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答复: Topology script frequency - HDFS - [mail # user]
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...I'd submitted a patch(HADOOP-8928.txt) to reload topology config dynamically like "hdfs dfsadmin -refreshTopology" style several months before, see HADOOP-8928 for more details. Regard...
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Author: 谢良,
2013-02-21, 02:26
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答复: 答复: 答复: some ideas for QJM and NFS - HDFS - [mail # user]
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...But it'll contend for I/O resources. when journal(...) is invoked in JN, there will be a flush(shouldFsync) operation, relying on Java's FileChannel.force(...) method, then turn into a f(dat...
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Author: 谢良,
2013-02-18, 08:39
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答复: 答复: some ideas for QJM and NFS - HDFS - [mail # user]
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...IMHO, it's not a recommented deploy manner to deploy JN and DN into same nodes. Regards, Liang ________________________________ 发件人: Azuryy Yu [[EMAIL PROTECTED]] 发送时间: 2013年2月18日 15:5...
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Author: 谢良,
2013-02-18, 08:02
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答复: some ideas for QJM and NFS - HDFS - [mail # user]
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...Hi Azuryy, just want to confirm one thing, your JN did not deploy on the same machines within DN, right ? Regards, Liang ________________________________ 发件人: Azuryy Yu [[EMAIL PROTECT...
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Author: 谢良,
2013-02-18, 07:35
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答复: why my test result on dfs short circuit read is slower? - HDFS - [mail # user]
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...Probably readahead played a key role on the first scenario(scan only job) ? the default LONG_READ_THRESHOLD_BYTES(BlockSender.java) is 256k in current codebase, and ReadaheadPool takes...
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Author: 谢良,
2013-02-18, 06:59
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How to speedup test case running? - HDFS - [mail # dev]
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...Hi devs, are there any tips or parameters to pass to "mvn test" to make the running more aggressively? it costs me almost two hours for a "mvn test" run under "haddop-hdfs" direc...
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Author: 谢良,
2012-10-22, 02:00
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