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From Keith Turner <ke...@deenlo.com>
Subject Re: Accumulo on MapR Continued - LargeRowTest
Date Wed, 11 Apr 2012 14:32:52 GMT
Comments inline below

On Wed, Apr 11, 2012 at 9:48 AM, Keys Botzum <kbotzum@maprtech.com> wrote:
> Keith,
>
> Thanks for the suggestion.  I made the change to the source as you suggested and rebuilt
it using Maven (surprisingly easy).
>
> Here's the log from tserver now. Does this help at all? I can of course provide the complete
log or logs if useful to you. I can also provide the temporary tables and such if that's useful.
>
>
> 10 15:44:07,786 [cache.LruBlockCache] DEBUG: Block cache LRU eviction completed. Freed
2494168 bytes.  Priority Sizes: Single=3.2550507MB (3413168), Multi=1
> 3.89547MB (14570456),Memory=0.0MB (0)
> 10 15:44:07,798 [rfile.RelativeKey] DEBUG: len : 131072
> 10 15:44:07,799 [rfile.RelativeKey] DEBUG: data : Z"?7-,mE:5Di&ou.4/4.i+9zGo0K8%%TsSt#!&a!&s
:OKl:2"cp>]yT(ZeP
> 10 15:44:07,799 [rfile.RelativeKey] DEBUG: len : 0
> 10 15:44:07,799 [rfile.RelativeKey] DEBUG: data :
> 10 15:44:07,799 [rfile.RelativeKey] DEBUG: len : 0
> 10 15:44:07,799 [rfile.RelativeKey] DEBUG: data :
> 10 15:44:07,799 [rfile.RelativeKey] DEBUG: len : 0
> 10 15:44:07,799 [rfile.RelativeKey] DEBUG: data :

This looks like the data I would expect for this test, it reads a 128k
row, then a 0 len colfam, 0 len colqual, and 0 len colvis.

> 10 15:44:07,799 [tabletserver.TabletServer] DEBUG: ScanSess tid 10.250.99.204:52572 2
1 entries in 0.03 secs, nbTimes = [25 25 25.00 1]
> 10 15:44:07,828 [rfile.RelativeKey] DEBUG: len : 65
> 10 15:44:07,828 [rfile.RelativeKey] DEBUG: data : SjC)$OQ7U!9Ng:i1#2Sxl.a"(d=Js>d!1u`)WAFAs{>n=7H<tM?.tP"RsUOI
> 10 15:44:07,828 [rfile.RelativeKey] DEBUG: len : 47

The reads above do not look right, the data looks like the data that
would be generated for the row.  However, the length is not right. Its
65 bytes instead of 128k.  Now it may not be trying to read the row,
there is not enough information here to be sure.  But its definitely
trying to read two fields that look rows in the test data, and the
lengths are not whats expected.  So the read is off, I suspect its not
starting read the key in the right place for some reason.  I am going
to look around in the code and see where the best places to add some
more debug might be.

> 10 15:44:07,833 [problems.ProblemReports] DEBUG: Filing problem report 2 FILE_READ /user/mapr/accumulo-SE-test-04-18004/tables/2/t-0000000/F000000p.rf
> 10 15:44:07,834 [tabletserver.TabletServer] WARN : exception while scanning tablet 2;%9e.07Zx{t*taPSI\\;I4z*77vIG[Oa&(Dw?4_N(!OIA#Z(ZE%"v3gI9Q{ZlGNAGL@...
T
> RUNCATED<
> java.io.EOFException
>        at java.io.DataInputStream.readFully(DataInputStream.java:180)
>        at java.io.DataInputStream.readFully(DataInputStream.java:152)
>        at org.apache.accumulo.core.file.rfile.RelativeKey.read(RelativeKey.java:381)
>        at org.apache.accumulo.core.file.rfile.RelativeKey.readFields(RelativeKey.java:135)
>        at org.apache.accumulo.core.file.rfile.RFile$LocalityGroupReader._next(RFile.java:584)
>        at org.apache.accumulo.core.file.rfile.RFile$LocalityGroupReader.next(RFile.java:556)
>        at org.apache.accumulo.core.iterators.system.HeapIterator.next(HeapIterator.java:80)
>        at org.apache.accumulo.server.problems.ProblemReportingIterator.next(ProblemReportingIterator.java:77)
>        at org.apache.accumulo.core.iterators.system.HeapIterator.next(HeapIterator.java:80)
>        at org.apache.accumulo.core.iterators.system.DeletingIterator.next(DeletingIterator.java:58)
>        at org.apache.accumulo.core.iterators.WrappingIterator.next(WrappingIterator.java:87)
>        at org.apache.accumulo.core.iterators.Filter.next(Filter.java:58)
>        at org.apache.accumulo.core.iterators.WrappingIterator.next(WrappingIterator.java:87)
>        at org.apache.accumulo.core.iterators.Filter.next(Filter.java:58)
>        at org.apache.accumulo.core.iterators.WrappingIterator.next(WrappingIterator.java:87)
>        at org.apache.accumulo.core.iterators.user.VersioningIterator.skipRowColumn(VersioningIterator.java:103)
>        at org.apache.accumulo.core.iterators.user.VersioningIterator.next(VersioningIterator.java:53)
>        at org.apache.accumulo.core.iterators.system.SourceSwitchingIterator.readNext(SourceSwitchingIterator.java:120)
>        at org.apache.accumulo.core.iterators.system.SourceSwitchingIterator.next(SourceSwitchingIterator.java:105)
>        at org.apache.accumulo.server.tabletserver.Tablet.nextBatch(Tablet.java:1766)
>        at org.apache.accumulo.server.tabletserver.Tablet.access$3200(Tablet.java:143)
>        at org.apache.accumulo.server.tabletserver.Tablet$Scanner.read(Tablet.java:1883)
>        at org.apache.accumulo.server.tabletserver.TabletServer$ThriftClientHandler$NextBatchTask.run(TabletServer.java:905)
>        at org.apache.accumulo.cloudtrace.instrument.TraceRunnable.run(TraceRunnable.java:47)
>        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:662)
>
>
> It appears to be attempting to read 47 bytes but isn't succeeding. Out of curiosity I
changed the code to read what it could and print a warning. Here's the new code version:
>
>
> And this is a snippet of the exception which occurs with that change. Everything else
is the same. As you can see my hack gets us past the read of the key, but then the next read
fails.
