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Posted to hdfs-issues@hadoop.apache.org by "Shashikant Banerjee (JIRA)" <ji...@apache.org> on 2017/11/08 16:52:00 UTC
[jira] [Updated] (HDFS-12594) SnapshotDiff - snapshotDiff fails if
the snapshotDiff report exceeds the RPC response limit
[ https://issues.apache.org/jira/browse/HDFS-12594?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Shashikant Banerjee updated HDFS-12594:
---------------------------------------
Attachment: HDFS-12594.005.patch
Thanks [~szetszwo], for the review.
Patch v5 addresses the review comments.
> 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, 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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