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https://issues.apache.org/jira/browse/HDFS-10752?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Arpit Agarwal updated HDFS-10752:
---------------------------------
Resolution: Fixed
Hadoop Flags: Reviewed
Fix Version/s: 3.0.0-alpha2
2.8.0
Status: Resolved (was: Patch Available)
Committed for 2.8.0. Thanks for the contribution [~hanishakoneru]!
> Several log refactoring/improvement suggestion in HDFS
> ------------------------------------------------------
>
> Key: HDFS-10752
> URL: https://issues.apache.org/jira/browse/HDFS-10752
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.7.2
> Reporter: Nemo Chen
> Assignee: Hanisha Koneru
> Labels: easyfix, easytest
> Fix For: 2.8.0, 3.0.0-alpha2
>
> Attachments: HDFS-10752.000.patch
>
>
> As per conversation with [~vrushalic], we merged HDFS-10749, HDFS-10750,
> HDFS-10751, HDFS-10753, under this issue.
> ----
> HDFS-10749
> *Method invocation in logs can be replaced by variable*
> Similar to the fix for HDFS-409. In file:
> hadoop-rel-release-2.7.2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSOutputStream.java
> In code block:
> {code:borderStyle=solid}
> lastQueuedSeqno = currentPacket.getSeqno();
> if (DFSClient.LOG.isDebugEnabled()) {
> DFSClient.LOG.debug("Queued packet " + currentPacket.getSeqno());
> }
> {code}
> currentPacket.getSeqno() is better to be replaced by variable lastQueuedSeqno.
> ----
> HDFS-10750
> Similar to the fix for AVRO-115. In file:
> hadoop-rel-release-2.7.2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNode.java
> in line 695, the logging code:
> {code:borderStyle=solid}
> LOG.info(getRole() + " RPC up at: " + rpcServer.getRpcAddress());
> {code}
> In the same class, there is a method in line 907:
> {code:borderStyle=solid}
> /**
> * @return NameNode RPC address
> */
> public InetSocketAddress getNameNodeAddress() {
> return rpcServer.getRpcAddress();
> }
> {code}
> We can tell that rpcServer.getRpcAddress() could be replaced by method
> getNameNodeAddress() for the case of readability and simplicity
> ----
> HDFS-10751
> Similar to the fix for AVRO-115. In file:
> hadoop-rel-release-2.7.2/hadoop-hdfs-project/hadoop-hdfs-nfs/src/main/java/org/apache/hadoop/hdfs/nfs/nfs3/OpenFileCtxCache.java
> in line 72, the logging code:
> {code:borderStyle=solid}
> LOG.trace("openFileMap size:" + openFileMap.size());
> {code}
> In the same class, there is a method in line 189:
> {code:borderStyle=solid}
> int size() {
> return openFileMap.size();
> }
> {code}
> We can tell that openFileMap.size() could be replaced by method size() for
> the case of readability and simplicity
> ----
> *Print variable in byte*
> Similar to the fix for HBASE-623, in file:
> hadoop-rel-release-2.7.2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/BackupImage.java
> In the following method, the log printed variable data (in byte[]). A
> possible fix is add Bytes.toString(data).
> {code}
> /**
> * Write the batch of edits to the local copy of the edit logs.
> */
> private void logEditsLocally(long firstTxId, int numTxns, byte[] data) {
> long expectedTxId = editLog.getLastWrittenTxId() + 1;
> Preconditions.checkState(firstTxId == expectedTxId,
> "received txid batch starting at %s but expected txn %s",
> firstTxId, expectedTxId);
> editLog.setNextTxId(firstTxId + numTxns - 1);
> editLog.logEdit(data.length, data);
> editLog.logSync();
> }
> {code}
> ----
> ----
> HDFS-10753
> *MethodInvocation replaced by variable due to toString method*
> Similar to the fix in HADOOP-6419, in file:
> hadoop-rel-release-2.7.2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/CorruptReplicasMap.java
> in line 76, the blk.getBlockName() method invocation is invoked on variable
> blk. "blk" is the class instance of Block.
> {code}
> void addToCorruptReplicasMap(Block blk, DatanodeDescriptor dn,
> String reason, Reason reasonCode) {
> ...
> NameNode.blockStateChangeLog.info(
> "BLOCK NameSystem.addToCorruptReplicasMap: {} added as corrupt on "
> + "{} by {} {}", blk.getBlockName(), dn, Server.getRemoteIp(),
> reasonText);
> {code}
> In file:
> hadoop-rel-release-2.7.2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/Block.java
> {code}
> @Override
> public String toString() {
> return getBlockName() + "_" + getGenerationStamp();
> }
> {code}
> The toString() method contain not only getBlockName() but also
> getGenerationStamp which may be helpful for debugging purpose. Therefore
> blk.getBlockName() can be replaced by blk
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