>
> 11 06:42:32,254 [rfile.RelativeKey] DEBUG: data :
> 11 06:42:32,254 [tabletserver.TabletServer] DEBUG: ScanSess tid 10.250.99.204:47993 2
1 entries in 0.02
>  secs, nbTimes = [23 23 23.00 1]
> 11 06:42:32,283 [rfile.RelativeKey] DEBUG: len : 65
> 11 06:42:32,283 [rfile.RelativeKey] DEBUG: data : SjC)$OQ7U!9Ng:i1#2Sxl.a"(d=Js>d!1u`)WAFAs{>n=7H<tM?.t
> P"RsUOI
> 11 06:42:32,283 [rfile.RelativeKey] DEBUG: len : 47
> 11 06:42:32,283 [rfile.RelativeKey] DEBUG: MISSING BYTES!!: read 45
> 11 06:42:32,283 [rfile.RelativeKey] DEBUG: data : )vRS>4 ?c>$Sgn#[QcscA!HAYcF;M_Jg3d&Jzc85$)6Y7^@^@
> 11 06:42:32,288 [problems.ProblemReports] DEBUG: Filing problem report 2 FILE_READ /user/mapr/accumulo-
> SE-test-04-32318/tables/2/t-0000000/F000000q.rf
> 11 06:42:32,289 [tabletserver.TabletServer] WARN : exception while scanning tablet 2;%9e.07Zx{t*taPSI\\
> ;I4z*77vIG[Oa&(Dw?4_N(!OIA#Z(ZE%"v3gI9Q{ZlGNAGL@... TRUNCATED<
> java.io.EOFException
>        at java.io.DataInputStream.readInt(DataInputStream.java:375)
>        at org.apache.accumulo.core.data.Value.readFields(Value.java:156)
>        at org.apache.accumulo.core.file.rfile.RFile$LocalityGroupReader._next(RFile.java:585)
>        at org.apache.accumulo.core.file.rfile.RFile$LocalityGroupReader.next(RFile.java:556)
>        at org.apache.accumulo.core.iterators.system.HeapIterator.next(HeapIterator.java:80)
>        at org.apache.accumulo.server.problems.ProblemReportingIterator.next(ProblemReportingIterator.j
>       …..
>
> So it looks like we are missing quite a bit of data.
>
> Any help or ideas appreciated.
>
> Thanks,
> Keys
> ________________________________
> Keys Botzum
> Senior Principal Technologist
> WW Systems Engineering
> kbotzum@maprtech.com
> 443-718-0098
> MapR Technologies
> http://www.mapr.com
>
>
>
> On Apr 10, 2012, at 5:23 PM, Keith Turner wrote:
>
>> Keys,
>>
>> Looking at the test, it writes out random rows that 128k in len.  The
>> column family and column qualifier it writes out are 0 bytes long.
>> When the non compression test failed, it was trying to read a column
>> qualifier.  If we assume that it was reading a column qualifier from
>> the test table then it should be calling readFully() with a zero
>> length array.
>>
>> Trying to think how to debug this.  One way may be to change the code
>> in RelativeKey to the following and run the test.  This will show us
>> what its trying to do right before it hits the eof, but it will also
>> generate a lot of noise as things scan the metadata table.
>>
>>  private byte[] read(DataInput in) throws IOException {
>>    int len = WritableUtils.readVInt(in);
>>    Logger.getLogger(RelativeKey.class.getName()).debug("len : " + len);
>>    byte[] data = new byte[len];
>>    in.readFully(data);
>>    Logger.getLogger(RelativeKey.class.getName()).debug("data : " +
>> new String(data).substring(0, Math.min(data.length, 60)));
>>    return data;
>>  }
>>
>> Keith
>>
>> On Tue, Apr 10, 2012 at 2:08 PM, Keys Botzum <kbotzum@maprtech.com> wrote:
>>> At this point all but two of the Accumulo test/system/auto tests have completed
successfully. This test is failing and I'm not quite sure why: org.apache.accumulo.server.test.functional.LargeRowTest
>>>
>>> When I run it, this is the output I see:
>>> ./run.py -t largerowtest -d -v10
>>> ….
>>> 09:45:18 runTest (simple.largeRow.LargeRowTest) .............................
DEBUG:test.auto:localhost: /opt/accumulo-1.4.0/bin/accumulo org.apache.accumulo.server.test.functional.FunctionalTest
-m localhost -u root -p secret -i SE-test-04-22187 org.apache.accumulo.server.test.functional.LargeRowTest
getConfig
>>> DEBUG:test.auto:{
>>> 'tserver.compaction.major.delay':'1',
>>> }
>>>
>>> DEBUG:test.auto:
>>> INFO:test.auto:killing accumulo processes everywhere
>>> DEBUG:test.auto:localhost: /opt/accumulo-1.4.0/test/system/auto/pkill.sh 9 1000
SE-test-04-22187.*org.apache.accumulo.start
>>> DEBUG:test.auto:localhost: hadoop fs -rmr /user/mapr/accumulo-SE-test-04-22187
>>> INFO:test.auto:Error output from command: rmr: cannot remove /user/mapr/accumulo-SE-test-04-22187:
No such file or directory.
