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[HBASE-7887] Support configuring KeyValue Comparator at table level - HBase - [issue]
...Now, KeyValue Comparator is static by code in HRegionInfo  public KVComparator getComparator() {    return isRootRegion()? KeyValue.ROOT_COMPARATOR: isMetaRegion()?&...
http://issues.apache.org/jira/browse/HBASE-7887    Author: chunhui shen, 2013-02-21, 03:47
[HBASE-7506] Judgment of carrying ROOT/META will become wrong when expiring server - HBase - [issue]
...We will check whether server carrying ROOT/META when expiring the server.See ServerManager#expireServer.If the dead server carrying META, we assign meta directly in the process of ServerShut...
http://issues.apache.org/jira/browse/HBASE-7506    Author: chunhui shen, 2013-02-05, 03:58
[HBASE-6335] Switching log-splitting policy after last failure master start may cause data loss - HBase - [issue]
...How happen?If server A is down, and it has three log files, all the data is from one region.File 1: kv01 kv02 kv03File 2: kv04 kv05 kv06File 3: kv07 kv08 kv09Here,kv01 means, its log seqID i...
http://issues.apache.org/jira/browse/HBASE-6335    Author: chunhui shen, 2013-01-28, 05:33
[HBASE-7672] Merging compaction requests in the queue for same store - HBase - [issue]
...With a high write presesure, we could found many compaction requests for same store in the compaction queue.I think we could merge compaction requests for same store to increase compaction e...
http://issues.apache.org/jira/browse/HBASE-7672    Author: chunhui shen, 2013-01-26, 03:56
[HBASE-5422] StartupBulkAssigner would cause a lot of timeout on RIT when assigning large numbers of regions (timeout = 3 mins) - HBase - [issue]
...In our produce environmentWe find a lot of timeout on RIT when cluster up, there are about 7w regions in the cluster( 25 regionservers ).First, we could see the following log:(See the region...
http://issues.apache.org/jira/browse/HBASE-5422    Author: chunhui shen, 2012-11-19, 20:04
[HBASE-7136] SchemaMetrics make SlabCache unavailable - HBase - [issue]
...ERROR org.apache.hadoop.hbase.regionserver.HRegionServer:java.lang.IllegalStateException: Schema metrics requested before table/CF name initialization: {"tableName":"null","cfName":"null"}at...
http://issues.apache.org/jira/browse/HBASE-7136    Author: chunhui shen, 2012-11-09, 02:57
[HBASE-5970] Improve the AssignmentManager#updateTimer and speed up handling opened event - HBase - [issue]
...We found handing opened event very slow in the environment with lots of regions.The problem is the slow AssignmentManager#updateTimer.We do the test for bulk assigning 10w (i.e. 100k) region...
http://issues.apache.org/jira/browse/HBASE-5970    Author: chunhui shen, 2012-11-05, 02:55
[HBASE-7070] Scanner may retry forever  after HBASE-5974 - HBase - [issue]
...After the patch of HBASE-5974Suppose The process is as the following:1.A next request is very large, so first time it is failed because of timeout2.The second time it is failed again because...
http://issues.apache.org/jira/browse/HBASE-7070    Author: chunhui shen, 2012-11-04, 17:31
[HBASE-5179] Concurrent processing of processFaileOver and ServerShutdownHandler may cause region to be assigned before log splitting is completed, causing data loss - HBase - [issue]
...If master's processing its failover and ServerShutdownHandler's processing happen concurrently, it may appear following  case.1.master completed splitLogAfterStartup()2.RegionserverA re...
http://issues.apache.org/jira/browse/HBASE-5179    Author: chunhui shen, 2012-10-25, 17:46
[HBASE-6839] Operations may be executed without holding rowLock - HBase - [issue]
...HRegion#internalObtainRowLock will return null if timed out,but many place which call this method don't handle this caseThe bad result is operation will be executed even if it havn't obtaine...
http://issues.apache.org/jira/browse/HBASE-6839    Author: chunhui shen, 2012-10-24, 06:40
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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