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Showing posts with label analysis. Show all posts
Showing posts with label analysis. Show all posts
Friday, July 31, 2015

Attempting to understand java garbage collect statistics

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If you have been develop large java application, at times troubleshooting application can go as deep as looking into garbage collector when...
Sunday, May 10, 2015

My journey and experience on upgrading apache cassandra from version1.0.12 to 1.1.12

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If you have read my previous post on apache cassandra upgrade , this is another journey to major upgrade apache cassandra from version 1.0 t...
Saturday, May 9, 2015

Light walkthrough on Java Execution Time Measurement Library (JETM)

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Today, let's learn a java library, Java Execution Time Measurement Library or JETM . What is JETM? From the official site A small and f...
Friday, May 8, 2015

Elasticsearch no node exception happened in tomcat web container

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If you ever get the stack trace in web container log file such as below and wondering how to solve these. Then read on but first, a little b...
Saturday, April 25, 2015

My way of solving tomcat memory leaking issue

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Recently, I did a mistake by accidentally commit a stupid static codes into a static method into production causing heap usage grow tremendo...
Friday, April 24, 2015

Learning java jstat

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Today, we will going to learn a java tool, which is incredibly useful if you are frequent coding for java application. This java tool is a m...
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Sunday, March 29, 2015

My journey and experience on upgrading apache cassandra 1.0.8 to 1.0.12

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Upon request of my blog reader, today I will share with you my experience on upgrading apache cassandra version 1.0.8 to 1.0.12 on a produc...
Saturday, March 28, 2015

Investigate into apache cassandra corrupt sstable exception

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Today, we will take a look at another apache cassandra 1.0.8 exception. Example of stack trace below. ERROR [SSTableBatchOpen:2] 2015-03-07 ...
Friday, March 27, 2015

Investigate into apache cassandra get_slice assertion error

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Today, we will investigate another error from apache cassandra. Error as shown below in cassandra log. ERROR [Thrift:2] 2015-02-11 11:06:10,...
Sunday, March 15, 2015

Investigate into elasticsearch already flushing exception

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Today, we will take a look at another elasticsearch issue. The example of message output in the log file happened in one of my node. [2015-...
Saturday, March 14, 2015

Investigate into elasticsearch indices memory marking shard active or inactive

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If you have enable logging for indices memory controller indices.memory: DEBUG in logging.yml in elasticsearch 0.90 to see how is the sha...
Friday, March 13, 2015

check out java wait, notify and notifyAll method

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If you have been program java for a while already, you will most probably encounter method such as wait , notify and notifyAll . Example sc...