>>> DEBUG:test.auto:Exit code: 255
>>> DEBUG:test.auto:localhost: /opt/accumulo-1.4.0/bin/accumulo init --clear-instance-name
>>> DEBUG:test.auto:Output from command: 10 09:45:20,539 [util.Initialize] INFO :
Hadoop Filesystem is maprfs:///
>>> 10 09:45:20,541 [util.Initialize] INFO : Accumulo data dir is /user/mapr/accumulo-SE-test-04-22187
>>> 10 09:45:20,541 [util.Initialize] INFO : Zookeeper server is SE-test-00:5181,SE-test-01:5181,SE-test-02:5181
>>> Instance name : SE-test-04-22187
>>> Enter initial password for root: ******
>>> Confirm initial password for root: ******
>>> 10 09:45:21,442 [util.NativeCodeLoader] INFO : Loaded the native-hadoop library
>>> 10 09:45:21,562 [security.ZKAuthenticator] INFO : Initialized root user with
username: root at the request of user !SYSTEM
>>> DEBUG:test.auto:Exit code: 0
>>> DEBUG:test.auto:localhost: /opt/accumulo-1.4.0/bin/accumulo logger
>>> DEBUG:test.auto:localhost: /opt/accumulo-1.4.0/bin/accumulo tserver
>>> DEBUG:test.auto:localhost: /opt/accumulo-1.4.0/bin/accumulo monitor
>>> DEBUG:test.auto:localhost: /opt/accumulo-1.4.0/bin/accumulo org.apache.accumulo.server.master.state.SetGoalState
NORMAL
>>> DEBUG:test.auto:Output from command: 10 09:45:22,529 [server.Accumulo] INFO :
Attempting to talk to zookeeper
>>> 10 09:45:22,750 [server.Accumulo] INFO : Zookeeper connected and initialized,
attemping to talk to HDFS
>>> 10 09:45:23,009 [server.Accumulo] INFO : Connected to HDFS
>>> DEBUG:test.auto:Exit code: 0
>>> DEBUG:test.auto:localhost: /opt/accumulo-1.4.0/bin/accumulo master
>>> DEBUG:test.auto:localhost: /opt/accumulo-1.4.0/bin/accumulo org.apache.accumulo.server.test.functional.FunctionalTest
-m localhost -u root -p secret -i SE-test-04-22187 org.apache.accumulo.server.test.functional.LargeRowTest
setup
>>> DEBUG:test.auto:
>>> DEBUG:test.auto:
>>> DEBUG:test.auto:localhost: /opt/accumulo-1.4.0/bin/accumulo org.apache.accumulo.server.test.functional.FunctionalTest
-m localhost -u root -p secret -i SE-test-04-22187 org.apache.accumulo.server.test.functional.LargeRowTest
run
>>> DEBUG:test.auto:Waiting for /opt/accumulo-1.4.0/bin/accumulo org.apache.accumulo.server.test.functional.FunctionalTest
-m localhost -u root -p secret -i SE-test-04-22187 org.apache.accumulo.server.test.functional.LargeRowTest
run to stop in 240 secs
>>> DEBUG:test.auto:err: Thread "org.apache.accumulo.server.test.functional.FunctionalTest"
died null
>>> DEBUG:test.auto:err: java.lang.reflect.InvocationTargetException
>>>        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>>        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>>>        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>>> DEBUG:test.auto:err:    at java.lang.reflect.Method.invoke(Method.java:597)
>>>        at org.apache.accumulo.start.Main$1.run(Main.java:89)
>>>        at java.lang.Thread.run(Thread.java:662)
>>> Caused by: java.lang.RuntimeException: org.apache.accumulo.core.client.impl.AccumuloServerException:
Error on server 10.250.99.204:39253
>>> DEBUG:test.auto:err:
>>>        at org.apache.accumulo.core.client.impl.ScannerIterator.hasNext(ScannerIterator.java:186)
>>>        at org.apache.accumulo.server.test.functional.LargeRowTest.verify(LargeRowTest.java:165)
>>>        at org.apache.accumulo.server.test.functional.LargeRowTest.basicTest(LargeRowTest.java:143)
>>>        at org.apache.accumulo.server.test.functional.LargeRowTest.test2(LargeRowTest.java:104)
>>>        at org.apache.accumulo.server.test.functional.LargeRowTest.run(LargeRowTest.java:87)
>>>        at org.apache.accumulo.server.test.functional.FunctionalTest.main(FunctionalTest.java:312)
>>>        ... 6 more
>>> DEBUG:test.auto:err: Caused by: org.apache.accumulo.core.client.impl.AccumuloServerException:
Error on server 10.250.99.204:39253
>>>        at org.apache.accumulo.core.client.impl.ThriftScanner.scan(ThriftScanner.java:302)
>>>        at org.apache.accumulo.core.client.impl.ScannerIterator$Reader.run(ScannerIterator.java:94)
>>>        at org.apache.accumulo.core.client.impl.ScannerIterator.hasNext(ScannerIterator.java:176)
>>>        ... 11 more
>>> Caused by: org.apache.thrift.TApplicationException: Internal error processing
startScan
>>>        at org.apache.thrift.TApplicationException.read(TApplicationException.java:108)
>>>        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.recv_startScan(TabletClientService.java:184)
>>>        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.startScan(TabletClientService.java:157)
>>>        at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
>>>        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>>>        at java.lang.reflect.Method.invoke(Method.java:597)
>>> DEBUG:test.auto:err:
>>>        at org.apache.accumulo.cloudtrace.instrument.thrift.TraceWrap$2.invoke(TraceWrap.java:84)
>>>        at $Proxy1.startScan(Unknown Source)
>>>        at org.apache.accumulo.core.client.impl.ThriftScanner.scan(ThriftScanner.java:415)
>>>        at org.apache.accumulo.core.client.impl.ThriftScanner.scan(ThriftScanner.java:295)
>>>        ... 13 more
>>> ERROR:test.auto:This looks like a stack trace: Thread "org.apache.accumulo.server.test.functional.FunctionalTest"
died null
>>> java.lang.reflect.InvocationTargetException
