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[expand - 1 more] - Re: Dump hfile to verify hbase delete order - HBase - [mail # user]
...Ok ,  I figured it out, when flush the memstore out to HFile, it use thescanner which masks the Put that is earlier than the delete, so the HFilewill not contain the Put.ThanksTian-Ying...
   Author: Tianying Chang, 2014-09-03, 21:14
[HBASE-11765] ReplicationSink should merge the Put/Delete of the same row into one Action even if they are from different hlog entry. - HBase - [issue]
...The current replicationSink code make sure it will only create one Put/Delete action of the kv of same row if it is from same hlog entry. However, when the same row of Put/Delete exist in di...
http://issues.apache.org/jira/browse/HBASE-11765    Author: Tianying Chang, 2014-08-17, 05:56
Hbase replication perf issue - HBase - [mail # dev]
...Hi,We are seeing some performance issue on one of our write heavy cluster, andtrying to find out the root cause. One confusion I have during investigateis that I found in ReplicationSink.jav...
   Author: Tianying Chang, 2014-08-06, 18:33
[HBASE-11684] HBase replicationSource should support multithread to ship the log entry - HBase - [issue]
...We found the replication rate cannot keep up with the write rate when the master cluster is write heavy. We got huge log queue build up due to that. But when we do a rolling restart of maste...
http://issues.apache.org/jira/browse/HBASE-11684    Author: Tianying Chang, 2014-08-06, 06:06
Hbase replication perf issue: a single region server cannot receive edits from two sources at the same time? - HBase - [mail # user]
...Hi,We are seeing some performance issue on one of our write heavy cluster, andtrying to find out the root cause. One confusion I have during investigateis that I found in ReplicationSink.jav...
   Author: Tianying Chang, 2014-08-05, 19:28
[expand - 3 more] - Re: WALPlayer kills many RS when play large number of WALs - HBase - [mail # user]
...AndrewYou are right. These are m1.xlarge instance for our hbasetest cluster. Ourproduction cluster mostly use i2 instance. I will do some math and configit accordingly to prevent these probl...
   Author: Tianying Chang, 2014-07-22, 18:33
[HBASE-10935] support snapshot policy where flush memstore can be skipped to prevent production cluster freeze - HBase - [issue]
...We are using snapshot feature to do HBase disaster recovery. We will do snapshot in our production cluster periodically. The current flush snapshot policy require all regions of the table to...
http://issues.apache.org/jira/browse/HBASE-10935    Author: Tianying Chang, 2014-07-11, 07:26
distcp2 with bandwidth throttle failed with NoSuchMethodError - Hadoop - [mail # user]
...Hi,I am using Hadoop 2.0.0-cdh4.2.0, and I copiedhadoop-distcp-2.0.3-alpha.jar under /usr/lib/hadoop folder. I can see itsupport bandwidth parameter for throttle. However, I got below error....
   Author: Tianying Chang, 2014-05-15, 16:17
using distcp v2 on mapreduce V1? - Hadoop - [mail # user]
...Hi,I am trying to use the throttle feature of distcp V2. But we are not usingYARN, we are using cdh4.2, which is MapReduce V1.  I replaced thehadoop-tool.jar to point to hadoop-distcp-2...
   Author: Tianying Chang, 2014-05-12, 03:57
[expand - 8 more] - Re: export snapshot fail sometime due to LeaseExpiredException - HBase - [mail # user]
...Hi,I found it is only that cluster I was using for my test has this issue.When I changed the destination cluster to another one, it is not a problemanymore. I still don't know what is specia...
   Author: Tianying Chang, 2014-05-01, 04:19
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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