Quanlong Huang created IMPALA-12856:
---------------------------------------
Summary: IllegalStateException in processing RELOAD events due to
malformed HMS Partition objects
Key: IMPALA-12856
URL: https://issues.apache.org/jira/browse/IMPALA-12856
Project: IMPALA
Issue Type: Bug
Components: Catalog
Reporter: Quanlong Huang
When processing RELOAD events on partitions, catalogd fetch the Partition
objects from HMS. The returned Partition objects could be malformed which
causes an IllegalStateException and stops the event-processor. This was
observed when a partition is added and dropped in a loop.
{noformat}
E0229 15:19:27.945312 12668 MetastoreEventsProcessor.java:990] Unexpected
exception received while processing event
Java exception follows:
java.lang.IllegalStateException
at
com.google.common.base.Preconditions.checkState(Preconditions.java:496)
at
org.apache.impala.catalog.HdfsTable.getTypeCompatiblePartValues(HdfsTable.java:2598)
at
org.apache.impala.catalog.HdfsTable.reloadPartitionsFromNames(HdfsTable.java:2856)
at
org.apache.impala.service.CatalogOpExecutor.reloadPartitionsFromNamesIfExists(CatalogOpExecutor.java:4805)
at
org.apache.impala.service.CatalogOpExecutor.reloadPartitionsIfExist(CatalogOpExecutor.java:4742)
at
org.apache.impala.catalog.events.MetastoreEvents$MetastoreTableEvent.reloadPartitions(MetastoreEvents.java:1050)
at
org.apache.impala.catalog.events.MetastoreEvents$ReloadEvent.processPartitionReload(MetastoreEvents.java:2941)
at
org.apache.impala.catalog.events.MetastoreEvents$ReloadEvent.processTableEvent(MetastoreEvents.java:2906)
at
org.apache.impala.catalog.events.MetastoreEvents$MetastoreTableEvent.process(MetastoreEvents.java:1248)
at
org.apache.impala.catalog.events.MetastoreEvents$MetastoreEvent.processIfEnabled(MetastoreEvents.java:672)
at
org.apache.impala.catalog.events.MetastoreEventsProcessor.processEvents(MetastoreEventsProcessor.java:1164)
at
org.apache.impala.catalog.events.MetastoreEventsProcessor.processEvents(MetastoreEventsProcessor.java:972)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:750)
E0229 15:19:27.963455 12668 MetastoreEventsProcessor.java:1251] Event id:
8697728
Event Type: RELOAD
Event time: 1709191166
Database name: default
Table name: part_tbl
Event message: H4s{noformat}
The failed check is asserting the number of partition columns cached in
catalogd matches the number of partition values from the HMS object:
{code:java}
public List<LiteralExpr> getTypeCompatiblePartValues(List<String> values) {
List<LiteralExpr> result = new ArrayList<>();
List<Column> partitionColumns = getClusteringColumns();
Preconditions.checkState(partitionColumns.size() == values.size()); // This
failed{code}
After adding some debug logs, I found the Partition obejct got from HMS had an
empty values list:
{noformat}
I0229 16:04:04.679625 25867 HdfsTable.java:2829] HMS Partition:
Partition(values:[], dbName:default, tableName:part_tbl, createTime:1709193844,
lastAccessTime:0, sd:StorageDescriptor(cols:[FieldSchema(name:i, type:int,
comment:null)], location:hdf
s://localhost:20500/test-warehouse/part_tbl/p=1,
inputFormat:org.apache.hadoop.mapred.TextInputFormat,
outputFormat:org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat,
compressed:false, numBuckets:0, serdeInfo:SerDeInfo(name:null, serializ
ationLib:org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, parameters:{}),
bucketCols:[], sortCols:[], parameters:{},
skewedInfo:SkewedInfo(skewedColNames:[], skewedColValues:[],
skewedColValueLocationMaps:{}), storedAsSubDirectories:false), par
ameters:{}, catName:hive, writeId:0)
I0229 16:04:04.680133 25867 MetastoreEventsProcessor.java:1189] Time elapsed in
processing event batch: 17.145ms
E0229 16:04:04.680475 25867 MetastoreEventsProcessor.java:990] Unexpected
exception received while processing event
Java exception follows:
java.lang.IllegalStateException: partitionColumns.size(): 1, values.size(): 0.
partCols: Column{name_=p, type_=INT, comment_=null,
stats=ColumnStats{avgSize_=4.0, avgSerializedSize_=4.0, maxSize_=4,
numDistinct_=-1, numNulls_=-1, numTrues=-1, numFalses=-1, lowValue=-1,
highValue=-1}, position_=0}, partValues: {noformat}
EventProcessor should recover in this case.
On the other hand, returning a Partition object with empty partition value list
seems a bug of HMS. CC [~hemanth619], [~VenuReddy]
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