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From Johannes Hoerle <johannes.hoe...@yoochoose.com>
Subject problems while TimeUUIDType-index-querying with two expressions
Date Mon, 14 Mar 2011 15:17:27 GMT
Hi all,

in order to improve our queries, we started to use IndexedSliceQueries from the hector project
(https://github.com/zznate/hector-examples). I followed the instructions for creating IndexedSlicesQuery
with GetIndexedSlices.java.
I created the corresponding CF with in a keyspace called "Keyspace1" ( "create keyspace  Keyspace1;")
with:
"create column family Indexed1 with column_type='Standard' and comparator='UTF8Type' and keys_cached=200000
and read_repair_chance=1.0 and rows_cached=20000 and column_metadata=[{column_name: birthdate,
validation_class: LongType, index_name: dateIndex, index_type: KEYS},{column_name: birthmonth,
validation_class: LongType, index_name: monthIndex, index_type: KEYS}];"
and the example GetIndexedSlices.java worked fine.

Output of CF Indexed1:
---------------------------------------
[default@Keyspace1] list Indexed1;
Using default limit of 100
-------------------
RowKey: fake_key_12
=> (column=birthdate, value=1974, timestamp=1300110485826059)
=> (column=birthmonth, value=0, timestamp=1300110485826060)
=> (column=fake_column_0, value=66616b655f76616c75655f305f3132, timestamp=1300110485826056)
=> (column=fake_column_1, value=66616b655f76616c75655f315f3132, timestamp=1300110485826057)
=> (column=fake_column_2, value=66616b655f76616c75655f325f3132, timestamp=1300110485826058)
-------------------
RowKey: fake_key_8
=> (column=birthdate, value=1974, timestamp=1300110485826039)
=> (column=birthmonth, value=8, timestamp=1300110485826040)
=> (column=fake_column_0, value=66616b655f76616c75655f305f38, timestamp=1300110485826036)
=> (column=fake_column_1, value=66616b655f76616c75655f315f38, timestamp=1300110485826037)
=> (column=fake_column_2, value=66616b655f76616c75655f325f38, timestamp=1300110485826038)
-------------------
....


Now to the problem:
As we have another column format in our cluster (using TimeUUIDType as comparator in CF definition)
I adapted the application to our schema on a cassandra-0.7.3 cluster.
We use a manually defined UUID for a mandator id index (00000000-0000-1000-0000-000000000000)
and another one for a userid index (00000001-0000-1000-0000-000000000000). It can be created
with:
"create column family ByUser with column_type='Standard' and comparator='TimeUUIDType' and
keys_cached=200000 and read_repair_chance=1.0 and rows_cached=20000 and column_metadata=[{column_name:
00000000-0000-1000-0000-000000000000, validation_class: BytesType, index_name: mandatorIndex,
index_type: KEYS}, {column_name: 00000001-0000-1000-0000-000000000000, validation_class: BytesType,
index_name: useridIndex, index_type: KEYS}];"


which looks in the cluster using cassandra-cli like this:

[default@Keyspace1] describe keyspace;
Keyspace: Keyspace1:
  Replication Strategy: org.apache.cassandra.locator.SimpleStrategy
    Replication Factor: 1
  Column Families:
    ColumnFamily: ByUser
      Columns sorted by: org.apache.cassandra.db.marshal.TimeUUIDType
      Row cache size / save period: 20000.0/0
      Key cache size / save period: 200000.0/14400
      Memtable thresholds: 0.2953125/63/1440
      GC grace seconds: 864000
      Compaction min/max thresholds: 4/32
      Read repair chance: 0.01
      Built indexes: [ByUser.mandatorIndex, ByUser.useridIndex]
      Column Metadata:
        Column Name: 00000001-0000-1000-0000-000000000000
          Validation Class: org.apache.cassandra.db.marshal.BytesType
          Index Name: useridIndex
          Index Type: KEYS
        Column Name: 00000000-0000-1000-0000-000000000000
          Validation Class: org.apache.cassandra.db.marshal.BytesType
          Index Name: mandatorIndex
          Index Type: KEYS
    ColumnFamily: Indexed1
      Columns sorted by: org.apache.cassandra.db.marshal.UTF8Type
      Row cache size / save period: 20000.0/0
      Key cache size / save period: 200000.0/14400
      Memtable thresholds: 0.2953125/63/1440
      GC grace seconds: 864000
      Compaction min/max thresholds: 4/32
      Read repair chance: 0.01
      Built indexes: [Indexed1.dateIndex, Indexed1.monthIndex]
      Column Metadata:
        Column Name: birthmonth (birthmonth)
          Validation Class: org.apache.cassandra.db.marshal.LongType
          Index Name: monthIndex
          Index Type: KEYS
        Column Name: birthdate (birthdate)
          Validation Class: org.apache.cassandra.db.marshal.LongType
          Index Name: dateIndex
          Index Type: KEYS
[default@Keyspace1] list ByUser;
Using default limit of 100
-------------------
RowKey: testMandator!!user01
=> (column=00000000-0000-1000-0000-000000000000, value=746573744d616e6461746f72, timestamp=1300111213321000)
=> (column=00000001-0000-1000-0000-000000000000, value=757365723031, timestamp=1300111213322000)
=> (column=f064b480-495e-11e0-abc4-0024e89fa587, value=3135, timestamp=1300111213561000)

