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Key: HADOOP-6148
Type: Improvement Improvement
Status: Resolved Resolved
Resolution: Fixed
Priority: Major Major
Assignee: Scott Carey
Reporter: Owen O'Malley
Votes: 0
Watchers: 14
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Hadoop Common

Implement a pure Java CRC32 calculator

Created: 31/Mar/09 12:17 PM   Updated: 23/Jul/09 01:55 AM
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Component/s: util
Affects Version/s: None
Fix Version/s: 0.21.0

Time Tracking:
Not Specified

File Attachments:
  File Name Date Attached Attached By Size
Text File Licensed for inclusion in ASF works benchmarks20090714.txt 2009-07-15 12:09 AM Tsz Wo (Nicholas), SZE 9 kB
Text File Licensed for inclusion in ASF works benchmarks20090715.txt 2009-07-15 06:53 PM Tsz Wo (Nicholas), SZE 12 kB
Text File Licensed for inclusion in ASF works crc32-results.txt 2009-06-14 06:33 AM Todd Lipcon 3 kB
Text File Licensed for inclusion in ASF works hadoop-5598-evil.txt 2009-06-16 01:01 AM Todd Lipcon 8 kB
Text File Licensed for inclusion in ASF works hadoop-5598-hybrid.txt 2009-06-14 07:51 AM Todd Lipcon 11 kB
Text File Licensed for inclusion in ASF works hadoop-5598.txt 2009-06-16 06:36 PM Todd Lipcon 7 kB
Text File Licensed for inclusion in ASF works hadoop-5598.txt 2009-06-14 06:33 AM Todd Lipcon 7 kB
Text File Licensed for inclusion in ASF works hadoop-6148.txt 2009-07-17 01:09 AM Todd Lipcon 25 kB
Text File Licensed for inclusion in ASF works hadoop-6148.txt 2009-07-16 10:55 PM Todd Lipcon 25 kB
Text File Licensed for inclusion in ASF works hadoop-6148.txt 2009-07-16 07:37 PM Todd Lipcon 25 kB
Text File Licensed for inclusion in ASF works hdfs-297.txt 2009-07-01 07:17 PM Todd Lipcon 19 kB
Java Source File Licensed for inclusion in ASF works PureJavaCrc32.java 2009-07-15 12:08 AM Tsz Wo (Nicholas), SZE 18 kB
Java Source File Licensed for inclusion in ASF works PureJavaCrc32.java 2009-06-18 07:47 PM Scott Carey 17 kB
Java Source File Licensed for inclusion in ASF works PureJavaCrc32.java 2009-06-18 05:40 PM Scott Carey 2 kB
Java Source File Licensed for inclusion in ASF works PureJavaCrc32.java 2009-06-17 10:57 PM Scott Carey 2 kB
Java Source File Licensed for inclusion in ASF works PureJavaCrc32New.java 2009-07-15 10:50 PM Scott Carey 16 kB
Java Source File Licensed for inclusion in ASF works PureJavaCrc32NewInner.java 2009-07-15 10:50 PM Scott Carey 16 kB
Java Source File Licensed for inclusion in ASF works PureJavaCrc32NewLoop.java 2009-07-15 10:50 PM Scott Carey 16 kB
Java Source File Licensed for inclusion in ASF works TestCrc32Performance.java 2009-07-15 10:51 PM Scott Carey 3 kB
Java Source File Licensed for inclusion in ASF works TestCrc32Performance.java 2009-06-18 07:47 PM Scott Carey 2 kB
Java Source File Licensed for inclusion in ASF works TestCrc32Performance.java 2009-06-14 07:51 AM Todd Lipcon 2 kB
Java Source File Licensed for inclusion in ASF works TestCrc32Performance.java 2009-06-14 06:33 AM Todd Lipcon 1 kB
Java Source File Licensed for inclusion in ASF works TestPureJavaCrc32.java 2009-06-18 07:47 PM Scott Carey 3 kB
Issue Links:
Reference

Hadoop Flags: Reviewed
Resolution Date: 17/Jul/09 02:19 AM


 Description  « Hide
We've seen a reducer writing 200MB to HDFS with replication = 1 spending a long time in crc calculation. In particular, it was spending 5 seconds in crc calculation out of a total of 6 for the write. I suspect that it is the java-jni border that is causing us grief.

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