✎ ISSUE: [ChunkedOutputStream.FlushData.execute Failed to flush buffer to this destination [Ahsay Wiki]

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=====  ISSUE: [ChunkedOutputStream.FlushData.execute Failed to flush buffer to this destination   =====

<html>
 <b>
  Article ID:
 </b>
 5231
 <br/>
 <b>
  Reviewed:
 </b>
 02/03/2017
 <br/>
 <br/>
 <b>
  Product Version:
 </b>
 <br/>
 AhsayOBM / AhsayACB: 7.9.2.0 or above
 <br/>
 OS: All platforms
</html>


===== Problem Description =====
<html>
 When performing a backup job of any type, the following error is receieved in the backup log:
 <br/>
 <table 800"="" border="0" cellpadding="0" cellspacing="0" width="850">
  <tr>
   <td bgcolor="#E8E8E8" style="BORDER-LEFT: #C0C0C0 1px solid; BORDER-TOP: #C0C0C0  1px solid; BORDER-BOTTOM: #C0C0C0 1px solid" valign="middle">
    No.
   </td>
   <td bgcolor="#E8E8E8" style="BORDER-LEFT: #C0C0C0 1px solid; BORDER-TOP: #C0C0C0  1px solid; BORDER-BOTTOM: #C0C0C0 1px solid" valign="middle">
    Type
   </td>
   <td bgcolor="#E8E8E8" style="BORDER-LEFT: #C0C0C0 1px solid; BORDER-TOP: #C0C0C0  1px solid; BORDER-BOTTOM: #C0C0C0 1px solid" valign="middle">
    Timestamp
   </td>
   <td bgcolor="#E8E8E8" style="BORDER-LEFT: #C0C0C0 1px solid; BORDER-TOP: #C0C0C0 1px solid; BORDER-RIGHT: #C0C0C0 1px solid; BORDER-BOTTOM: #C0C0C0 1px solid" valign="middle">
    Log
   </td>
  </tr>
  <tr>
   <td bgcolor="#ffffff" style="BORDER-LEFT: #C0C0C0 1px solid; BORDER-BOTTOM: #C0C0C0 1px solid" valign="top">
    *
   </td>
   <td bgcolor="#ffffff" style="BORDER-LEFT: #C0C0C0 1px solid; BORDER-BOTTOM: #C0C0C0 1px solid" valign="top">
    ...
   </td>
   <td bgcolor="#ffffff" style="BORDER-LEFT: #C0C0C0 1px solid; BORDER-BOTTOM: #C0C0C0 1px solid" valign="top">
    ...
   </td>
   <td bgcolor="#ffffff" style="BORDER-LEFT: #C0C0C0 1px solid; BORDER-RIGHT: #C0C0C0 1px solid; BORDER-BOTTOM: #C0C0C0 1px solid" valign="middle">
    ...
   </td>
  </tr>
  <tr>
   <td bgcolor="#ffffff" style="BORDER-LEFT: #C0C0C0 1px solid; BORDER-BOTTOM: #C0C0C0 1px solid" valign="top">
    *
   </td>
   <td bgcolor="#ffffff" style="BORDER-LEFT: #C0C0C0 1px solid; BORDER-BOTTOM: #C0C0C0 1px solid" valign="top">
    info
   </td>
   <td bgcolor="#ffffff" style="BORDER-LEFT: #C0C0C0 1px solid; BORDER-BOTTOM: #C0C0C0 1px solid" valign="top">
    ...
   </td>
   <td bgcolor="#ffffff" style="BORDER-LEFT: #C0C0C0 1px solid; BORDER-RIGHT: #C0C0C0 1px solid; BORDER-BOTTOM: #C0C0C0 1px solid" valign="middle">
    ...
   </td>
  </tr>
  <tr>
   <td bgcolor="#ffffff" style="BORDER-LEFT: #C0C0C0 1px solid; BORDER-BOTTOM: #C0C0C0 1px solid" valign="top">
    *
   </td>
   <td bgcolor="#ffffff" style="BORDER-LEFT: #C0C0C0 1px solid; BORDER-BOTTOM: #C0C0C0 1px solid" valign="top">
    <font color="#FF0000">
     erro
    </font>
   </td>
   <td bgcolor="#ffffff" style="BORDER-LEFT: #C0C0C0 1px solid; BORDER-BOTTOM: #C0C0C0 1px solid" valign="top">
    <font color="#FF0000">
     YYYY/MM/DD
     hh:mm:ss
    </font>
   </td>
   <td bgcolor="#ffffff" style="BORDER-LEFT: #C0C0C0 1px solid; BORDER-RIGHT: #C0C0C0 1px solid; BORDER-BOTTOM: #C0C0C0 1px solid" valign="middle">
    <font color="#FF0000">
     Error="ChunkedOutputStream.FlushData.execute]  Failed to flush buffer (directory_path\vm_name-flat.vmdk)<br>
     to this destination. Error='java.io.IOException: [FastPipedOutputStream.write]FastPipedOutputStream has<br>
     been closed by the reading thread.', caused by [IOException][FastPipedOutputStream.write]<br>
     FastPipedOutputStream has been closed by the reading thread."
     <br/>
    </font>
   </td>
  </tr>
  <tr>
   <td bgcolor="#ffffff" style="BORDER-LEFT: #C0C0C0 1px solid; BORDER-BOTTOM: #C0C0C0 1px solid" valign="top">
    *
   </td>
   <td bgcolor="#ffffff" style="BORDER-LEFT: #C0C0C0 1px solid; BORDER-BOTTOM: #C0C0C0 1px solid" valign="top">
    ...
   </td>
   <td bgcolor="#ffffff" style="BORDER-LEFT: #C0C0C0 1px solid; BORDER-BOTTOM: #C0C0C0 1px solid" valign="top">
    ...
   </td>
   <td bgcolor="#ffffff" style="BORDER-LEFT: #C0C0C0 1px solid; BORDER-RIGHT: #C0C0C0 1px solid; BORDER-BOTTOM: #C0C0C0 1px solid" valign="middle">
    ...
   </td>
  </tr>
 </table>
</html>

