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[HDFS-7325] Prevent thundering herd problem in ByteArrayManager by using notify not notifyAll - HDFS - [issue]
...Currently ByteArrayManager wakes all waiting threads whenever a byte array is released and count == limit.  However, only one thread can proceed.    With a large number of wai...
http://issues.apache.org/jira/browse/HDFS-7325    Author: Colin Patrick McCabe, 2014-11-05, 19:17
[HDFS-7278] Add a command that allows sysadmins to manually trigger full block reports from a DN - HDFS - [issue]
...We should add a command that allows sysadmins to manually trigger full block reports from a DN....
http://issues.apache.org/jira/browse/HDFS-7278    Author: Colin Patrick McCabe, 2014-10-31, 17:34
[HDFS-7227] Fix findbugs warning about NP_DEREFERENCE_OF_READLINE_VALUE in SpanReceiverHost - HDFS - [issue]
...Fix findbugs warning about NP_DEREFERENCE_OF_READLINE_VALUE in SpanReceiverHost...
http://issues.apache.org/jira/browse/HDFS-7227    Author: Colin Patrick McCabe, 2014-10-19, 12:31
[HDFS-7185] The active NameNode will not accept an fsimage sent from the standby during rolling upgrade - HDFS - [issue]
...The active NameNode will not accept an fsimage sent from the standby during rolling upgrade.  The active fails with the exception:18:25:07,620  WARN ImageServlet:198 - Received an ...
http://issues.apache.org/jira/browse/HDFS-7185    Author: Colin Patrick McCabe, 2014-10-16, 14:59
[HDFS-6036] Forcibly timeout misbehaving DFSClients that try to do no-checksum reads that extend too long - HDFS - [issue]
...We should forcibly timeout misbehaving DFSClients that try to do no-checksum reads that extend too long....
http://issues.apache.org/jira/browse/HDFS-6036    Author: Colin Patrick McCabe, 2014-09-04, 03:55
[HDFS-6993] Add a metric for the number of misbehaving DFSClients that try to do no-checksum reads that extend too long - HDFS - [issue]
...Add a metric on the DataNode for the number of misbehaving DFSClients that try to do no-checksum reads that extend too long....
http://issues.apache.org/jira/browse/HDFS-6993    Author: Colin Patrick McCabe, 2014-09-04, 03:21
[HDFS-6867] For DFSOutputStream, do pipeline recovery for a single block in the background - HDFS - [issue]
...For DFSOutputStream, we should be able to do pipeline recovery in the background, while the user is continuing to write to the file.  This is especially useful for long-lived clients th...
http://issues.apache.org/jira/browse/HDFS-6867    Author: Colin Patrick McCabe, 2014-09-03, 21:50
[HDFS-6956] Allow dynamically changing the tracing level in Hadoop servers - HDFS - [issue]
...We should allow users to dynamically change the tracing level in Hadoop servers.  The easiest way to do this is probably to have an RPC accessible only to the superuser that changes tra...
http://issues.apache.org/jira/browse/HDFS-6956    Author: Colin Patrick McCabe, 2014-09-03, 00:37
[HDFS-6985] Add final keywords, documentation, etc. to ReplaceDatanodeOnFailure - HDFS - [issue]
...use final qualifier and variable names consistently in ReplaceDatanodeOnFailure#Condition classes add a debug log message in the DFSClient explaining which pipeline failure policy is being u...
http://issues.apache.org/jira/browse/HDFS-6985    Author: Colin Patrick McCabe, 2014-09-02, 23:46
[HDFS-6800] Support Datanode layout changes with rolling upgrade - HDFS - [issue]
...We need to handle attempts to rolling-upgrade the DataNode to a new storage directory layout.One approach is to disallow such upgrades.  If we choose this approach, we should make sure ...
http://issues.apache.org/jira/browse/HDFS-6800    Author: Colin Patrick McCabe, 2014-09-01, 22:44
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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