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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-2269) Multiple hung fate operations during randomwalk with agitation
Date Tue, 28 Jan 2014 18:53:41 GMT
Josh Elser created ACCUMULO-2269:
------------------------------------

             Summary: Multiple hung fate operations during randomwalk with agitation
                 Key: ACCUMULO-2269
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-2269
             Project: Accumulo
          Issue Type: Bug
          Components: fate, master
         Environment: 1.5.1-SNAPSHOT: 8981ba04
            Reporter: Josh Elser
            Priority: Critical
             Fix For: 1.5.1


Was running LongClean randomwalk with agitation. Came back to the system with three tables
"stuck" in DELETING on the monitor and a generally idle system. Upon investigation, multiple
fate txns appear to be deadlocked, in addition to the delete tables.

{noformat}
txid: 7ca950aa8de76a17  status: IN_PROGRESS         op: DeleteTable      locked: [W:2dc] 
       locking: []              top: CleanUp
txid: 1071086efdbed442  status: IN_PROGRESS         op: BulkImport       locked: [R:2cr] 
       locking: []              top: LoadFiles
txid: 32b86cfe06c2ed5d  status: IN_PROGRESS         op: DeleteTable      locked: [W:2d9] 
       locking: []              top: CleanUp
txid: 358c065b6cb0516b  status: IN_PROGRESS         op: DeleteTable      locked: [W:2dw] 
       locking: []              top: CleanUp
txid: 26b738ee0b044a96  status: IN_PROGRESS         op: BulkImport       locked: [R:2cr] 
       locking: []              top: CopyFailed
txid: 16edd31b3723dc5b  status: IN_PROGRESS         op: BulkImport       locked: [R:2cr] 
       locking: []              top: CopyFailed
txid: 63c587eb3df6c1b2  status: IN_PROGRESS         op: CompactRange     locked: [R:2cr] 
       locking: []              top: CompactionDriver
txid: 722d8e5488531735  status: IN_PROGRESS         op: BulkImport       locked: [R:2cr] 
       locking: []              top: CopyFailed
{noformat}

I started digging into the DeleteTable ops. Each txn still appears to be active and holds
the table_lock for their respective table in ZK, but the /tables/id/ node and all of its children
(state, conf, name, etc) still exist.

Looking at some thread dumps, I have the default (4) repo runner threads. 3 of them are blocked
on bulk imports

{noformat}
"Repo runner 2" daemon prio=10 tid=0x000000000262b800 nid=0x1ae7 waiting on condition [0x00007f25168e7000]
   java.lang.Thread.State: WAITING (parking)
        at sun.misc.Unsafe.park(Native Method)
        - parking to wait for  <0x0000000705a05eb8> (a java.util.concurrent.FutureTask)
        at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
        at java.util.concurrent.FutureTask.awaitDone(FutureTask.java:425)
        at java.util.concurrent.FutureTask.get(FutureTask.java:187)
        at org.apache.accumulo.server.master.tableOps.LoadFiles.call(BulkImport.java:561)
        at org.apache.accumulo.server.master.tableOps.LoadFiles.call(BulkImport.java:449)
        at org.apache.accumulo.server.master.tableOps.TraceRepo.call(TraceRepo.java:65)
        at org.apache.accumulo.fate.Fate$TransactionRunner.run(Fate.java:64)
        at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:34)
        at java.lang.Thread.run(Thread.java:744)
{noformat}

The 4th repo runner is stuck trying to reserve a new txn (not sure why he's locked like this
though)

{noformat}
"Repo runner 1" daemon prio=10 tid=0x0000000002627800 nid=0x1ae6 in Object.wait() [0x00007f25169e8000]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        at java.lang.Object.wait(Object.java:503)
        at org.apache.zookeeper.ClientCnxn.submitRequest(ClientCnxn.java:1313)
        - locked <0x00000007014d9928> (a org.apache.zookeeper.ClientCnxn$Packet)
        at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1149)
        at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1180)
        at org.apache.accumulo.fate.zookeeper.ZooReader.getData(ZooReader.java:44)
        at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.apache.accumulo.server.zookeeper.ZooReaderWriter$1.invoke(ZooReaderWriter.java:67)
        at com.sun.proxy.$Proxy11.getData(Unknown Source)
        at org.apache.accumulo.fate.ZooStore.reserve(ZooStore.java:160)
        at org.apache.accumulo.fate.AgeOffStore.reserve(AgeOffStore.java:156)
        at org.apache.accumulo.fate.Fate$TransactionRunner.run(Fate.java:52)
        at org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:34)
        at java.lang.Thread.run(Thread.java:744)
{noformat}

There were no obvious errors on the monitor, and the master is still presently in this state.



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