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[HDFS-6695] Investigate using Java 7's nonblocking file I/O in BlockReaderLocal to implement read timeouts - HDFS - [issue]
...In BlockReaderLocal, the "read" system call could block for a long time if the disk drive is having problems, or there is a huge amount of I/O contention.  This might cause poor latency...
http://issues.apache.org/jira/browse/HDFS-6695    Author: Colin Patrick McCabe, 2014-07-17, 19:20
[HDFS-5202] Support Centralized Cache Management on Windows. - HDFS - [issue]
...HDFS caching currently is implemented using POSIX syscalls for checking ulimit and locking pages of memory into the process's address space.  These POSIX syscalls do not exist on Window...
http://issues.apache.org/jira/browse/HDFS-5202    Author: Colin Patrick McCabe, 2014-07-11, 14:56
[HDFS-5049] Add JNI mlock support - HDFS - [issue]
...Add support for mlock and munlock, for use in caching....
http://issues.apache.org/jira/browse/HDFS-5049    Author: Colin Patrick McCabe, 2014-07-10, 20:12
[HDFS-4504] DFSOutputStream#close doesn't always release resources (such as leases) - HDFS - [issue]
...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...
http://issues.apache.org/jira/browse/HDFS-4504    Author: Colin Patrick McCabe, 2014-07-10, 01:21
[HDFS-5546] race condition crashes "hadoop ls -R" when directories are moved/removed - HDFS - [issue]
...This seems to be a rare race condition where we have a sequence of events like this:1. org.apache.hadoop.shell.Ls calls DFS#getFileStatus on directory D.2. someone deletes or moves directory...
http://issues.apache.org/jira/browse/HDFS-5546    Author: Colin Patrick McCabe, 2014-06-25, 20:40
[HDFS-6497] Make TestAvailableSpaceVolumeChoosingPolicy deterministic - HDFS - [issue]
...We should make TestAvailableSpaceVolumeChoosingPolicy deterministic to avoid random failures.  We can do this by setting the seed for the random number generator explicitly in the test....
http://issues.apache.org/jira/browse/HDFS-6497    Author: Colin Patrick McCabe, 2014-06-07, 16:15
[HDFS-4864] fuse_dfs's rename can't rename over a file - HDFS - [issue]
...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...
http://issues.apache.org/jira/browse/HDFS-4864    Author: Colin Patrick McCabe, 2014-05-30, 16:27
[HDFS-6287] Add vecsum test of libhdfs read access times - HDFS - [issue]
...Add vecsum, a benchmark that tests libhdfs access times.  This includes short-circuit, zero-copy, and standard libhdfs access modes.  It also has a local filesystem mode for compar...
http://issues.apache.org/jira/browse/HDFS-6287    Author: Colin Patrick McCabe, 2014-05-20, 16:37
[HDFS-6355] Fix divide-by-zero, improper use of wall-clock time in BlockPoolSliceScanner - HDFS - [issue]
...BlockPoolSliceScanner uses Time.now to calculate an interval.  But this is incorrect, since if the wall-clock time changes, we will end up setting the scan periods to a shorter or longe...
http://issues.apache.org/jira/browse/HDFS-6355    Author: Colin Patrick McCabe, 2014-05-15, 19:20
[HDFS-6294] Use INode IDs to avoid conflicts when a file open for write is renamed - HDFS - [issue]
...Now that we have a unique INode ID for each INode, clients with files that are open for write can use this unique ID rather than a file path when they are requesting more blocks or closing t...
http://issues.apache.org/jira/browse/HDFS-6294    Author: Colin Patrick McCabe, 2014-05-12, 19:27
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB