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[HDFS-7433] DatanodeMap lookups & DatanodeID hashCodes are inefficient - HDFS - [issue]
...The datanode map is currently a TreeMap.  For many thousands of datanodes, tree lookups are ~10X more expensive than a HashMap.  Insertions and removals are up to 100X more expensi...
http://issues.apache.org/jira/browse/HDFS-7433    Author: Daryn Sharp, 2014-11-25, 15:20
[HDFS-7435] PB encoding of block reports is very inefficient - HDFS - [issue]
...Block reports are encoded as a PB repeating long.  Repeating fields use an ArrayList with default capacity of 10.  A block report containing tens or hundreds of thousand of longs (...
http://issues.apache.org/jira/browse/HDFS-7435    Author: Daryn Sharp, 2014-11-25, 14:57
[HDFS-7434] DatanodeID hashCode should not be mutable - HDFS - [issue]
...Mutable hash codes may lead to orphaned instances in a collection.  Instances must always be removed prior to modification of hash code values, and re-inserted.  Although current c...
http://issues.apache.org/jira/browse/HDFS-7434    Author: Daryn Sharp, 2014-11-24, 16:42
[HDFS-6326] WebHdfs ACL compatibility is broken - HDFS - [issue]
...2.4 ACL support is completely incompatible with <2.4 webhdfs servers.  The NN throws an IllegalArgumentException exception.hadoop fs -ls webhdfs://nn/Found 21 itemsls: Invalid value ...
http://issues.apache.org/jira/browse/HDFS-6326    Author: Daryn Sharp, 2014-11-14, 17:55
[HDFS-7213] processIncrementalBlockReport performance degradation - HDFS - [issue]
...BlockManager#processIncrementalBlockReport has a debug line that is missing a isDebugEnabled check.  The write lock is being held.  Coupled with the increase in incremental block r...
http://issues.apache.org/jira/browse/HDFS-7213    Author: Daryn Sharp, 2014-10-29, 14:19
[HDFS-6964] NN fails to fix under replication leading to data loss - HDFS - [issue]
...We've encountered lost blocks due to node failure even when there is ample time to fix the under-replication.2 nodes were lost.  The 3rd node with the last remaining replicas averaged 1...
http://issues.apache.org/jira/browse/HDFS-6964    Author: Daryn Sharp, 2014-10-21, 17:54
[HDFS-6948] DN rejects blocks if it has older UC block - HDFS - [issue]
...DNs appear to always reject blocks, even with newer genstamps, if it already has a UC copy in its tmp dir.ReplicaAlreadyExistsException: BlockXXX alreadyexists in state TEMPORARY and thus ca...
http://issues.apache.org/jira/browse/HDFS-6948    Author: Daryn Sharp, 2014-09-06, 01:32
[HDFS-7005] DFS input streams do not timeout - HDFS - [issue]
...Input streams lost their timeout.  The problem appears to be DFSClient#newConnectedPeer does not set the read timeout.  During a temporary network interruption the server will clos...
http://issues.apache.org/jira/browse/HDFS-7005    Author: Daryn Sharp, 2014-09-05, 21:18
[HDFS-6967] DNs may OOM under high webhdfs load - HDFS - [issue]
...Webhdfs uses jetty.  The size of the request thread pool is limited, but jetty will accept and queue infinite connections.  Every queued connection is "heavy" with buffers, etc. &n...
http://issues.apache.org/jira/browse/HDFS-6967    Author: Daryn Sharp, 2014-09-05, 18:11
[HDFS-5239] Allow FSNamesystem lock fairness to be configurable - HDFS - [issue]
...The fairness of the FSNamesystem#fsLock is hardcoded to true.  Using an unfair lock provides a negligible increase to throughput.  However this is due to bottlenecks elsewhere in t...
http://issues.apache.org/jira/browse/HDFS-5239    Author: Daryn Sharp, 2014-09-04, 00:41
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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