>>>        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>>        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>>>        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>>>        at java.lang.reflect.Method.invoke(Method.java:597)
>>>        at org.apache.accumulo.start.Main$1.run(Main.java:89)
>>>        at java.lang.Thread.run(Thread.java:662)
>>> Caused by: java.lang.RuntimeException: org.apache.accumulo.core.client.impl.AccumuloServerException:
Error on server 10.250.99.204:39253
>>>        at org.apache.accumulo.core.client.impl.ScannerIterator.hasNext(ScannerIterator.java:186)
>>>        at org.apache.accumulo.server.test.functional.LargeRowTest.verify(LargeRowTest.java:165)
>>>        at org.apache.accumulo.server.test.functional.LargeRowTest.basicTest(LargeRowTest.java:143)
>>>        at org.apache.accumulo.server.test.functional.LargeRowTest.test2(LargeRowTest.java:104)
>>>        at org.apache.accumulo.server.test.functional.LargeRowTest.run(LargeRowTest.java:87)
>>>        at org.apache.accumulo.server.test.functional.FunctionalTest.main(FunctionalTest.java:312)
>>>        ... 6 more
>>> Caused by: org.apache.accumulo.core.client.impl.AccumuloServerException: Error
on server 10.250.99.204:39253
>>>        at org.apache.accumulo.core.client.impl.ThriftScanner.scan(ThriftScanner.java:302)
>>>        at org.apache.accumulo.core.client.impl.ScannerIterator$Reader.run(ScannerIterator.java:94)
>>>        at org.apache.accumulo.core.client.impl.ScannerIterator.hasNext(ScannerIterator.java:176)
>>>        ... 11 more
>>> Caused by: org.apache.thrift.TApplicationException: Internal error processing
startScan
>>>        at org.apache.thrift.TApplicationException.read(TApplicationException.java:108)
>>>        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.recv_startScan(TabletClientService.java:184)
>>>        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.startScan(TabletClientService.java:157)
>>>        at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
>>>        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>>>        at java.lang.reflect.Method.invoke(Method.java:597)
>>>        at org.apache.accumulo.cloudtrace.instrument.thrift.TraceWrap$2.invoke(TraceWrap.java:84)
>>>        at $Proxy1.startScan(Unknown Source)
>>>        at org.apache.accumulo.core.client.impl.ThriftScanner.scan(ThriftScanner.java:415)
>>>        at org.apache.accumulo.core.client.impl.ThriftScanner.scan(ThriftScanner.java:295)
>>>        ... 13 more
>>>
>>> FAIL
>>> ======================================================================
>>> FAIL: runTest (simple.largeRow.LargeRowTest)
>>> ----------------------------------------------------------------------
>>> Traceback (most recent call last):
>>>  File "/opt/accumulo-1.4.0/test/system/auto/JavaTest.py", line 57, in runTest
>>>    self.waitForStop(handle, self.maxRuntime)
>>>  File "/opt/accumulo-1.4.0/test/system/auto/TestUtils.py", line 368, in waitForStop
>>>    self.assert_(self.processResult(out, err, handle.returncode))
>>> AssertionError: False is not true
>>>
>>>
>>> ======================================================================
>>> FAIL: runTest (simple.largeRow.LargeRowTest)
>>> ----------------------------------------------------------------------
>>> Traceback (most recent call last):
>>>  File "/opt/accumulo-1.4.0/test/system/auto/JavaTest.py", line 57, in runTest
>>>    self.waitForStop(handle, self.maxRuntime)
>>>  File "/opt/accumulo-1.4.0/test/system/auto/TestUtils.py", line 368, in waitForStop
>>>    self.assert_(self.processResult(out, err, handle.returncode))
>>> AssertionError: False is not true
>>>
>>> ----------------------------------------------------------------------
>>> Ran 1 test in 43.014s
>>>
>>> FAILED (failures=1)
>>>
>>>
>>> The only log that seems to have any relevant output is the tserver_xxxx.log file.
In it I found this error:
>>> Note that the timestamps here do not match the previous timestamps. This is just
because I forgot to capture the data from the run that corresponds exactly to this run.
>>>
>>>
>>> 09 06:14:22,466 [tabletserver.TabletServer] INFO : Adding 1 logs for extent 2;F]\\;J^>ioHJ*gs[4TwSIQeN_C^]1!w@7e<wL<p.xE&TR\\g!lt6+c^0a3U7%Eo'Ji
... TRUNCATED;CJlc"pWa)g<$Gg(\\U0Kl<)ffOYm1{h@E1"nV$)z'7'8KNWt- .BISxZoDI^[?7jR... TRUNCATED
as alias 16
>>> 09 06:14:25,018 [tabletserver.TabletServer] WARN : exception while scanning tablet
2;h&["[>Er>fnBdhzAR_'I!Htot>R/hNK_vNG)Y1a%$DJWg#QyQHFZ RaUAF3[p!eb... TRUNCATED;\\]jx?h@XRt8nDO%{>vT-Et-P$b.<,-4b2osta{ZE\\$u9k2T-MpdF
_^<q\\M`X\\Er... TRUNCATED
>>> java.io.IOException: invalid distance too far back
>>>        at org.apache.hadoop.io.compress.zlib.ZlibDecompressor.inflateBytesDirect(Native
Method)
>>>        at org.apache.hadoop.io.compress.zlib.ZlibDecompressor.decompress(ZlibDecompressor.java:221)
>>>        at org.apache.hadoop.io.compress.DecompressorStream.decompress(DecompressorStream.java:81)
>>>        at org.apache.hadoop.io.compress.DecompressorStream.read(DecompressorStream.java:75)
>>>        at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
>>>        at java.io.BufferedInputStream.read(BufferedInputStream.java:237)
>>>        at java.io.FilterInputStream.read(FilterInputStream.java:66)
>>>        at java.io.DataInputStream.readByte(DataInputStream.java:248)
>>>        at org.apache.accumulo.core.file.rfile.RelativeKey.readFields(RelativeKey.java:116)
