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https://issues.apache.org/jira/browse/HDFS-12594?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shashikant Banerjee updated HDFS-12594:
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Attachment: HDFS-12594.008.patch
Thanks [~szetszwo] , for the review comments.
patch v8 addresses the same.
>>DFSUtilClient.bytes2byteArray and DFSUtil.bytes2byteArray are very similar
>>but there is a small difference when len == 0:
DFSUtilClient returns new byte[0][] and
DFSUtil returns new byte[][]{null}.
Is it a bug?
<<The mapping seems to be incorrect here:
EmptyString("") -> {}(byte[]) -> byte[][]{null};
Reverse Mapping:
byte[][]{null} -> byte[]{(byte) ("/") } ->String("/")
I have addressed the problems in conversion of byte[][] to byte[] . Please have
a look.
> SnapshotDiff - snapshotDiff fails if the snapshotDiff report exceeds the RPC
> response limit
> -------------------------------------------------------------------------------------------
>
> Key: HDFS-12594
> URL: https://issues.apache.org/jira/browse/HDFS-12594
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Reporter: Shashikant Banerjee
> Assignee: Shashikant Banerjee
> Attachments: HDFS-12594.001.patch, HDFS-12594.002.patch,
> HDFS-12594.003.patch, HDFS-12594.004.patch, HDFS-12594.005.patch,
> HDFS-12594.006.patch, HDFS-12594.007.patch, HDFS-12594.008.patch,
> SnapshotDiff_Improvemnets .pdf
>
>
> The snapshotDiff command fails if the snapshotDiff report size is larger than
> the configuration value of ipc.maximum.response.length which is by default
> 128 MB.
> Worst case, with all Renames ops in sanpshots each with source and target
> name equal to MAX_PATH_LEN which is 8k characters, this would result in at
> 8192 renames.
>
> SnapshotDiff is currently used by distcp to optimize copy operations and in
> case of the the diff report exceeding the limit , it fails with the below
> exception:
> Test set:
> org.apache.hadoop.hdfs.server.namenode.snapshot.TestSnapshotDiffReport
> -------------------------------------------------------------------------------
> Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 112.095 sec
> <<< FAILURE! - in
> org.apache.hadoop.hdfs.server.namenode.snapshot.TestSnapshotDiffReport
> testDiffReportWithMillionFiles(org.apache.hadoop.hdfs.server.namenode.snapshot.TestSnapshotDiffReport)
> Time elapsed: 111.906 sec <<< ERROR!
> java.io.IOException: Failed on local exception:
> org.apache.hadoop.ipc.RpcException: RPC response exceeds maximum data length;
> Host Details : local host is: "hw15685.local/10.200.5.230"; destination host
> is: "localhost":59808;
> Attached is the proposal for the changes required.
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