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HBase >> mail # user >> REST servers locked up on single RS malfunction.

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REST servers locked up on single RS malfunction.
Hello, with 0.89 HBASE, we see the following, all REST servers get
locked on trying to connect to one of our RS servers, the error in the
.out file on that Region Server looks like this:

Exception in thread "pool-1-thread-3" java.lang.OutOfMemoryError: Java
heap space
at org.apache.hadoop.hbase.ipc.HBaseRPC$Invocation.readFields(HBaseRPC.java:120)
at org.apache.hadoop.hbase.ipc.HBaseServer$Connection.processData(HBaseServer.java:959)
at org.apache.hadoop.hbase.ipc.HBaseServer$Connection.readAndProcess(HBaseServer.java:927)
at org.apache.hadoop.hbase.ipc.HBaseServer$Listener.doRead(HBaseServer.java:503)
at org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader.run(HBaseServer.java:297)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)

Question is, how come the region server did not die after this but
just hogged the REST connections?  And what is pool1-thread-3 actually