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From "Vladimir Rodionov (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-10194) FSDataOutputStream.write() allocates new byte buffer on each operation
Date Tue, 22 Mar 2016 23:31:25 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10194?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vladimir Rodionov resolved HDFS-10194.
--------------------------------------
    Resolution: Invalid

HDFS-7276 provides ByteArrayManager which is off, by default. Enabling this feature resolves
the issue.

> FSDataOutputStream.write() allocates new byte buffer on each operation
> ----------------------------------------------------------------------
>
>                 Key: HDFS-10194
>                 URL: https://issues.apache.org/jira/browse/HDFS-10194
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs-client
>    Affects Versions: 2.7.1
>            Reporter: Vladimir Rodionov
>
> This is the code:
> {code}
>  private DFSPacket createPacket(int packetSize, int chunksPerPkt, long offsetInBlock,
long seqno, boolean lastPacketInBlock) throws InterruptedIOException {
>      final byte[] buf;
>      final int bufferSize = PacketHeader.PKT_MAX_HEADER_LEN +   packetSize;
>  
>      try {
>        buf = byteArrayManager.newByteArray(bufferSize);
>      } catch (InterruptedException ie) {
>        final InterruptedIOException iioe = new InterruptedIOException(
>            "seqno=" + seqno);
>        iioe.initCause(ie);
>        throw iioe;
>      }
>  
>      return new DFSPacket(buf, chunksPerPkt, offsetInBlock, seqno,
>                           getChecksumSize(), lastPacketInBlock);
> }
> {code}



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