===== Cause =====
This issue is caused by an unstable network connection between the AhsayOBM / ACB client machine and the backup destination (e.g. AhsayCBS server or Cloud storage service).



===== Resolution =====
<html>
Please try tuning the timeout and retry parameters on AhsayOBM / ACB to workaround the unstable network connection issue. &nbsp;Increase the number of retry and or read timeout value, this can be done by editing the ${OBC_Install_Home}\afc.opt file.
 <br/>
 <br/>
 <u>
  Parameter Description:
 </u>
 <br/>
 <ul>
  <li><font color="black">
   com.ahsay.afc.bfs.cloud.ChunkedOutputStream.retry
   <br/>
   <br/>
   The number of times AhsayOBM / ACB would retry to send a block to the backup destination. The default value for retry 10 times.
   <br/>
   <br>
</font>
  </li>
  <li><font color="black">
   com.ahsay.afc.io.ReadAheadInputStream.timeout
   <br/>
   <br/>
   The read timeout interval before AhsayOBM / ACB retry to send a block to the backup destination. The default timeout value is 90 minutes.
   <br/>
   <br>
   </font>
  </li>
  <li><font color="black">
   com.ahsay.afc.bfs.cloud.ChunkedOutputStream.upperSleepLimit
   <br/>
   <br/>
   The default maximum sleep interval value is 16 minutes.
   <br>
   <br>
   If the data block upload fails, then AhsayOBM / ACB will sleep for (30 sec) x 2 ^ (no. of retry - 1)  minutes and then try to re-upload the data block again, the maximum sleeping interval is 16 minutes (e.g. 960 seconds), for example 30 sec, 60 sec, 120 sec, 240 sec, 480 sec, 960 sec, 960 sec, 960 sec, 960 sec, 960 sec ... etc).
   </font>
  </li>
 </ul>

 On the AhsayOBM / ACB client computer:
 <br/>
 <br/>
 <ol>
  <li><font color="black">
   Browse to the ${OBC_Install_Home} folder.
  </li>
  <li>
   Edit the afc.opt file.
   </font>
  </li>
  <li><font color="black">
   Add the following values to the afc.opt file.
   <br/>
   <br/>
   <b>
    Recommended values:
   </b>
   <br/>
   com.ahsay.afc.bfs.cloud.ChunkedOutputStream.retry=20
   <br/>
   com.ahsay.afc.io.ReadAheadInputStream.timeout=300
   <br/>
   com.ahsay.afc.bfs.cloud.ChunkedOutputStream.upperSleepLimit=5
   <br/>
   <br>
  </li>
  <li><font color="black">
   Save the file</font>
  </li>
  <li><font color="black">
   Run the backup job again.</font>
  </li>
 </ol>
</html>


===== Keywords =====
Retry, timeout, network, sleep, network, ChunkedOutputStream.FlushData
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