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[HDFS-2014] bin/hdfs no longer works from a source checkout - HDFS - [issue]
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...bin/hdfs now appears to depend on ../libexec, which doesn't exist inside of a source checkout:todd@todd-w510:~/git/hadoop-hdfs$ ./bin/hdfs namenode./bin/hdfs: line 22: /home/todd/git/hadoop-...
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http://issues.apache.org/jira/browse/HDFS-2014
Author: Todd Lipcon,
2012-11-29, 09:11
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[HDFS-4169] Add per-disk latency metrics to DataNode - HDFS - [issue]
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...Currently, if one of the drives on the DataNode is slow, it's hard to determine what the issue is. This can happen due to a failing disk, bad controller, etc. It would be preferable to expos...
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http://issues.apache.org/jira/browse/HDFS-4169
Author: Todd Lipcon,
2012-11-29, 03:34
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[HDFS-3529] Use direct buffers for data in write path - HDFS - [issue]
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...The write path currently makes several unnecessary data copies in order to go to and from byte arrays. We can improve performance by using direct byte buffers to avoid the copy. This is also...
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http://issues.apache.org/jira/browse/HDFS-3529
Author: Todd Lipcon,
2012-11-26, 17:52
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[HDFS-3528] Use native CRC32 in DFS write path - HDFS - [issue]
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...HDFS-2080 improved the CPU efficiency of the read path by using native SSE-enabled code for CRC verification. Benchmarks of the write path show that it's often CPU bound by checksums as well...
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http://issues.apache.org/jira/browse/HDFS-3528
Author: Todd Lipcon,
2012-11-26, 17:52
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Re: murmur3 instead of crc32 - HDFS - [mail # dev]
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...Hi Radim, With SSE4.2 support, the iSCSI CRC32C is the fastest method available. As of HDFS 2, we use that method by default for new files. -Todd On Sun, Nov 25, 2012 at 6:...
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Author: Todd Lipcon,
2012-11-26, 03:38
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Re: profiling hdfs write path - HDFS - [mail # dev]
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...Hi Radim, Currently it's CPU-intensive for several reasons: 1) It doesn't yet use the native CRC code 2) It makes several unnecessary copies and byte buffer allocations, both in the cl...
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Author: Todd Lipcon,
2012-11-26, 01:35
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Re: HDFS append on upgraded cluster - HDFS - [mail # dev]
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...Hi Vinayakumar, If you append to a block which has hard-links, then it will get copied on write at the DataNode. See this code: /** * Make a copy of the block...
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Author: Todd Lipcon,
2012-11-19, 19:10
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Re: 答复: What is the reason that DataNode should configured the http and streamer port with a number under 1024 in secure mode? - HDFS - [mail # dev]
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...On Sun, Nov 18, 2012 at 8:28 PM, Xiaohan wrote: The DN->NN RPCs come in on a different port and different IPC interface than the client RPCs. The DN->NN RPC only allows a ...
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Author: Todd Lipcon,
2012-11-19, 18:01
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[HDFS-528] Add ability for safemode to wait for a minimum number of live datanodes - HDFS - [issue]
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...When starting up a fresh cluster programatically, users often want to wait until DFS is "writable" before continuing in a script. "dfsadmin -safemode wait" doesn't quite work for this on a c...
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http://issues.apache.org/jira/browse/HDFS-528
Author: Todd Lipcon,
2012-11-19, 06:53
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[HDFS-4202] Some usage of GetConf tool not compatible with federation - HDFS - [issue]
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...In the start/stop scripts, we use the "getconf" tool to look up certain config keys to discover hosts we need to start/stop daemons on. However, some of these configs are optionally suffixed...
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http://issues.apache.org/jira/browse/HDFS-4202
Author: Todd Lipcon,
2012-11-16, 21:48
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