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https://issues.apache.org/jira/browse/HDFS-15442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17243964#comment-17243964
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Ayush Saxena commented on HDFS-15442:
-------------------------------------
[~AMC-team] there are checkstyle warnings, can you fix them
https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/327/artifact/out/diff-checkstyle-hadoop-hdfs-project_hadoop-hdfs.txt
> Image upload may fail if dfs.image.transfer.chunksize wrongly set to negative
> value
> -----------------------------------------------------------------------------------
>
> Key: HDFS-15442
> URL: https://issues.apache.org/jira/browse/HDFS-15442
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: AMC-team
> Assignee: AMC-team
> Priority: Major
> Attachments: HDFS-15442.000.patch
>
>
> In current implementation of checkpoint image transfer, if the file length is
> bigger than the configured value dfs.image.transfer.chunksize, it will use
> chunked streaming mode to avoid internal buffering. This mode should be used
> only if more than chunkSize data is present to upload, otherwise upload may
> not happen sometimes.
> {code:java}
> //TransferFsImage.java
> int chunkSize = (int) conf.getLongBytes(
> DFSConfigKeys.DFS_IMAGE_TRANSFER_CHUNKSIZE_KEY,
> DFSConfigKeys.DFS_IMAGE_TRANSFER_CHUNKSIZE_DEFAULT);
> if (imageFile.length() > chunkSize) {
> // using chunked streaming mode to support upload of 2GB+ files and to
> // avoid internal buffering.
> // this mode should be used only if more than chunkSize data is present
> // to upload. otherwise upload may not happen sometimes.
> connection.setChunkedStreamingMode(chunkSize);
> }
> {code}
> There is no check code for this parameter. User may accidentally set this
> value to a wrong value. Here, if the user set chunkSize to a negative value.
> Chunked streaming mode will always be used. In
> setChunkedStreamingMode(chunkSize), there is a correction code that if the
> chunkSize is <=0, it will be change to DEFAULT_CHUNK_SIZE.
> {code:java}
> public void setChunkedStreamingMode (int chunklen) {
> if (connected) {
> throw new IllegalStateException ("Can't set streaming mode: already
> connected");
> }
> if (fixedContentLength != -1 || fixedContentLengthLong != -1) {
> throw new IllegalStateException ("Fixed length streaming mode set");
> }
> chunkLength = chunklen <=0? DEFAULT_CHUNK_SIZE : chunklen;
> }
> {code}
> However,
> *If the user set dfs.image.transfer.chunksize to value that <= 0, even for
> images whose imageFile.length() < DEFAULT_CHUNK_SIZE will use chunked
> streaming mode and may fail the upload as mentioned above.* *(This scenario
> may not be common, but* *we can prevent users setting this param to an
> extremely small value.**)*
> *How to fix:*
> Add checking code or correction code right after parsing the config value
> before really use the value (setChunkedStreamingMode).
>
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