>>>        at org.apache.accumulo.core.file.rfile.RFile$LocalityGroupReader._next(RFile.java:584)
>>>        at org.apache.accumulo.core.file.rfile.RFile$LocalityGroupReader.next(RFile.java:556)
>>>        at org.apache.accumulo.core.iterators.system.HeapIterator.next(HeapIterator.java:80)
>>>        at org.apache.accumulo.server.problems.ProblemReportingIterator.next(ProblemReportingIterator.java:77)
>>>        at org.apache.accumulo.core.iterators.system.HeapIterator.next(HeapIterator.java:80)
>>>        at org.apache.accumulo.core.iterators.system.DeletingIterator.next(DeletingIterator.java:58)
>>>        at org.apache.accumulo.core.iterators.WrappingIterator.next(WrappingIterator.java:87)
>>>        at org.apache.accumulo.core.iterators.Filter.next(Filter.java:58)
>>>        at org.apache.accumulo.core.iterators.WrappingIterator.next(WrappingIterator.java:87)
>>>        at org.apache.accumulo.core.iterators.Filter.next(Filter.java:58)
>>>        at org.apache.accumulo.core.iterators.WrappingIterator.next(WrappingIterator.java:87)
>>>        at org.apache.accumulo.core.iterators.user.VersioningIterator.skipRowColumn(VersioningIterator.java:103)
>>>        at org.apache.accumulo.core.iterators.user.VersioningIterator.next(VersioningIterator.java:53)
>>>        at org.apache.accumulo.core.iterators.system.SourceSwitchingIterator.readNext(SourceSwitchingIterator.java:120)
>>>        at org.apache.accumulo.core.iterators.system.SourceSwitchingIterator.next(SourceSwitchingIterator.java:105)
>>>        at org.apache.accumulo.server.tabletserver.Tablet.nextBatch(Tablet.java:1766)
>>>        at org.apache.accumulo.server.tabletserver.Tablet.access$3200(Tablet.java:143)
>>>        at org.apache.accumulo.server.tabletserver.Tablet$Scanner.read(Tablet.java:1883)
>>>        at org.apache.accumulo.server.tabletserver.TabletServer$ThriftClientHandler$NextBatchTask.run(TabletServer.java:905)
>>>        at org.apache.accumulo.cloudtrace.instrument.TraceRunnable.run(TraceRunnable.java:47)
>>>        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:662)
>>> 09 06:14:25,020 [tabletserver.TabletServer] INFO : Adding 1 logs for extent !0<;~
as alias 2
>>> 09 06:14:25,022 [thrift.TabletClientService$Processor] ERROR: Internal error
processing startScan
>>> java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.io.IOException:
invalid distance too far back
>>>        at org.apache.accumulo.server.tabletserver.TabletServer$ThriftClientHandler.continueScan(TabletServer.java:1155)
>>>        at org.apache.accumulo.server.tabletserver.TabletServer$ThriftClientHandler.startScan(TabletServer.java:1110)
>>>        at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
>>>        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>>>        at java.lang.reflect.Method.invoke(Method.java:597)
>>>        at org.apache.accumulo.cloudtrace.instrument.thrift.TraceWrap$1.invoke(TraceWrap.java:59)
>>>        at $Proxy0.startScan(Unknown Source)
>>>        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Processor$startScan.process(TabletClientService.java:2059)
>>>        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Processor.process(TabletClientService.java:2037)
>>>        at org.apache.accumulo.server.util.TServerUtils$TimedProcessor.process(TServerUtils.java:154)
>>>        at org.apache.thrift.server.TNonblockingServer$FrameBuffer.invoke(TNonblockingServer.java:631)
>>>        at org.apache.accumulo.server.util.TServerUtils$THsHaServer$Invocation.run(TServerUtils.java:202)
>>>        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>>>        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>>>        at org.apache.accumulo.core.util.LoggingRunnable.run(LoggingRunnable.java:34)
>>>        at java.lang.Thread.run(Thread.java:662)
>>> Caused by: java.util.concurrent.ExecutionException: java.io.IOException: invalid
distance too far back
>>>        at org.apache.accumulo.server.tabletserver.TabletServer$ScanTask.get(TabletServer.java:662)
>>>        at org.apache.accumulo.server.tabletserver.TabletServer$ThriftClientHandler.continueScan(TabletServer.java:1146)
>>>        ... 15 more
>>> Caused by: java.io.IOException: invalid distance too far back
>>>        at org.apache.hadoop.io.compress.zlib.ZlibDecompressor.inflateBytesDirect(Native
Method)
>>>        at org.apache.hadoop.io.compress.zlib.ZlibDecompressor.decompress(ZlibDecompressor.java:221)
>>>        at org.apache.hadoop.io.compress.DecompressorStream.decompress(DecompressorStream.java:81)
>>>        at org.apache.hadoop.io.compress.DecompressorStream.read(DecompressorStream.java:75)
>>>        at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
>>>        at java.io.BufferedInputStream.read(BufferedInputStream.java:237)
>>>        at java.io.FilterInputStream.read(FilterInputStream.java:66)
>>>        at java.io.DataInputStream.readByte(DataInputStream.java:248)
>>>        at org.apache.accumulo.core.file.rfile.RelativeKey.readFields(RelativeKey.java:116)
>>>        at org.apache.accumulo.core.file.rfile.RFile$LocalityGroupReader._next(RFile.java:584)
>>>        at org.apache.accumulo.core.file.rfile.RFile$LocalityGroupReader.next(RFile.java:556)
>>>        at org.apache.accumulo.core.iterators.system.HeapIterator.next(HeapIterator.java:80)