1 Row Returned.

the values of the index colums 00000000-0000-1000-0000-000000000000 and 00000001-0000-1000-0000-000000000000
represent "testMandator" and and "user01" as bytes
the third column is a randomly generated one with value "15" that are inserted in GetTimeUUIDIndexedSlices
app.
I attached both source codes, GetIndexedSlices and GetTimeUUIDIndexedSlices. Currently the
second index expression for the userid index in GetTimeUUIDIndexedSlices.queryCf(...) method

            indexQuery.addEqualsExpression(asByteArray(MANDATOR_UUID), new StringSerializer().toBytes(mandator));
        //indexQuery.addEqualsExpression(asByteArray(USERID_INDEX_UUID), new StringSerializer().toBytes(dummyUserId));

is commented out, so the GetTimeUUIDIndexedSlices will run. Using one IndexQuery works perfectly
fine but as soon as I add a second eq, gt, gte or lt expression I get an IndexOutOfBoundsException
(see below).

This issue can be easily reproduced by
- downloading the zznate example (https://github.com/zznate/hector-examples),
- mavenizing it to an eclipse project with "mvn clean eclipse:eclipse",
- importing it in eclipse and
- letting it run against a locally running cassandra instance (v0.7.3) which has the default
settings (no changes in the .yaml)

I hope that someone can help me with this issue ... after a couple of days it's driving me
bonkers.

Thx in advance,
Johannes


Exception:
ERROR 14:47:56,842 Error in ThreadPoolExecutor
java.lang.RuntimeException: java.lang.IndexOutOfBoundsException: 6
        at org.apache.cassandra.service.IndexScanVerbHandler.doVerb(IndexScanVer
bHandler.java:51)
        at org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.
java:72)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExec
utor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor
.java:908)
        at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.IndexOutOfBoundsException: 6
        at java.nio.HeapByteBuffer.get(HeapByteBuffer.java:121)
        at org.apache.cassandra.db.marshal.TimeUUIDType.compareTimestampBytes(Ti
meUUIDType.java:56)
        at org.apache.cassandra.db.marshal.TimeUUIDType.compare(TimeUUIDType.jav
a:45)
        at org.apache.cassandra.db.marshal.TimeUUIDType.compare(TimeUUIDType.jav
a:29)
        at org.apache.cassandra.db.ColumnFamilyStore.satisfies(ColumnFamilyStore
.java:1608)
        at org.apache.cassandra.db.ColumnFamilyStore.scan(ColumnFamilyStore.java
:1552)
        at org.apache.cassandra.service.IndexScanVerbHandler.doVerb(IndexScanVer
bHandler.java:42)
        ... 4 more
ERROR 14:47:56,852 Fatal exception in thread Thread[ReadStage:14,5,main]
java.lang.RuntimeException: java.lang.IndexOutOfBoundsException: 6
        at org.apache.cassandra.service.IndexScanVerbHandler.doVerb(IndexScanVer
bHandler.java:51)
        at org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.
java:72)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExec
utor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor
.java:908)
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