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[expand - 1 more] - Could not clone a snapshot, complaining the table already exist, although the table does not exist - HBase - [mail # user]
...Hi,I am trying to trying to clone a table from a snapshot, but it always failwith below error. That table does not exist, although I was trying to clonethe same table, but failed.  I fe...
   Author: Tianying Chang, 2015-06-18, 19:38
[expand - 1 more] - clone table(72TB data) failed with socket timeout - HBase - [mail # user]
...Hi,I am trying to clone a table from a snapshot. The snapshot is reported tobe healthy. However, clone table failed with socket time error, shown asbelow. BTW, the table is huge with 72T dat...
   Author: Tianying Chang, 2015-06-18, 05:15
[expand - 1 more] - What cause hfile saved under /hbase/.archive besides snapshot? - HBase - [mail # user]
...Hi,I found that there are many hfiles saved under /hbase/.archive/table/. Iknow when there is a  snapshot taken, the hfile might have to be savedunder /hbase/.archive. But when we are n...
   Author: Tianying Chang, 2015-06-05, 19:25
[expand - 7 more] - Failed to take snapshot due to some region directory is not found - HBase - [mail # user]
...Hi,We have a cluster that used to be able to take snapshot. But recently, onetable failed due to the error below. Other tables on the same clusters arefine.Any idea what could go wrong? Is t...
   Author: Tianying Chang, 2015-05-19, 06:12
[expand - 1 more] - Dump hfile to verify hbase delete order - HBase - [mail # user]
...Hi,I did a small test, want to verify that DeleteMarker is placed before anyPut of the same row/version, for example:put 't1', 'cf1', 'v1', 100delete 't1', 'cf1', 100flush 't1'But when I dum...
   Author: Tianying Chang, 2014-09-03, 18:27
[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] - WALPlayer kills many RS when play large number of WALs - HBase - [mail # user]
...HiI was running WALPlayer that output HFile for future bulkload. There are6200 hlogs, and the total size is about 400G.The mapreduce job finished. But I saw two bad things:1. More than half ...
   Author: Tianying Chang, 2014-07-22, 15:16
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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