Prasanth Jayachandran created HIVE-13361:
--------------------------------------------
Summary: Orc concatenation should enforce the compression buffer
size
Key: HIVE-13361
URL: https://issues.apache.org/jira/browse/HIVE-13361
Project: Hive
Issue Type: Bug
Affects Versions: 2.0.0, 1.3.0, 2.1.0
Reporter: Prasanth Jayachandran
Assignee: Prasanth Jayachandran
Priority: Critical
With HIVE-11807 buffer size estimation happens by default. This can have
undesired effect wrt file concatenation. Consider the following table with files
{code}
testtable
-- 000000_0 (created before HIVE-11807 which has buffer size 256KB)
-- 000001_0 (created before HIVE-11807 which has buffer size 256KB)
-- 000002_0 (created after HIVE-11807 with buffer size chosen as 128KB)
-- 000003_0 (created after HIVE-11807 with buffer size chosen as 128KB)
{code}
If we perform ALTER TABLE .. CONCATENATE on the above table with HIVE-11807,
then depending on the split arrangement 000000_0 and 000001_0 will be
concatenated together to new merged file. But this new merged file will have
128KB buffer size (estimated buffer size and not requested buffer size). Since
new ORC writer size does not honor the requested buffer size the new merged
files will have smaller buffers than the required 256KB making the file
unreadable. Following exception will be thrown when reading the table after
concatenation
{code}
2016-03-24T16:26:33,974 ERROR [a9e27a9a-37cb-411d-9708-6c58a4ce34f2 main]:
CliDriver (SessionState.java:printError(1049)) - Failed with exception
java.io.IOException:java.lang.IllegalArgumentException: Buffer size too small.
size = 131072 needed = 153187
java.io.IOException: java.lang.IllegalArgumentException: Buffer size too small.
size = 131072 needed = 153187
at
org.apache.hadoop.hive.ql.exec.FetchOperator.getNextRow(FetchOperator.java:513)
at
org.apache.hadoop.hive.ql.exec.FetchOperator.pushRow(FetchOperator.java:420)
at org.apache.hadoop.hive.ql.exec.FetchTask.fetch(FetchTask.java:145)
at org.apache.hadoop.hive.ql.Driver.getResults(Driver.java:1848)
at
org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:256)
at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:187)
at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:403)
at
org.apache.hadoop.hive.cli.CliDriver.executeDriver(CliDriver.java:782)
at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:721)
at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:648)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.apache.hadoop.util.RunJar.run(RunJar.java:221)
at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
{code}
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