>>>        at org.apache.accumulo.server.problems.ProblemReportingIterator.next(ProblemReportingIterator.java:77)
>>>        at org.apache.accumulo.core.iterators.system.HeapIterator.next(HeapIterator.java:80)
>>>        at org.apache.accumulo.core.iterators.system.DeletingIterator.next(DeletingIterator.java:58)
>>>        at org.apache.accumulo.core.iterators.WrappingIterator.next(WrappingIterator.java:87)
>>>        at org.apache.accumulo.core.iterators.Filter.next(Filter.java:58)
>>>        at org.apache.accumulo.core.iterators.WrappingIterator.next(WrappingIterator.java:87)
>>>        at org.apache.accumulo.core.iterators.Filter.next(Filter.java:58)
>>>        at org.apache.accumulo.core.iterators.WrappingIterator.next(WrappingIterator.java:87)
>>>        at org.apache.accumulo.core.iterators.user.VersioningIterator.skipRowColumn(VersioningIterator.java:103)
>>>        at org.apache.accumulo.core.iterators.user.VersioningIterator.next(VersioningIterator.java:53)
>>>        at org.apache.accumulo.core.iterators.system.SourceSwitchingIterator.readNext(SourceSwitchingIterator.java:120)
>>>        at org.apache.accumulo.core.iterators.system.SourceSwitchingIterator.next(SourceSwitchingIterator.java:105)
>>>        at org.apache.accumulo.server.tabletserver.Tablet.nextBatch(Tablet.java:1766)
>>>        at org.apache.accumulo.server.tabletserver.Tablet.access$3200(Tablet.java:143)
>>>        at org.apache.accumulo.server.tabletserver.Tablet$Scanner.read(Tablet.java:1883)
>>>        at org.apache.accumulo.server.tabletserver.TabletServer$ThriftClientHandler$NextBatchTask.run(TabletServer.java:905)
>>>        at org.apache.accumulo.cloudtrace.instrument.TraceRunnable.run(TraceRunnable.java:47)
>>>        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>>>        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>>>        ... 1 more
>>>
>>>
>>> After guessing that the zlib error might be hiding the "real" error, I decided
to disable compression in Accumulo (compression in MapR is transparent and the results are
not affected by whether it is on or off). Normally I'd set table.file.compress.type to none
in the accumulo-site.xml file but that doesn't work for the tests as they generate they own
site files automatically. I hand edited TestUtil.py to generate a site file with that property
set.
>>>
>>> When I rerun the test, I get the same output from run.py, but the server error
in tserver_xxx.log is very different:
>>>
>>> 10 09:45:51,650 [tabletserver.TabletServer] INFO : Adding 1 logs for extent 2;(8{]laDN>C?'1D\\;K]l:fS\\lVXKOWq[_'&8".>-wL$Y,x-k<18_#t:7CHMH:\\)Zga...
TRUNCATED;%9e.07Zx{t*taPSI\\;I4z*77vIG[Oa&(Dw?4_N(!OIA#Z(ZE%"v3gI9Q{ZlGNAGL@... TRUNCATED
as alias 8
>>> 10 09:45:51,693 [tabletserver.TabletServer] INFO : Adding 1 logs for extent 2;k9TF\\;hI"]Ij'4\\P.t&'pJm3"\\;C0qd:Q>%G3>I6!5[pVN$5R0g1LwmPUg
5-fX4jG... TRUNCATED;h&["[>Er>fnBdhzAR_'I!Htot>R/hNK_vNG)Y1a%$DJWg#QyQHFZ RaUAF3[p!eb...
TRUNCATED as alias 22
>>> 10 09:45:51,748 [tabletserver.TabletServer] INFO : Adding 1 logs for extent 2;F]\\;J^>ioHJ*gs[4TwSIQeN_C^]1!w@7e<wL<p.xE&TR\\g!lt6+c^0a3U7%Eo'Ji
... TRUNCATED;CJlc"pWa)g<$Gg(\\U0Kl<)ffOYm1{h@E1"nV$)z'7'8KNWt- .BISxZoDI^[?7jR... TRUNCATED
as alias 16
>>> 10 09:46:00,996 [tabletserver.TabletServer] WARN : exception while scanning tablet
2;%9e.07Zx{t*taPSI\\;I4z*77vIG[Oa&(Dw?4_N(!OIA#Z(ZE%"v3gI9Q{ZlGNAGL@... TRUNCATED<
>>> java.io.EOFException
>>>        at java.io.DataInputStream.readFully(DataInputStream.java:180)
>>>        at java.io.DataInputStream.readFully(DataInputStream.java:152)
>>>        at org.apache.accumulo.core.file.rfile.RelativeKey.read(RelativeKey.java:378)
>>>        at org.apache.accumulo.core.file.rfile.RelativeKey.readFields(RelativeKey.java:134)
>>>        at org.apache.accumulo.core.file.rfile.RFile$LocalityGroupReader._next(RFile.java:584)
>>>        at org.apache.accumulo.core.file.rfile.RFile$LocalityGroupReader.next(RFile.java:556)
>>>        at org.apache.accumulo.core.iterators.system.HeapIterator.next(HeapIterator.java:80)
>>>        at org.apache.accumulo.server.problems.ProblemReportingIterator.next(ProblemReportingIterator.java:77)
>>>        at org.apache.accumulo.core.iterators.system.HeapIterator.next(HeapIterator.java:80)
>>>        at org.apache.accumulo.core.iterators.system.DeletingIterator.next(DeletingIterator.java:58)
>>>        at org.apache.accumulo.core.iterators.WrappingIterator.next(WrappingIterator.java:87)
>>>        at org.apache.accumulo.core.iterators.Filter.next(Filter.java:58)
>>>        at org.apache.accumulo.core.iterators.WrappingIterator.next(WrappingIterator.java:87)
>>>        at org.apache.accumulo.core.iterators.Filter.next(Filter.java:58)
>>>        at org.apache.accumulo.core.iterators.WrappingIterator.next(WrappingIterator.java:87)
>>>        at org.apache.accumulo.core.iterators.user.VersioningIterator.skipRowColumn(VersioningIterator.java:103)
>>>        at org.apache.accumulo.core.iterators.user.VersioningIterator.next(VersioningIterator.java:53)
>>>        at org.apache.accumulo.core.iterators.system.SourceSwitchingIterator.readNext(SourceSwitchingIterator.java:120)
>>>        at org.apache.accumulo.core.iterators.system.SourceSwitchingIterator.next(SourceSwitchingIterator.java:105)
>>>        at org.apache.accumulo.server.tabletserver.Tablet.nextBatch(Tablet.java:1766)
