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From "Nemo Chen (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-10752) Several log refactoring/improvement suggestion in HDFS
Date Thu, 11 Aug 2016 19:08:21 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10752?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Nemo Chen updated HDFS-10752:
-----------------------------
    Description: 
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}

----
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.


  was:
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}


> 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
>              Labels: easyfix, easytest
>
> 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}
> ----
> 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.



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