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[HDFS-4461] DirectoryScanner: volume path prefix takes up memory for every block that is scanned - HDFS - [issue]
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...In the DirectoryScanner, we create a class ScanInfo for every block. This object contains two File objects-- one for the metadata file, and one for the block file. Since those Fi...
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http://issues.apache.org/jira/browse/HDFS-4461
Author: Colin Patrick McCabe,
2013-06-20, 01:37
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[HDFS-4521] invalid network toploogies should not be cached - HDFS - [issue]
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...When the network topology is invalid, the DataNode refuses to start with a message such as this:org.apache.hadoop.hdfs.server.protocol.DatanodeProtocol.registerDatanode from 172.29.122.23:55...
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http://issues.apache.org/jira/browse/HDFS-4521
Author: Colin Patrick McCabe,
2013-06-19, 12:22
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[HDFS-4911] Reduce PeerCache timeout to be commensurate with dfs.datanode.socket.reuse.keepalive - HDFS - [issue]
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...The default timeout for the client's PeerCache is much longer than the DataNode would possibly keep the socket open. Specifically, dfs.client.socketcache.expiryMsec defaults to 2 *60 *...
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http://issues.apache.org/jira/browse/HDFS-4911
Author: Colin Patrick McCabe,
2013-06-17, 19:12
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[HDFS-4870] periodically re-resolve hostnames in included and excluded datanodes list - HDFS - [issue]
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...We currently only resolve the hostnames in the included and excluded datanodes list once-- when the list is read. The rationale for this is that in big clusters, DNS resolution for tho...
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http://issues.apache.org/jira/browse/HDFS-4870
Author: Colin Patrick McCabe,
2013-06-03, 20:58
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[HDFS-4504] DFSOutputStream#close doesn't always release resources (such as leases) - HDFS - [issue]
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...DFSOutputStream#close can throw an IOException in some cases. One example is if there is a pipeline error and then pipeline recovery fails. Unfortunately, in this case, some of t...
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http://issues.apache.org/jira/browse/HDFS-4504
Author: Colin Patrick McCabe,
2013-05-29, 21:21
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[HDFS-4160] libhdfs / fuse-dfs should implement O_CREAT | O_EXCL - HDFS - [issue]
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...hdfsOpenFile contains this code:if ((flags & O_CREAT) && (flags & O_EXCL)) { ...
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http://issues.apache.org/jira/browse/HDFS-4160
Author: Colin Patrick McCabe,
2013-05-29, 19:45
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[HDFS-4864] fuse_dfs's rename can't rename over a file - HDFS - [issue]
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...fuse_dfs's rename can't rename over a file, which causes a lot of stuff to not work, including rsync. It should be simple enough for libhdfs to provide a method that calls FileSystem#r...
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http://issues.apache.org/jira/browse/HDFS-4864
Author: Colin Patrick McCabe,
2013-05-29, 19:28
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[HDFS-4817] make HDFS advisory caching configurable on a per-file basis - HDFS - [issue]
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...HADOOP-7753 and related JIRAs introduced some performance optimizations for the DataNode. One of them was readahead. When readahead is enabled, the DataNode starts reading the ne...
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http://issues.apache.org/jira/browse/HDFS-4817
Author: Colin Patrick McCabe,
2013-05-28, 18:32
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[HDFS-4698] provide client-side metrics for remote reads, local reads, and short-circuit reads - HDFS - [issue]
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...We should provide metrics to let clients know how many bytes of data they have read remotely, versus locally or via short-circuit local reads. This will allow clients to know how well ...
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http://issues.apache.org/jira/browse/HDFS-4698
Author: Colin Patrick McCabe,
2013-05-25, 16:06
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[HDFS-4839] add NativeIO#mkdirs, that provides an error message on failure - HDFS - [issue]
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...It would be nice to have a variant of mkdirs that provided an error message explaining why it failed. This would make it easier to debug certain failing unit tests that rely on mkdir /...
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http://issues.apache.org/jira/browse/HDFS-4839
Author: Colin Patrick McCabe,
2013-05-22, 04:05
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