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https://issues.apache.org/jira/browse/ACCUMULO-4063?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15081246#comment-15081246
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Josh Elser commented on ACCUMULO-4063:
--------------------------------------
bq. Are they checking on the master lock, or their own?
I thought they were checking their own, but I realized after my last comment I
should probably actually look at the code and figure out which calls do what.
Let me do that and get back.
> TServer should verify its lock is held before answering any RPC
> ---------------------------------------------------------------
>
> Key: ACCUMULO-4063
> URL: https://issues.apache.org/jira/browse/ACCUMULO-4063
> Project: Accumulo
> Issue Type: Bug
> Components: rpc, tserver
> Affects Versions: 1.7.0
> Reporter: Josh Elser
> Fix For: 1.7.2, 1.8.0
>
>
> Noticing the following:
> {noformat}
> 2015-11-19 22:42:47,130 [thrift.ProcessFunction] ERROR: Internal error
> processing flush
> org.apache.thrift.TException: Lock not acquired
> at
> org.apache.accumulo.server.rpc.RpcWrapper$1.invoke(RpcWrapper.java:51)
> at com.sun.proxy.$Proxy21.flush(Unknown Source)
> at
> org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Processor$flush.getResult(TabletClientService.java:2671)
> at
> org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Processor$flush.getResult(TabletClientService.java:2657)
> at org.apache.thrift.ProcessFunction.process(ProcessFunction.java:39)
> at org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:39)
> at
> org.apache.accumulo.server.rpc.TimedProcessor.process(TimedProcessor.java:63)
> at
> org.apache.thrift.server.AbstractNonblockingServer$FrameBuffer.invoke(AbstractNonblockingServer.java:516)
> at
> org.apache.accumulo.server.rpc.CustomNonBlockingServer$1.run(CustomNonBlockingServer.java:78)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at
> org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
> at java.lang.Thread.run(Thread.java:745)
> 2015-11-19 22:42:47,402 [tserver.TabletServer$ThriftClientHandler] ERROR:
> org.apache.accumulo.tserver.session.MultiScanSession cannot be cast to
> org.apache.accumulo.tserver.session.ScanSession
> java.lang.ClassCastException:
> org.apache.accumulo.tserver.session.MultiScanSession cannot be cast to
> org.apache.accumulo.tserver.session.ScanSession
> at
> org.apache.accumulo.tserver.TabletServer$ThriftClientHandler.closeScan(TabletServer.java:574)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:497)
> at
> org.apache.accumulo.core.trace.wrappers.RpcServerInvocationHandler.invoke(RpcServerInvocationHandler.java:46)
> at
> org.apache.accumulo.server.rpc.RpcWrapper$1.invoke(RpcWrapper.java:47)
> at com.sun.proxy.$Proxy21.closeScan(Unknown Source)
> at
> org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Processor$closeScan.getResult(TabletClientService.java:2309)
> at
> org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Processor$closeScan.getResult(TabletClientService.java:2295)
> at org.apache.thrift.ProcessFunction.process(ProcessFunction.java:39)
> at org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:39)
> at
> org.apache.accumulo.server.rpc.TimedProcessor.process(TimedProcessor.java:63)
> at
> org.apache.thrift.server.AbstractNonblockingServer$FrameBuffer.invoke(AbstractNonblockingServer.java:516)
> at
> org.apache.accumulo.server.rpc.CustomNonBlockingServer$1.run(CustomNonBlockingServer.java:78)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at
> org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
> at java.lang.Thread.run(Thread.java:745)
> {noformat}
> a {{flush}} rpc came in and was denied, but then a {{closeScan}} came in and
> threw an unrelated error (ignore the classcast for now).
> Are there _any_ RPCs that a tabletserver should answer before it holds its
> lock?
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