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[HDFS-4403] DFSClient can infer checksum type when not provided by reading first byte - HDFS - [issue]
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...HDFS-3177 added the checksum type to OpBlockChecksumResponseProto, but the new protobuf field is optional, with a default of CRC32. This means that this API, when used against an older clust...
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http://issues.apache.org/jira/browse/HDFS-4403
Author: Todd Lipcon,
2013-01-22, 14:04
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[HDFS-4418] HDFS-347: increase default FileInputStreamCache size - HDFS - [issue]
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...The FileInputStreamCache currently defaults to holding only 10 input stream pairs (corresponding to 10 blocks). In many HBase workloads, the region server will be issuing random reads agains...
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http://issues.apache.org/jira/browse/HDFS-4418
Author: Todd Lipcon,
2013-01-17, 23:11
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[HDFS-3429] DataNode reads checksums even if client does not need them - HDFS - [issue]
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...Currently, even if the client does not want to verify checksums, the datanode reads them anyway and sends them over the wire. This means that performance improvements like HBase's applicatio...
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http://issues.apache.org/jira/browse/HDFS-3429
Author: Todd Lipcon,
2013-01-15, 13:20
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[HDFS-3677] dfs.namenode.edits.dir.required missing from hdfs-default.xml - HDFS - [issue]
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...This config should be documented. It's useful for cases where the user would like to ensure that (eg) an NFS filer always has the most up-to-date edits....
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http://issues.apache.org/jira/browse/HDFS-3677
Author: Todd Lipcon,
2012-12-28, 03:49
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[HDFS-4324] Track and report out-of-date blocks separately from corrupt blocks - HDFS - [issue]
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...Currently in various places (metrics, dfsadmin -report, fsck, logs) we use the term "corrupt" to refer to blocks which have an out-of-date generation stamp. Since out-of-date blocks are a fa...
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http://issues.apache.org/jira/browse/HDFS-4324
Author: Todd Lipcon,
2012-12-19, 22:31
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[HDFS-3571] Allow EditLogFileInputStream to read from a remote URL - HDFS - [issue]
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...In order to start up from remote edits storage (like the JournalNodes of HDFS-3077), the NN needs to be able to load edits from a URL, instead of just local disk. This JIRA extends EditLogFi...
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http://issues.apache.org/jira/browse/HDFS-3571
Author: Todd Lipcon,
2012-12-11, 19:45
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[HDFS-2525] Race between BlockPoolSliceScanner and append - HDFS - [issue]
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...I wrote a test which runs append() in a loop on a single file with a single replica, appending 0~100 bytes each time. If this races with the BlockPoolSliceScanner, I observe the BlockPoolSli...
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http://issues.apache.org/jira/browse/HDFS-2525
Author: Todd Lipcon,
2012-12-10, 22:28
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[HDFS-3626] Creating file with invalid path can corrupt edit log - HDFS - [issue]
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...Joris Bontje reports the following:The following command results in a corrupt NN editlog (note the double slash and reading from stdin):$ cat /usr/share/dict/words | hadoop fs -put - hdfs://...
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http://issues.apache.org/jira/browse/HDFS-3626
Author: Todd Lipcon,
2012-12-04, 19:40
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Re: profiling hdfs write path - HDFS - [mail # dev]
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...On Tue, Dec 4, 2012 at 9:07 AM, Radim Kolar wrote: If you're just going to insult us, please stay away. We don't need your help unless you're going to be constructive. Todd...
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Author: Todd Lipcon,
2012-12-04, 17:27
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Re: profiling hdfs write path - HDFS - [mail # dev]
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...Hi Radim, My work-in-progress branch is online here: https://github.com/toddlipcon/hadoop-common/commits/trunk-write-pipeline-fast It is definitely buggy, it might not actually b...
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Author: Todd Lipcon,
2012-11-29, 18:25
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