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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-7341] Add initial snapshot support based on pipeline recovery - HDFS - [issue]
...Add initial snapshot support based on pipeline recovery.  This iteration does not support snapshots or rollback.  This support will be added in the HDFS-3107 branch by later subtas...
http://issues.apache.org/jira/browse/HDFS-7341    Author: Colin Patrick McCabe, 2014-11-04, 02:32
[HDFS-6917] Add an hdfs debug command to validate blocks, call recoverlease, etc. - HDFS - [issue]
...HDFS should have a debug command which could validate HDFS block files, call recoverLease, and have some other functionality.  These commands would be purely for debugging and would app...
http://issues.apache.org/jira/browse/HDFS-6917    Author: Colin Patrick McCabe, 2014-11-03, 19:13
[HDFS-7326] Add documentation for hdfs debug commands - HDFS - [issue]
...We should add documentation for hdfs debug commands....
http://issues.apache.org/jira/browse/HDFS-7326    Author: Colin Patrick McCabe, 2014-11-03, 19:13
[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-6984] In Hadoop 3, make FileStatus no longer a Writable - HDFS - [issue]
...FileStatus was a Writable in Hadoop 2 and earlier.  Originally, we used this to serialize it and send it over the wire.  But in Hadoop 2 and later, we have the protobuf HdfsFileSta...
http://issues.apache.org/jira/browse/HDFS-6984    Author: Colin Patrick McCabe, 2014-09-05, 20:11
[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
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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