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[HDFS-7244] Reduce Namenode memory using Flyweight pattern - HDFS - [issue]
...Using the flyweight pattern can dramatically reduce memory usage in the Namenode. The pattern also abstracts the actual storage type and allows the decision of whether it is off-heap or not ...
http://issues.apache.org/jira/browse/HDFS-7244    Author: Amir Langer, 2014-11-12, 07:15
[HDFS-6552] add DN storage to a BlockInfo will not replace the different storage from same DN - HDFS - [issue]
...In BlockInfo - addStorage code looks wrong.At line 10 (below) - we remove the storage we're about to add from the list of storages, then add it. If the aim was to replace the different stora...
http://issues.apache.org/jira/browse/HDFS-6552    Author: Amir Langer, 2014-11-04, 07:13
[HDFS-6658] Namenode memory optimization - Block replicas list - HDFS - [issue]
...Part of the memory consumed by every BlockInfo object in the Namenode is a linked list of block references for every DatanodeStorageInfo (called "triplets"). We propose to change the way we ...
http://issues.apache.org/jira/browse/HDFS-6658    Author: Amir Langer, 2014-10-22, 23:35
[HDFS-7246] Use ids for DatanodeStorageInfo in the BlockInfo triplets - HDFS 6660 - HDFS - [issue]
...Identical to HDFS-6660...
http://issues.apache.org/jira/browse/HDFS-7246    Author: Amir Langer, 2014-10-22, 09:57
[HDFS-6660] Use int instead of object reference to DatanodeStorageInfo in BlockInfo triplets, - HDFS - [issue]
...Map an int index to every DatanodeStorageInfo and use it instead of object reference in the BlockInfo triplets data structure....
http://issues.apache.org/jira/browse/HDFS-6660    Author: Amir Langer, 2014-10-22, 09:57
[HDFS-7250] Store blocks in slabs rather than a Map inside BlocksMap - HDFS - [issue]
...Key to every block is the replication factor + slab key (address).When setting a different replication factor for a block we need to move its data from one slab to another....
http://issues.apache.org/jira/browse/HDFS-7250    Author: Amir Langer, 2014-10-14, 12:43
[HDFS-7249] Define block slabs per replication factor and initialise them in advance (inc. size config) - HDFS - [issue]
...The plan is to create a slab per replication factor inside the BlocksMap....
http://issues.apache.org/jira/browse/HDFS-7249    Author: Amir Langer, 2014-10-14, 12:42
[HDFS-7248] Use ids for blocks in InodeFile - HDFS - [issue]
...Getting access to a block will be via lookup in the BlocksMap by id....
http://issues.apache.org/jira/browse/HDFS-7248    Author: Amir Langer, 2014-10-14, 12:41
[HDFS-7247] Use ids for Block collection in Block - HDFS - [issue]
...Getting the BlockCollection will be done via lookup by Id....
http://issues.apache.org/jira/browse/HDFS-7247    Author: Amir Langer, 2014-10-14, 12:40
[HDFS-6659] Create a Block List - HDFS - [issue]
...BlockList - An efficient array based list that can extend its capacity with two main features:1. Gaps (result of remove operations) are managed internally without the need for extra memory -...
http://issues.apache.org/jira/browse/HDFS-6659    Author: Amir Langer, 2014-09-04, 15:21
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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