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https://issues.apache.org/jira/browse/HDFS-5343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13792392#comment-13792392
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Uma Maheswara Rao G commented on HDFS-5343:
-------------------------------------------
Below blockEnd is getting calculated based on block size. I think in
snapshotcases, FIleLength may be different when it was snapshotted. But if we
use blockSize , it may treat blocksize to read but snapshotted fileSize may be
less than this?
{code}
// update current position
if (updatePosition) {
pos = offset;
blockEnd = blk.getStartOffset() + blk.getBlockSize() - 1;
currentLocatedBlock = blk;
}
{code}
Where as direct read API uses fileLength
{code}
long filelen = getFileLength();
if ((position < 0) || (position >= filelen)) {
return -1;
}
int realLen = length;
if ((position + length) > filelen) {
realLen = (int)(filelen - position);
}
{code}
Do you think this is the cause for this unexpected bytes read?
> When cat command is issued on snapshot files getting unexpected result
> ----------------------------------------------------------------------
>
> Key: HDFS-5343
> URL: https://issues.apache.org/jira/browse/HDFS-5343
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client
> Reporter: sathish
> Assignee: sathish
>
> first if we create one file with some file length and take the snapshot of
> that file,and again append some data through append method to that file,then
> if we do cat command operation on snapshot of that file,in general it should
> dispaly the data what we added with create operation,but it is displaying the
> total data i.e. create +_ appended data.
> but if we do the same operation and if we read the contents of snapshot file
> through input stream it is just displaying the data created in snapshoted
> files.
> in this the behaviour of cat command and reading through inputstream is
> getting different
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