https://community.cloudera.com/t5/Support-Questions/Datanode-Failures-DataXceiver-error-processing-WRITE-BLOCK/m-p/173848#M136111 <P>Hi<A rel="user" href="https://community.cloudera.com/users/3938/joshuaadeleke.html" nodeid="3938"> @Joshua Adeleke</A>, how frequently do you see the errors. These are some times seen in busy clusters and usually clients/HDFS recover from transient failures.</P><P>If there are no job or task failures around the time you of the errors, I would just ignore them.</P><P><STRONG>Edit</STRONG>: I took a look at your attached log file. There's a lot of GC pauses as <A rel="user" href="https://community.cloudera.com/users/102/nmaheshwari.html" nodeid="102">@Namit Maheshwari</A> pointed out.</P><P>Try increasing the DataNode heap size and PermGen/NewGen allocations until the GC pauses go away. </P><PRE>2017-03-25 10:10:18,219 WARN util.JvmPauseMonitor (JvmPauseMonitor.java:run(192)) - Detected pause in JVM or host machine (eg GC): pause of approximately 44122ms GC pool 'ConcurrentMarkSweep' had collection(s): count=1 time=44419ms</PRE> Tue, 28 Mar 2017 01:37:07 GMT ArpitAgarwal 2017-03-28T01:37:07Z