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[HBASE-8755] A new write thread model for HLog to improve the overall HBase write throughput - HBase - [issue]
...In current write model, each write handler thread (executing put()) will individually go through a full 'append (hlog local buffer) => HLog writer append (write to hdfs) => HLog writer...
http://issues.apache.org/jira/browse/HBASE-8755    Author: Feng Honghua, 2014-01-26, 07:58
[HBASE-7226] HRegion.checkAndMutate uses incorrect comparison result for <, <=, > and >= - HBase - [issue]
...in HRegion.checkAndMutate, incorrect comparison results are used for <, <=, > and >=, as below:          switch (compareOp) {     &nb...
http://issues.apache.org/jira/browse/HBASE-7226    Author: Feng Honghua, 2014-01-21, 01:31
[HBASE-10273] AssignmentManager.regions and AssignmentManager.servers are not always updated in tandem - HBase - [issue]
...By definition, AssignmentManager.servers and AssignmentManager.regions are tied and should be updated in tandem with each other under a lock on AssignmentManager.regions, but there are two p...
http://issues.apache.org/jira/browse/HBASE-10273    Author: Feng Honghua, 2014-01-21, 01:31
[HBASE-10344] Improve write performance by ignoring sync to hdfs when an asyncer's writes have been synced by other asyncer - HBase - [issue]
...By fixing HBASE-10329, we know it's possible an asyncer's writes could have been synced by other asyncer before it starts to do the sync. We distinguish this case and handle accordingly when...
http://issues.apache.org/jira/browse/HBASE-10344    Author: Feng Honghua, 2014-01-16, 01:35
[HBASE-10329] Fail the writes rather than proceeding silently to prevent data loss when AsyncSyncer encounters null writer and its writes aren't synced by other Asyncer - HBase - [issue]
...Last month after I introduced multiple AsyncSyncer threads to improve the throughput for lower number client write threads, stack encountered a NPE while doing the test where null-writer occ...
http://issues.apache.org/jira/browse/HBASE-10329    Author: Feng Honghua, 2014-01-15, 07:05
[HBASE-10324] refactor deferred-log-flush/Durability related interface/code/naming to align with changed semantic of the new write thread model - HBase - [issue]
...By the new write thread model introduced by HBASE-8755, some deferred-log-flush/Durability API/code/names should be change accordingly:1. no timer-triggered deferred-log-flush since flush is...
http://issues.apache.org/jira/browse/HBASE-10324    Author: Feng Honghua, 2014-01-15, 01:02
[HBASE-10227] When a region is opened, its mvcc isn't correctly recovered when there are split hlogs to replay - HBase - [issue]
...When opening a region, all stores are examined to get the max MemstoreTS and it's used as the initial mvcc for the region, and then split hlogs are replayed. In fact the edits in split hlogs...
http://issues.apache.org/jira/browse/HBASE-10227    Author: Feng Honghua, 2014-01-14, 21:28
[HBASE-10263] make LruBlockCache single/multi/in-memory ratio user-configurable and provide preemptive mode for in-memory type block - HBase - [issue]
...currently the single/multi/in-memory ratio in LruBlockCache is hardcoded 1:2:1, which can lead to somewhat counter-intuition behavior for some user scenario where in-memory table's read perf...
http://issues.apache.org/jira/browse/HBASE-10263    Author: Feng Honghua, 2014-01-13, 02:07
[HBASE-10280] Make inMemoryForceMode of LruBlockCache configurable per column-family - HBase - [issue]
...An extension of HBASE-10263 per Ted Yu's suggestion.brief description of this extension is as below:1. if the global inMemoryForceMode is on, all in-memory blocks are preemptive no matter wh...
http://issues.apache.org/jira/browse/HBASE-10280    Author: Feng Honghua, 2014-01-04, 03:17
[HBASE-8721] Deletes can mask puts that happen after the delete - HBase - [issue]
...this fix aims for bug mentioned in http://hbase.apache.org/book.html"Deletes mask puts, even puts that happened after the delete was entered. Remember that a delete writes a tombsto...
http://issues.apache.org/jira/browse/HBASE-8721    Author: Feng Honghua, 2014-01-02, 18:21
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