>>>        at org.apache.accumulo.server.tabletserver.Tablet.access$3200(Tablet.java:143)
>>>        at org.apache.accumulo.server.tabletserver.Tablet$Scanner.read(Tablet.java:1883)
>>>        at org.apache.accumulo.server.tabletserver.TabletServer$ThriftClientHandler$NextBatchTask.run(TabletServer.java:905)
>>>        at org.apache.accumulo.cloudtrace.instrument.TraceRunnable.run(TraceRunnable.java:47)
>>>        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:662)
>>> 10 09:46:00,999 [tabletserver.TabletServer] INFO : Adding 1 logs for extent !0<;~
as alias 2
>>> 10 09:46:01,000 [thrift.TabletClientService$Processor] ERROR: Internal error
processing startScan
>>> java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.io.EOFException
>>>        at org.apache.accumulo.server.tabletserver.TabletServer$ThriftClientHandler.continueScan(TabletServer.java:1155)
>>>        at org.apache.accumulo.server.tabletserver.TabletServer$ThriftClientHandler.startScan(TabletServer.java:1110)
>>>        at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
>>>        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>>>        at java.lang.reflect.Method.invoke(Method.java:597)
>>>        at org.apache.accumulo.cloudtrace.instrument.thrift.TraceWrap$1.invoke(TraceWrap.java:59)
>>>        at $Proxy0.startScan(Unknown Source)
>>>        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Processor$startScan.process(TabletClientService.java:2059)
>>>        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Processor.process(TabletClientService.java:2037)
>>>        at org.apache.accumulo.server.util.TServerUtils$TimedProcessor.process(TServerUtils.java:154)
>>>        at org.apache.thrift.server.TNonblockingServer$FrameBuffer.invoke(TNonblockingServer.java:631)
>>>        at org.apache.accumulo.server.util.TServerUtils$THsHaServer$Invocation.run(TServerUtils.java:202)
>>>        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>>>        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>>>        at org.apache.accumulo.core.util.LoggingRunnable.run(LoggingRunnable.java:34)
>>>        at java.lang.Thread.run(Thread.java:662)
>>> Caused by: java.util.concurrent.ExecutionException: java.io.EOFException
>>>        at org.apache.accumulo.server.tabletserver.TabletServer$ScanTask.get(TabletServer.java:662)
>>>        at org.apache.accumulo.server.tabletserver.TabletServer$ThriftClientHandler.continueScan(TabletServer.java:1146)
>>>        ... 15 more
>>> Caused by: java.io.EOFException
>>>        at java.io.DataInputStream.readFully(DataInputStream.java:180)
>>>        at java.io.DataInputStream.readFully(DataInputStream.java:152)
>>>        at org.apache.accumulo.core.file.rfile.RelativeKey.read(RelativeKey.java:378)
>>>        at org.apache.accumulo.core.file.rfile.RelativeKey.readFields(RelativeKey.java:134)
>>>        at org.apache.accumulo.core.file.rfile.RFile$LocalityGroupReader._next(RFile.java:584)
>>>        at org.apache.accumulo.core.file.rfile.RFile$LocalityGroupReader.next(RFile.java:556)
>>>        at org.apache.accumulo.core.iterators.system.HeapIterator.next(HeapIterator.java:80)
>>>        at org.apache.accumulo.server.problems.ProblemReportingIterator.next(ProblemReportingIterator.java:77)
>>>        at org.apache.accumulo.core.iterators.system.HeapIterator.next(HeapIterator.java:80)
>>>        at org.apache.accumulo.core.iterators.system.DeletingIterator.next(DeletingIterator.java:58)
>>>        at org.apache.accumulo.core.iterators.WrappingIterator.next(WrappingIterator.java:87)
>>>        at org.apache.accumulo.core.iterators.Filter.next(Filter.java:58)
>>>        at org.apache.accumulo.core.iterators.WrappingIterator.next(WrappingIterator.java:87)
>>>        at org.apache.accumulo.core.iterators.Filter.next(Filter.java:58)
>>>        at org.apache.accumulo.core.iterators.WrappingIterator.next(WrappingIterator.java:87)
>>>        at org.apache.accumulo.core.iterators.user.VersioningIterator.skipRowColumn(VersioningIterator.java:103)
>>>        at org.apache.accumulo.core.iterators.user.VersioningIterator.next(VersioningIterator.java:53)
>>>        at org.apache.accumulo.core.iterators.system.SourceSwitchingIterator.readNext(SourceSwitchingIterator.java:120)
>>>        at org.apache.accumulo.core.iterators.system.SourceSwitchingIterator.next(SourceSwitchingIterator.java:105)
>>>        at org.apache.accumulo.server.tabletserver.Tablet.nextBatch(Tablet.java:1766)
>>>        at org.apache.accumulo.server.tabletserver.Tablet.access$3200(Tablet.java:143)
>>>        at org.apache.accumulo.server.tabletserver.Tablet$Scanner.read(Tablet.java:1883)
>>>        at org.apache.accumulo.server.tabletserver.TabletServer$ThriftClientHandler$NextBatchTask.run(TabletServer.java:905)
>>>        at org.apache.accumulo.cloudtrace.instrument.TraceRunnable.run(TraceRunnable.java:47)
>>>        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:662)
>>> 10 09:46:00,999 [tabletserver.TabletServer] INFO : Adding 1 logs for extent !0<;~
as alias 2
>>> 10 09:46:01,000 [thrift.TabletClientService$Processor] ERROR: Internal error
processing startScan
>>> java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.io.EOFException
>>>        at org.apache.accumulo.server.tabletserver.TabletServer$ThriftClientHandler.continueScan(TabletServer.java:1155)
