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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-3234) Merge fails to complete
Date Tue, 14 Oct 2014 22:58:33 GMT
Josh Elser created ACCUMULO-3234:
------------------------------------

             Summary: Merge fails to complete
                 Key: ACCUMULO-3234
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3234
             Project: Accumulo
          Issue Type: Bug
          Components: master, tserver
    Affects Versions: 1.6.1
            Reporter: Josh Elser
            Assignee: Josh Elser
             Fix For: 1.6.2, 1.7.0


Running the Shard module of Randomwalk.

Noticed that some driver code around the test had timed out:

{noformat}
14 02:44:21,839 [shard.Merge] DEBUG: merging ST_index_hostname_24487_1413254628126
14 02:46:22,129 [impl.ThriftTransportPool] WARN : Thread "org.apache.accumulo.test.randomwalk.Framework"
stuck on IO  to master:9999 (0) for at least 120050 ms
14 02:49:21,807 [randomwalk.Module] WARN : Node org.apache.accumulo.test.randomwalk.shard.Merge
has been running for 300.003 seconds. You may want to look into it.
{noformat}

A few seconds later, the master complains about the tabletserver failing to unload some tablets
for the table we're merging (presumably to do the merge), and the TabletServer hits an NPE
trying to run a MinC (line numbers screwed up, so omitting the stack traces). We start down
trying to get a new filename

{code}
FileRef newMapfileLocation = getNextMapFilename(mergeFile == null ? "F" : "M");
{code}

Which ultimately threw an AccessControlException from Hadoop because it tried to write to
the root of HDFS instead of the provided directory (issue #1).

This also cause an NPE in the finally block for the MinorCompactionTask on (issue #2)

{code}
minorCompaction.data("numEntries", Long.toString(this.stats.getNumEntries()));
{code}

Since all of this (+12hrs), the client is still blocked on the merge to complete, the tserver
is stuck in a loop trying to unload the tablets

{noformat}
2014-10-14 22:53:48,761 [tserver.Tablet] DEBUG: initiateClose(saveState=true queueMinC=false
disableWrites=false) 2w;00001a;000018
2014-10-14 22:53:48,761 [tserver.TabletServer] DEBUG: Failed to unload tablet 2w;00001a;000018...
it was alread closing or closed : Tablet 2w;00001a;000018 already closing
{noformat}

the master is stuck in a loop waiting for those tablets to go offline (I think)

{noformat}
2014-10-14 22:54:40,680 [state.MergeStats] INFO : Computing next merge state for 2w<<
which is presently WAITING_FOR_OFFLINE isDelete : false
2014-10-14 22:54:40,680 [state.MergeStats] INFO : 21 tablets are chopped, 0 are offline 2w<<
2014-10-14 22:54:40,680 [state.MergeStats] INFO : Waiting for 0 unassigned tablets to be 21
2w<<
2014-10-14 22:54:40,680 [master.Master] DEBUG: [Normal Tablets] sleeping for 60.00 seconds
2014-10-14 22:54:40,684 [master.Master] DEBUG: Finished gathering information from 1 servers
in 0.00 seconds
2014-10-14 22:54:40,685 [balancer.DefaultLoadBalancer] DEBUG: balance ended with 0 migrations
2014-10-14 22:54:40,685 [balancer.DefaultLoadBalancer] DEBUG: balance ended with 0 migrations
2014-10-14 22:54:40,685 [balancer.DefaultLoadBalancer] DEBUG: balance ended with 0 migrations
2014-10-14 22:54:40,686 [balancer.DefaultLoadBalancer] DEBUG: balance ended with 0 migrations
2014-10-14 22:54:40,686 [balancer.DefaultLoadBalancer] DEBUG: balance ended with 0 migrations
2014-10-14 22:54:40,686 [balancer.DefaultLoadBalancer] DEBUG: balance ended with 0 migrations
2014-10-14 22:54:40,804 [state.ZooTabletStateStore] DEBUG: Returning root tablet state: +r<<@(null,hostname:9997[1490be48ae20006],hostname:9997[1490be48ae20006])
2014-10-14 22:54:40,804 [master.Master] DEBUG: [Root Table]: scan time 0.00 seconds
2014-10-14 22:54:40,804 [master.Master] DEBUG: [Root Table] sleeping for 60.00 seconds
2014-10-14 22:54:40,830 [master.Master] DEBUG: [Metadata Tablets]: scan time 0.04 seconds
2014-10-14 22:54:40,830 [master.Master] DEBUG: [Metadata Tablets] sleeping for 60.00 seconds
2014-10-14 22:54:40,830 [master.Master] DEBUG: mergeInfo overlaps: 2w;000002< true
2014-10-14 22:54:40,831 [master.Master] DEBUG: mergeInfo overlaps: 2w;000004;000002 true
2014-10-14 22:54:40,831 [master.Master] DEBUG: mergeInfo overlaps: 2w;000006;000004 true
2014-10-14 22:54:40,832 [master.Master] DEBUG: mergeInfo overlaps: 2w;000008;000006 true
2014-10-14 22:54:40,832 [master.Master] DEBUG: mergeInfo overlaps: 2w;00000a;000008 true
2014-10-14 22:54:40,833 [master.Master] DEBUG: mergeInfo overlaps: 2w;00000c;00000a true
2014-10-14 22:54:40,833 [master.Master] DEBUG: mergeInfo overlaps: 2w;00000e;00000c true
2014-10-14 22:54:40,834 [master.Master] DEBUG: mergeInfo overlaps: 2w;000010;00000e true
2014-10-14 22:54:40,834 [master.Master] DEBUG: mergeInfo overlaps: 2w;000012;000010 true
2014-10-14 22:54:40,835 [master.Master] DEBUG: mergeInfo overlaps: 2w;000014;000012 true
2014-10-14 22:54:40,835 [master.Master] DEBUG: mergeInfo overlaps: 2w;000016;000014 true
2014-10-14 22:54:40,835 [master.Master] DEBUG: mergeInfo overlaps: 2w;000018;000016 true
2014-10-14 22:54:40,836 [master.Master] DEBUG: mergeInfo overlaps: 2w;00001a;000018 true
2014-10-14 22:54:40,836 [master.Master] DEBUG: mergeInfo overlaps: 2w;00001c;00001a true
2014-10-14 22:54:40,836 [master.Master] DEBUG: mergeInfo overlaps: 2w;00001e;00001c true
2014-10-14 22:54:40,837 [master.Master] DEBUG: mergeInfo overlaps: 2w;000020;00001e true
2014-10-14 22:54:40,837 [master.Master] DEBUG: mergeInfo overlaps: 2w;000022;000020 true
2014-10-14 22:54:40,837 [master.Master] DEBUG: mergeInfo overlaps: 2w;000024;000022 true
2014-10-14 22:54:40,838 [master.Master] DEBUG: mergeInfo overlaps: 2w;000026;000024 true
2014-10-14 22:54:40,838 [master.Master] DEBUG: mergeInfo overlaps: 2w;000028;000026 true
2014-10-14 22:54:40,839 [master.Master] DEBUG: mergeInfo overlaps: 2w<;000028 true
2014-10-14 22:54:40,839 [master.Master] DEBUG: [Normal Tablets]: scan time 0.04 seconds
2014-10-14 22:54:40,839 [master.EventCoordinator] INFO : [Normal Tablets]: 21 tablets unloaded
{noformat}

And the fate op is still locked (combined issue #3)

{noformat}
txid: 3a638f9642050e1a  status: IN_PROGRESS         op: TableRangeOp     locked: [W:2w, R:+default]
locking: []              top: TableRangeOpWait
{noformat}



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