https://community.cloudera.com/t5/Support-Questions/Region-servers-frequently-failing-wit-NullPointerException/m-p/174242#M136505 <P>Please consider upgrading to HDP-2.4.3. This issue was fixed in that release (as well as HDP-2.3.6).</P> Mon, 14 Nov 2016 23:34:47 GMT elserj 2016-11-14T23:34:47Z https://community.cloudera.com/t5/Support-Questions/Region-servers-frequently-failing-wit-NullPointerException/m-p/174241#M136504 <P>I am running a cluster with HDP 2.4.2 and HBase 1.1.2. I frequently (about once a day) have region server failure, and sometimes this involves a number of servers failing. I have looked in the logs, and a common cause of failure is the following error:</P><PRE>java.lang.NullPointerException at org.apache.hadoop.hbase.regionserver.HRegion.getOldestHfileTs(HRegion.java:1633) at org.apache.hadoop.hbase.regionserver.HRegionServer.createRegionLoad(HRegionServer.java:1465) at org.apache.hadoop.hbase.regionserver.HRegionServer.buildServerLoad(HRegionServer.java:1189) at org.apache.hadoop.hbase.regionserver.HRegionServer.tryRegionServerReport(HRegionServer.java:1132) at org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:949) at java.lang.Thread.run(Thread.java:745) </PRE><P>This seems to be related to the following JIRA: <A href="https://issues.apache.org/jira/browse/HBASE-14798" target="_blank">https://issues.apache.org/jira/browse/HBASE-14798</A>. This does provide a patch as far back as 1.1.4, but since we're using 1.1.2 the patch does not apply to my version. Does anybody know how I can avoid or fix this problem on this version of HBase? Thanks in advance.</P> Mon, 14 Nov 2016 20:38:41 GMT https://community.cloudera.com/t5/Support-Questions/Region-servers-frequently-failing-wit-NullPointerException/m-p/174241#M136504 Mark_Heydenrych 2016-11-14T20:38:41Z https://community.cloudera.com/t5/Support-Questions/Region-servers-frequently-failing-wit-NullPointerException/m-p/174242#M136505 <P>Please consider upgrading to HDP-2.4.3. This issue was fixed in that release (as well as HDP-2.3.6).</P> Mon, 14 Nov 2016 23:34:47 GMT https://community.cloudera.com/t5/Support-Questions/Region-servers-frequently-failing-wit-NullPointerException/m-p/174242#M136505 elserj 2016-11-14T23:34:47Z https://community.cloudera.com/t5/Support-Questions/Region-servers-frequently-failing-wit-NullPointerException/m-p/174243#M136506 <P>Thanks for the info. I've spoken to my manager, we're going to upgrade to 2.4.3</P> Tue, 15 Nov 2016 18:38:12 GMT https://community.cloudera.com/t5/Support-Questions/Region-servers-frequently-failing-wit-NullPointerException/m-p/174243#M136506 Mark_Heydenrych 2016-11-15T18:38:12Z