McCabe wrote: Er, this should read "You also need to run ZooKeeper on at least 3 nodes." ZKFC, which talks to ZooKeeper, runs on onl...
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Author: Colin McCabe,
2013-01-14, 20:34
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Re: question about ZKFC daemon - HDFS - [mail # user]
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...Hi ESGLinux, In production, you need to run QJM on at least 3 nodes. You also need to run ZKFC on at least 3 nodes. You can run them on the same nodes if you like, though. ...
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Author: Colin McCabe,
2013-01-14, 19:49
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Re: Release of Decompressor resources in CodecPool - HDFS - [mail # dev]
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...I think that you're right. It looks like BuiltInGzipDecompressor, which is marked as DoNotPool, ends up owning some JNI-managed resources. In this case, just relying on the GC to...
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Author: Colin McCabe,
2012-12-27, 21:08
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Re: Recovering fsImage from Namenode Logs - HDFS - [mail # dev]
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...On Thu, Dec 20, 2012 at 12:33 AM, ishan chhabra wrote: The generation stamp is stored by the datanode in the block directory, as part of the .meta filename. For example, if...
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Author: Colin McCabe,
2012-12-27, 20:41
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Re: FSDataInputStream.read returns -1 with growing file and never continues reading - HDFS - [mail # dev]
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...Also, read() returning -1 is not an error, it's EOF. This is the same as for the regular Java InputStream. best, Colin On Thu, Dec 20, 2012 at 10:32 AM, Christoph Rupp &nb...
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Author: Colin McCabe,
2012-12-27, 20:37
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Re: Can we declare some HDFS nodes "primary" - HDFS - [mail # user]
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...It seems like those 10 nodes out of 500 would be a hot spot for writes, if there was a hard requirement that they accept all writes. This might be acceptable on a very read-focused workload,...
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Author: Colin McCabe,
2012-12-11, 23:53
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Re: Hadoop V/S Cassandra - HDFS - [mail # user]
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...On Thu, Dec 6, 2012 at 8:55 AM, yogesh dhari wrote: As Harsh commented, HDFS doesn't have a single point of failure any more. Hadoop and Cassandara are not really competito...
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Author: Colin McCabe,
2012-12-06, 19:27
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Re: How to speedup test case running? - HDFS - [mail # dev]
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...Hi, You can run a specific test with mvn eclipse -Dtest= I find that junit tests start more quickly when run within Eclipse. If you're interested, you can find instructions on se...
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Author: Colin McCabe,
2012-10-22, 18:04
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Re: MiniDFSCluster - HDFS - [mail # dev]
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...Hi Vlad, I think you might be on to something. File a JIRA? It should be a simple improvement, I think. cheers, Colin On Wed, Sep 5, 2012 at 10:42 AM, Vladimir...
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Author: Colin McCabe,
2012-09-05, 20:19
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Re: libhdfs doesn't connect to hdfs filesystem - HDFS - [mail # user]
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...Hi Mogrob, The issue arises because you either: 1. don't have the configuration XML files in your CLASSPATH when you run your libhdfs-linked program, or 2. Have configured the local fi...
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Author: Colin McCabe,
2012-08-15, 18:03
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