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https://issues.apache.org/jira/browse/HAMA-531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13281486#comment-13281486
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Edward J. Yoon commented on HAMA-531:
-------------------------------------
It seems there's a bug in partitioning.
{code}
edward@slave:~/workspace/hama-trunk$ bin/hama jar
examples/target/hama-examples-0.5.0-incubating-SNAPSHOT.jar sssp 3
/user/edward/data/part-r-00000 output 3
12/05/23 18:46:33 DEBUG bsp.BSPJobClient: BSPJobClient.submitJobDir:
hdfs://slave.udanax.org:9001/tmp/hadoop-edward/bsp/system/submit_mue8lf
12/05/23 18:46:33 DEBUG bsp.BSPJobClient: Creating splits at
hdfs://slave.udanax.org:9001/tmp/hadoop-edward/bsp/system/submit_mue8lf/job.split
12/05/23 18:46:33 INFO bsp.FileInputFormat: Total input paths to process : 1
12/05/23 18:46:33 DEBUG bsp.FileInputFormat: computeSplitSize: 70724 (70724,
2000, 67108864)
12/05/23 18:46:33 INFO bsp.FileInputFormat: Total # of splits: 3
12/05/23 18:46:33 INFO bsp.BSPJobClient: Running job: job_201205231839_0009
12/05/23 18:46:36 INFO bsp.BSPJobClient: Current supersteps number: 0
12/05/23 18:46:39 INFO bsp.BSPJobClient: Current supersteps number: 12
12/05/23 18:46:39 INFO bsp.BSPJobClient: The total number of supersteps: 12
12/05/23 18:46:39 DEBUG bsp.Counters: Adding SUPERSTEPS
12/05/23 18:46:39 INFO bsp.BSPJobClient: Counters: 10
12/05/23 18:46:39 INFO bsp.BSPJobClient:
org.apache.hama.bsp.JobInProgress$JobCounter
12/05/23 18:46:39 INFO bsp.BSPJobClient: LAUNCHED_TASKS=3
12/05/23 18:46:39 INFO bsp.BSPJobClient:
org.apache.hama.bsp.BSPPeerImpl$PeerCounter
12/05/23 18:46:39 INFO bsp.BSPJobClient: SUPERSTEPS=12
12/05/23 18:46:39 INFO bsp.BSPJobClient: COMPRESSED_BYTES_SENT=27902
12/05/23 18:46:39 INFO bsp.BSPJobClient: SUPERSTEP_SUM=36
12/05/23 18:46:39 INFO bsp.BSPJobClient: TIME_IN_SYNC_MS=4369
12/05/23 18:46:39 INFO bsp.BSPJobClient: IO_BYTES_READ=212069
12/05/23 18:46:39 INFO bsp.BSPJobClient: COMPRESSED_BYTES_RECEIVED=27902
12/05/23 18:46:39 INFO bsp.BSPJobClient: TOTAL_MESSAGES_SENT=4374
12/05/23 18:46:39 INFO bsp.BSPJobClient: TASK_INPUT_RECORDS=100
12/05/23 18:46:39 INFO bsp.BSPJobClient: TOTAL_MESSAGES_RECEIVED=2187
Job Finished in 6.517 seconds
edward@slave:~/workspace/hama-trunk$ bin/hama jar
examples/target/hama-examples-0.5.0-incubating-SNAPSHOT.jar sssp 3
/user/edward/data/part-r-00000 output 4
12/05/23 18:46:44 DEBUG bsp.BSPJobClient: BSPJobClient.submitJobDir:
hdfs://slave.udanax.org:9001/tmp/hadoop-edward/bsp/system/submit_a44pqb
12/05/23 18:46:44 DEBUG bsp.BSPJobClient: Creating splits at
hdfs://slave.udanax.org:9001/tmp/hadoop-edward/bsp/system/submit_a44pqb/job.split
12/05/23 18:46:44 INFO bsp.FileInputFormat: Total input paths to process : 1
12/05/23 18:46:44 DEBUG bsp.FileInputFormat: computeSplitSize: 53043 (53043,
2000, 67108864)
12/05/23 18:46:44 INFO bsp.FileInputFormat: Total # of splits: 4
12/05/23 18:46:44 INFO bsp.BSPJobClient: Running job: job_201205231839_0010
12/05/23 18:46:47 INFO bsp.BSPJobClient: Current supersteps number: 0
12/05/23 18:46:56 INFO bsp.BSPJobClient: Job failed.
{code}
> Data re-partitioning in BSPJobClient
> ------------------------------------
>
> Key: HAMA-531
> URL: https://issues.apache.org/jira/browse/HAMA-531
> Project: Hama
> Issue Type: Improvement
> Reporter: Edward J. Yoon
> Assignee: Thomas Jungblut
> Attachments: HAMA-531_1.patch, HAMA-531_2.patch, HAMA-531_final.patch
>
>
> The re-partitioning the data is a very expensive operation. By the way,
> currently, we processes read/write operations sequentially using HDFS api in
> BSPJobClient from client-side. This causes potential too many open files
> error, contains HDFS overheads, and shows slow performance.
> We have to find another way to re-partitioning data.
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