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https://issues.apache.org/jira/browse/HDFS-13246?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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liaoyuxiangqin updated HDFS-13246:
----------------------------------
Status: Patch Available (was: Open)
> FileInputStream redundant closes in readReplicasFromCache
> ----------------------------------------------------------
>
> Key: HDFS-13246
> URL: https://issues.apache.org/jira/browse/HDFS-13246
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 3.2.0
> Reporter: liaoyuxiangqin
> Priority: Major
> Attachments: HDFS-13246.001.patch
>
>
> When i read the readReplicasFromCache() of BlockPoolSlice class in datanode,
> I found the following code closes fileinputstream redundant, I think
> IOUtils.closeStream(inputStream) in finally code block could guarantee close
> the inputStream correctly, So the
> inputStream.close() can remove. Thanks.
>
> {code:java|title=BlockPoolSlice.java|borderStyle=solid}
> FileInputStream inputStream = null;
> try {
> inputStream = fileIoProvider.getFileInputStream(volume, replicaFile);
> BlockListAsLongs blocksList =
> BlockListAsLongs.readFrom(inputStream, maxDataLength);
> if (blocksList == null) {
> return false;
> }
> for (BlockReportReplica replica : blocksList) {
> switch (replica.getState()) {
> case FINALIZED:
> addReplicaToReplicasMap(replica, tmpReplicaMap,
> lazyWriteReplicaMap, true);
> break;
> case RUR:
> case RBW:
> case RWR:
> addReplicaToReplicasMap(replica, tmpReplicaMap,
> lazyWriteReplicaMap, false);
> break;
> default:
> break;
> }
> }
> inputStream.close();
> // Now it is safe to add the replica into volumeMap
> // In case of any exception during parsing this cache file, fall back
> // to scan all the files on disk.
> for (Iterator<ReplicaInfo> iter =
> tmpReplicaMap.replicas(bpid).iterator(); iter.hasNext(); ) {
> ReplicaInfo info = iter.next();
> // We use a lightweight GSet to store replicaInfo, we need to remove
> // it from one GSet before adding to another.
> iter.remove();
> volumeMap.add(bpid, info);
> }
> LOG.info("Successfully read replica from cache file : "
> + replicaFile.getPath());
> return true;
> } catch (Exception e) {
> // Any exception we need to revert back to read from disk
> // Log the error and return false
> LOG.info("Exception occurred while reading the replicas cache file: "
> + replicaFile.getPath(), e );
> return false;
> }
> finally {
> if (!fileIoProvider.delete(volume, replicaFile)) {
> LOG.info("Failed to delete replica cache file: " +
> replicaFile.getPath());
> }
> // close the inputStream
> IOUtils.closeStream(inputStream);
> }
> {code}
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