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https://issues.apache.org/jira/browse/HADOOP-4388?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Suresh Srinivas updated HADOOP-4388:
------------------------------------
Attachment: HADOOP-4388.patch
Attached patch removes breaking out of "for" loop on encountering bad block.
With this change, the bad block is ignored and the remaining blocks are
transferred from one Datanode to another.
> Bug in Datanode transferBlocks code
> -----------------------------------
>
> Key: HADOOP-4388
> URL: https://issues.apache.org/jira/browse/HADOOP-4388
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.17.0
> Reporter: Suresh Srinivas
> Assignee: Suresh Srinivas
> Fix For: 0.20.0
>
> Attachments: HADOOP-4388.patch
>
>
> In the following code, when the blocks to be transferred has an invalid
> block, all the blocks that follow it are also not transferred. That might not
> be the intended behavior. Instead of breaking out of the loop, perhaps the
> right thing to do is to ignore the invalid block and continue with
> transferring the rest.
> {noformat}
> private void transferBlocks( Block blocks[],
> DatanodeInfo xferTargets[][]
> ) throws IOException {
> for (int i = 0; i < blocks.length; i++) {
> if (!data.isValidBlock(blocks[i])) {
> String errStr = "Can't send invalid block " + blocks[i];
> LOG.info(errStr);
> namenode.errorReport(dnRegistration,
> DatanodeProtocol.INVALID_BLOCK,
> errStr);
> //
> // ******** This should be continue instead of break?
> //
> break;
> }
> int numTargets = xferTargets[i].length;
> if (numTargets > 0) {
> if (LOG.isInfoEnabled()) {
> StringBuilder xfersBuilder = new StringBuilder();
> for (int j = 0; j < numTargets; j++) {
> DatanodeInfo nodeInfo = xferTargets[i][j];
> xfersBuilder.append(nodeInfo.getName());
> if (j < (numTargets - 1)) {
> xfersBuilder.append(", ");
> }
> }
> String xfersTo = xfersBuilder.toString();
> LOG.info(dnRegistration + " Starting thread to transfer block " +
> blocks[i] + " to " + xfersTo);
> }
> new Daemon(new DataTransfer(xferTargets[i], blocks[i], this)).start();
> }
> }
> }
> {noformat}
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