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Issues on disabling compaction in HBase 0.94.2 - HBase - [mail # user]
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...Hi, I want to disable automatic compaction in HBase. Currently I used following configurations in conf/hbase-site.xml The problem is compaction does not really be disable. As write are issue...
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Author: yun peng,
2012-11-22, 23:50
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Re: How to check if a major_compact is done? - HBase - [mail # user]
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...Hi, as I recently find out, by spinning on getStorefiles = task.getStores() may not be a robust method to check if a compaction is done. For instance, if the interval for checking is s...
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Author: yun peng,
2012-11-17, 01:03
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How to monitor total disk access in HBase? - HBase - [mail # user]
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...Hi, I want to profile the # of disk access (both random and sequential) issued from HBase (into HDFS). For disk reads, I have tried use blockCacheMissCount, which seems working. But is it th...
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Author: yun peng,
2012-11-10, 15:03
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Re: How to check if a major_compact is done? - HBase - [mail # user]
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...Hi, I have fixed the problem. I found the MBeanServerConnection.getAttribute(ObjectName name, String attribute) is the one useful here. Thanks to all. Yun On Thu, Nov 8, 2012 at 3:58 P...
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Author: yun peng,
2012-11-08, 21:08
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Re: How to check if a major_compact is done? - HBase - [mail # user]
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...Hi, Mikael and Jeremy, thanks for your detailed answers. I have tried the MBean code as an attempt. I get certain information out from the printout, like follows, ... javax.management.MBeanA...
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Author: yun peng,
2012-11-08, 20:58
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Re: How to check if a major_compact is done? - HBase - [mail # user]
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...Yes, JMX exposes compaction time. My cluster has JMX enabled, and I can view certain statistics from remote jconsole. However, I dont find any reference talking about how to write a Ja...
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Author: yun peng,
2012-11-08, 18:31
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How to check if a major_compact is done? - HBase - [mail # user]
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...Hi, All, I want to measure the duration of a major compaction in HBase. Since the function call majorCompact is asynchronous, I may need to manually check when the major compaction is done. ...
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Author: yun peng,
2012-11-08, 06:08
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Re: What could cause HBase's writes slower than reads? - HBase - [mail # user]
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...Yes Mohit, that's the cause! HBase is read values not present in datatable, which leads to very fast read performance. When I change it to reading valid values in data table, it is back to n...
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Author: yun peng,
2012-11-04, 15:08
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Re: What could cause HBase's writes slower than reads? - HBase - [mail # user]
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...Hi, the throughput for write-only workload is 450 ops/sec and for read-only 900 ops/sec. I am using the same machine (1-core CPU, 2G mem) for client to drive workload into hbase/hdfs... one ...
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Author: yun peng,
2012-11-03, 14:09
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What could cause HBase's writes slower than reads? - HBase - [mail # user]
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...Hi, All, In my HBase cluster, I observed Put() executes faster than a Get(). Since HBase is optimized towards write, I wonder what may affect Put performance in a distributed setting below. ...
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Author: yun peng,
2012-11-03, 04:07
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