Hello All, If our read of https://issues.apache.org/jira/browse/HBASE-5898 is correct it talks about three issues:
#1 Contention on a lock causing bad performance #2 HDFS slowness causing IPC handlers blocked for large times. #3 A mysterious bug which causes what looks like a deadlock In out environment[1] we are seeing #3 (ish) signals. Attached is the stack trace. One of our region server got blocked (almost all of IPC handlers) for 11 hours, so it can not be #1 OR #2. We have not back ported the patch yet so cant say if it fixes the issue or not. Also it is difficult to reproduce. There is a rumor that a program to reproduce this issue exist, does it? Eager to hear thoughts. [1] HBase version 0.92.2 , Hadoop version CDH3u0 -Shrijeet