>>>        at org.apache.accumulo.server.tabletserver.TabletServer$ThriftClientHandler.startScan(TabletServer.java:1110)
>>>        at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
>>>        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>>>        at java.lang.reflect.Method.invoke(Method.java:597)
>>>        at org.apache.accumulo.cloudtrace.instrument.thrift.TraceWrap$1.invoke(TraceWrap.java:59)
>>>        at $Proxy0.startScan(Unknown Source)
>>>        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Processor$startScan.process(TabletClientService.java:2059)
>>>        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Processor.process(TabletClientService.java:2037)
>>>        at org.apache.accumulo.server.util.TServerUtils$TimedProcessor.process(TServerUtils.java:154)
>>>        at org.apache.thrift.server.TNonblockingServer$FrameBuffer.invoke(TNonblockingServer.java:631)
>>>        at org.apache.accumulo.server.util.TServerUtils$THsHaServer$Invocation.run(TServerUtils.java:202)
>>>        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>>>        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>>>        at org.apache.accumulo.core.util.LoggingRunnable.run(LoggingRunnable.java:34)
>>>        at java.lang.Thread.run(Thread.java:662)
>>> Caused by: java.util.concurrent.ExecutionException: java.io.EOFException
>>>        at org.apache.accumulo.server.tabletserver.TabletServer$ScanTask.get(TabletServer.java:662)
>>>        at org.apache.accumulo.server.tabletserver.TabletServer$ThriftClientHandler.continueScan(TabletServer.java:1146)
>>>        ... 15 more
>>> Caused by: java.io.EOFException
>>>        at java.io.DataInputStream.readFully(DataInputStream.java:180)
>>>        at java.io.DataInputStream.readFully(DataInputStream.java:152)
>>>        at org.apache.accumulo.core.file.rfile.RelativeKey.read(RelativeKey.java:378)
>>>        at org.apache.accumulo.core.file.rfile.RelativeKey.readFields(RelativeKey.java:134)
>>>        at org.apache.accumulo.core.file.rfile.RFile$LocalityGroupReader._next(RFile.java:584)
>>>        at org.apache.accumulo.core.file.rfile.RFile$LocalityGroupReader.next(RFile.java:556)
>>>        at org.apache.accumulo.core.iterators.system.HeapIterator.next(HeapIterator.java:80)
>>>        at org.apache.accumulo.server.problems.ProblemReportingIterator.next(ProblemReportingIterator.java:77)
>>>        at org.apache.accumulo.core.iterators.system.HeapIterator.next(HeapIterator.java:80)
>>>        at org.apache.accumulo.core.iterators.system.DeletingIterator.next(DeletingIterator.java:58)
>>>        at org.apache.accumulo.core.iterators.WrappingIterator.next(WrappingIterator.java:87)
>>>        at org.apache.accumulo.core.iterators.Filter.next(Filter.java:58)
>>>        at org.apache.accumulo.core.iterators.WrappingIterator.next(WrappingIterator.java:87)
>>>        at org.apache.accumulo.core.iterators.Filter.next(Filter.java:58)
>>>        at org.apache.accumulo.core.iterators.WrappingIterator.next(WrappingIterator.java:87)
>>>        at org.apache.accumulo.core.iterators.Filter.next(Filter.java:58)
>>>        at org.apache.accumulo.core.iterators.WrappingIterator.next(WrappingIterator.java:87)
>>>        at org.apache.accumulo.core.iterators.user.VersioningIterator.skipRowColumn(VersioningIterator.java:103)
>>>        at org.apache.accumulo.core.iterators.user.VersioningIterator.next(VersioningIterator.java:53)
>>>        at org.apache.accumulo.core.iterators.system.SourceSwitchingIterator.readNext(SourceSwitchingIterator.java:120)
>>>        at org.apache.accumulo.core.iterators.system.SourceSwitchingIterator.next(SourceSwitchingIterator.java:105)
>>>        at org.apache.accumulo.server.tabletserver.Tablet.nextBatch(Tablet.java:1766)
>>>        at org.apache.accumulo.server.tabletserver.Tablet.access$3200(Tablet.java:143)
>>>        at org.apache.accumulo.server.tabletserver.Tablet$Scanner.read(Tablet.java:1883)
>>>        at org.apache.accumulo.server.tabletserver.TabletServer$ThriftClientHandler$NextBatchTask.run(TabletServer.java:905)
>>>        at org.apache.accumulo.cloudtrace.instrument.TraceRunnable.run(TraceRunnable.java:47)
>>>        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>>>        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>>>        ... 1 more
>>>
>>>
>>> So the error would seem to be related to reading past the end of the file. What
I can't determine is what is the reason. From examining the Accumulo source, it's clear that
Accumulo has read the length of a key (I think) and is now trying to read the key value. That
second read is what is failing. The question is why? Some ideas:
>>> 1) the file was originally written incorrectly by the writer,
>>> 2) the reader is reading too far
>>>
>>> This could be caused by a issue in Accumulo or in MapR. It might be that MapR
more strongly enforces end of file reads than stock Hadoop.
>>>
>>> If anyone has suggestions on how to look into this further from the Accumulo
side, I'd really appreciate it.
>>>
>>> Thanks,
>>> Keys
>>> ________________________________
>>> Keys Botzum
>>> Senior Principal Technologist
>>> WW Systems Engineering
>>> kbotzum@maprtech.com
>>> 443-718-0098
>>> MapR Technologies
>>> http://www.mapr.com
>

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