Alexander Sterligov created KYLIN-2749:
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Summary: Merge may remove merged segments before proper register
of merged segment
Key: KYLIN-2749
URL: https://issues.apache.org/jira/browse/KYLIN-2749
Project: Kylin
Issue Type: Bug
Affects Versions: v2.0.0
Reporter: Alexander Sterligov
Merge started to work on last 7 segments.
During the process hbase had a failure because of spot-instances shutdown in
Amazon. Data was not lost, because it is at S3.
I stopped kylin and did hbase hbck --repair. During the report of repair I
didn't see any information about lost data, just redistribution of regions.
Then after kylin was started I cannot query data from the last 7 query segments
with error:
{quote}
Caused by: java.lang.RuntimeException:
org.apache.hadoop.hbase.TableNotFoundException: Table 'KYLIN_7MMHCHKVVB' was
not found, got: KYLIN_7H3WSPX1UJ.
at com.google.common.base.Throwables.propagate(Throwables.java:160)
at
org.apache.kylin.storage.hbase.cube.v2.ExpectedSizeIterator.next(ExpectedSizeIterator.java:67)
at
org.apache.kylin.storage.hbase.cube.v2.ExpectedSizeIterator.next(ExpectedSizeIterator.java:31)
at
com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48)
at com.google.common.collect.Iterators$6.hasNext(Iterators.java:583)
at
org.apache.kylin.storage.gtrecord.SegmentCubeTupleIterator$2.hasNext(SegmentCubeTupleIterator.java:116)
at
org.apache.kylin.storage.gtrecord.SegmentCubeTupleIterator.hasNext(SegmentCubeTupleIterator.java:149)
at com.google.common.collect.Iterators$6.hasNext(Iterators.java:582)
at
org.apache.kylin.storage.gtrecord.SequentialCubeTupleIterator.hasNext(SequentialCubeTupleIterator.java:129)
at
org.apache.kylin.query.enumerator.OLAPEnumerator.moveNext(OLAPEnumerator.java:67)
at Baz$1$1.moveNext(Unknown Source)
at
org.apache.calcite.linq4j.EnumerableDefaults.groupBy_(EnumerableDefaults.java:826)
at
org.apache.calcite.linq4j.EnumerableDefaults.groupBy(EnumerableDefaults.java:761)
at
org.apache.calcite.linq4j.DefaultEnumerable.groupBy(DefaultEnumerable.java:302)
at Baz.bind(Unknown Source)
at
org.apache.calcite.jdbc.CalcitePrepare$CalciteSignature.enumerable(CalcitePrepare.java:331)
at
org.apache.calcite.jdbc.CalciteConnectionImpl.enumerable(CalciteConnectionImpl.java:294)
at
org.apache.calcite.jdbc.CalciteMetaImpl._createIterable(CalciteMetaImpl.java:553)
at
org.apache.calcite.jdbc.CalciteMetaImpl.createIterable(CalciteMetaImpl.java:544)
at
org.apache.calcite.avatica.AvaticaResultSet.execute(AvaticaResultSet.java:193)
at
org.apache.calcite.jdbc.CalciteResultSet.execute(CalciteResultSet.java:67)
at
org.apache.calcite.jdbc.CalciteResultSet.execute(CalciteResultSet.java:44)
at
org.apache.calcite.avatica.AvaticaConnection$1.execute(AvaticaConnection.java:607)
at
org.apache.calcite.jdbc.CalciteMetaImpl.prepareAndExecute(CalciteMetaImpl.java:600)
at
org.apache.calcite.avatica.AvaticaConnection.prepareAndExecuteInternal(AvaticaConnection.java:615)
at
org.apache.calcite.avatica.AvaticaStatement.executeInternal(AvaticaStatement.java:148)
... 77 more
Caused by: org.apache.hadoop.hbase.TableNotFoundException: Table
'KYLIN_7MMHCHKVVB' was not found, got: KYLIN_7H3WSPX1UJ.
at
org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegionInMeta(ConnectionManager.java:1310)
at
org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1189)
at
org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1173)
at
org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1130)
at
org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.getRegionLocation(ConnectionManager.java:965)
at
org.apache.hadoop.hbase.client.HRegionLocator.getRegionLocation(HRegionLocator.java:83)
at
org.apache.hadoop.hbase.client.HTable.getRegionLocation(HTable.java:505)
at
org.apache.hadoop.hbase.client.HTable.getKeysAndRegionsInRange(HTable.java:721)
at
org.apache.hadoop.hbase.client.HTable.getKeysAndRegionsInRange(HTable.java:691)
at
org.apache.hadoop.hbase.client.HTable.getStartKeysInRange(HTable.java:1796)
at
org.apache.hadoop.hbase.client.HTable.coprocessorService(HTable.java:1751)
at
org.apache.kylin.storage.hbase.cube.v2.CubeHBaseEndpointRPC$1.run(CubeHBaseEndpointRPC.java:182)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
... 1 more
{quote}
hbase really doesn't contain tables for the last 7 segments and I didn't call
any cleanup jobs.
It looks like Merge removed old segment tables, without ensuring that merged
segment is well presented in hbase.
I'm going to continue to investigate this problem and will post more details
next week.
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