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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2955) ant test fail for TestCrcCorruption with OutofMemory.
Date Thu, 06 Mar 2008 19:40:58 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2955?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12575850#action_12575850

Raghu Angadi commented on HADOOP-2955:

hmm.. DataNode used create this array even before HADOOP-2758 (at an earlier location). I
will check why this didn't show up there.

> ant test fail for TestCrcCorruption with OutofMemory.
> -----------------------------------------------------
>                 Key: HADOOP-2955
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2955
>             Project: Hadoop Core
>          Issue Type: Bug
>            Reporter: Mahadev konar
>            Assignee: Raghu Angadi
>            Priority: Blocker
> TestCrcCorruption sometimes corrupts the metadata for crc and leads to corruption in
the length of of bytes of checksum (second field in metadata). This does not happen always
but somtimes since corruption is random in the test.
> I put in a debug statement in the allocation to see how many bytes were being allocated
and ran it for few times. This is one of the allocation in 
> BlockSender:sendBlock() 
>  int maxChunksPerPacket = Math.max(1,
>                       (BUFFER_SIZE + bytesPerChecksum - 1)/bytesPerChecksum);
>         int sizeofPacket = PKT_HEADER_LEN + 
>         (bytesPerChecksum + checksumSize) * maxChunksPerPacket;
>         LOG.info("Comment: bytes to allocate " + sizeofPacket);
>         ByteBuffer pktBuf = ByteBuffer.allocate(sizeofPacket);
> The output in one of the allocations is 
>  dfs.DataNode (DataNode.java:sendBlock(1766)) - Comment: bytes to allocate 1232596786
> So we should check for number of bytes being allocated in sendBlock (should be less than
the block size? -- seems like a good default).

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