What is this?

This is an example of how one can crash an HBase region server with a custom filter. It simply runs the region server out of memory.

To build the JAR:

Simply run the following to build: mvn package

To deploy workflow:

One will deploy the filter by copying the built JAR in target/CrashFilter-0.0.1-SNAPSHOT.jar to their HBase region server lib directory. Then restart the region server.

To crash your region server

One will need to run the filter to crash the region server; to do this, one can request the filter via: echo 'scan "hbase:meta", {FILTER=> com.bloomberg.hbase.CrashFilter.new()}' | hbase shell

One will see the following upon running out of resources (crashing):

• From hbase shell:

scan "hbase:meta", {FILTER=> com.bloomberg.hbase.CrashFilter.new()}
ROW                   COLUMN+CELL

ERROR: Call id=0, waitTime=59996, operationTimeout=59995 expired.

• In the standard error log of the RegionServer hosting hbase:meta: java.lang.OutOfMemoryError: Java heap space (After that the regionserver will exit if configured ot exit on out of memory.)

Thanks

Thanks to Lars George for his custom filter example at https://github.com/larsgeorge/hbase-book/blob/cbb4bd05e30fb7956e43d7327ca7086c0578e8e2/ch04/src/main/java/filters/CustomFilter.java