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[HDFS-7373] Clean up temporary files after fsimage transfer failures - HDFS - [issue]
...When a fsimage (e.g. checkpoint) transfer fails, a temporary file is left in each storage directory.  If the size of name space is large, these files can take up quite a bit of space....
http://issues.apache.org/jira/browse/HDFS-7373    Author: Kihwal Lee, 2015-08-01, 00:59
[HDFS-8722] Optimize datanode writes for small writes and flushes - HDFS - [issue]
...After the data corruption fix by HDFS-4660, the CRC recalculation for partial chunk is executed more frequently, if the client repeats writing few bytes and calling hflush/hsync.  This ...
http://issues.apache.org/jira/browse/HDFS-8722    Author: Kihwal Lee, 2015-07-15, 16:51
[HDFS-5498] Improve datanode startup time - HDFS - [issue]
...Similarly to HDFS-5027, an improvement  can be made for getVomeMap(). This is the phase in which ReplicaMap.is populated.  But it will be even better if datanode scans only once an...
http://issues.apache.org/jira/browse/HDFS-5498    Author: Kihwal Lee, 2015-07-02, 10:16
[HDFS-8068] Do not retry rpc calls If the proxy contains unresolved address - HDFS - [issue]
...When the InetSocketAddress object happens to be unresolvable (e.g. due to transient DNS issue), the rpc proxy object will not be usable since the client will throw UnknownHostException when ...
http://issues.apache.org/jira/browse/HDFS-8068    Author: Kihwal Lee, 2015-06-26, 23:07
[HDFS-8611] Improve the performance of retry cache eviction - HDFS - [issue]
...As discussed in HDFS-7609, removing expired entry from retry cache can be costly.  Following is the comment left by Tsz Wo Nicholas Sze in HDFS-7609.PriorityQueue#remove is O(n), so...
http://issues.apache.org/jira/browse/HDFS-8611    Author: Kihwal Lee, 2015-06-17, 02:54
[HDFS-6663] Admin command to track file and locations from block id - HDFS - [issue]
...A dfsadmin command that allows finding out the file and the locations given a block number will be very useful in debugging production issues.   It may be possible to add this feature t...
http://issues.apache.org/jira/browse/HDFS-6663    Author: Kihwal Lee, 2015-06-16, 18:17
[HDFS-8547] The space reservation for RBW block is leaking - HDFS - [issue]
...HDFS-6898 added the feature to reserve space on datanode when creating RBW replicas.  We have noticed that nonDfsUsed increasing on some of the datanodes. Heap dump of datanodes has rev...
http://issues.apache.org/jira/browse/HDFS-8547    Author: Kihwal Lee, 2015-06-15, 16:41
[HDFS-5138] Support HDFS upgrade in HA - HDFS - [issue]
...With HA enabled, NN wo't start with "-upgrade". Since there has been a layout version change between 2.0.x and 2.1.x, starting NN in upgrade mode was necessary when deploying 2.1.x to an exi...
http://issues.apache.org/jira/browse/HDFS-5138    Author: Kihwal Lee, 2015-05-22, 20:01
[HDFS-4185] Add a metric for number of active leases - HDFS - [issue]
...We have seen cases of systematic open file leaks, which could have been detected if we have a metric that shows number of active leases....
http://issues.apache.org/jira/browse/HDFS-4185    Author: Kihwal Lee, 2015-05-19, 16:33
[HDFS-6888] Allow selectively audit logging ops - HDFS - [issue]
...The audit logging of getFileInfo() was added in HDFS-3733.  Since this is a one of the most called method, users have noticed that audit log is now filled with this.  Since we now ...
http://issues.apache.org/jira/browse/HDFS-6888    Author: Kihwal Lee, 2015-05-15, 17:09
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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