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<h2 title="Class FileTxnLog" class="title">Class FileTxnLog</h2>
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<pre>public class <span class="typeNameLabel">FileTxnLog</span>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>
implements <a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html" title="interface in org.apache.zookeeper.server.persistence">TxnLog</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a></pre>
<div class="block">This class implements the TxnLog interface. It provides api's
to access the txnlogs and add entries to it.
<p>
The format of a Transactional log is as follows:
<blockquote><pre>
LogFile:
FileHeader TxnList ZeroPad
FileHeader: {
magic 4bytes (ZKLG)
version 4bytes
dbid 8bytes
}
TxnList:
Txn || Txn TxnList
Txn:
checksum Txnlen TxnHeader Record 0x42
checksum: 8bytes Adler32 is currently used
calculated across payload -- Txnlen, TxnHeader, Record and 0x42
Txnlen:
len 4bytes
TxnHeader: {
sessionid 8bytes
cxid 4bytes
zxid 8bytes
time 8bytes
type 4bytes
}
Record:
See Jute definition file for details on the various record types
ZeroPad:
0 padded to EOF (filled during preallocation stage)
</pre></blockquote></div>
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<td class="colFirst"><code>static class </code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileTxnLog.FileTxnIterator.html" title="class in org.apache.zookeeper.server.persistence">FileTxnLog.FileTxnIterator</a></span></code>
<div class="block">this class implements the txnlog iterator interface
which is used for reading the transaction logs</div>
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<h3>Nested classes/interfaces inherited from interface org.apache.zookeeper.server.persistence.<a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html" title="interface in org.apache.zookeeper.server.persistence">TxnLog</a></h3>
<code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.TxnIterator.html" title="interface in org.apache.zookeeper.server.persistence">TxnLog.TxnIterator</a></code></li>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileTxnLog.html#LOG_FILE_PREFIX">LOG_FILE_PREFIX</a></span></code> </td>
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileTxnLog.html#TXNLOG_MAGIC">TXNLOG_MAGIC</a></span></code> </td>
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<td class="colFirst"><code>static int</code></td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileTxnLog.html#FileTxnLog-java.io.File-">FileTxnLog</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a> logDir)</code>
<div class="block">constructor for FileTxnLog.</div>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileTxnLog.html#append-org.apache.zookeeper.txn.TxnHeader-org.apache.jute.Record-">append</a></span>(<a href="http://zookeeper.apache.org/zookeeper-jute/apidocs/org/apache/zookeeper/txn/TxnHeader.html?is-external=true" title="class or interface in org.apache.zookeeper.txn">TxnHeader</a> hdr,
<a href="http://zookeeper.apache.org/zookeeper-jute/apidocs/org/apache/jute/Record.html?is-external=true" title="class or interface in org.apache.jute">Record</a> txn)</code>
<div class="block">append an entry to the transaction log</div>
</td>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileTxnLog.html#append-org.apache.zookeeper.txn.TxnHeader-org.apache.jute.Record-org.apache.zookeeper.txn.TxnDigest-">append</a></span>(<a href="http://zookeeper.apache.org/zookeeper-jute/apidocs/org/apache/zookeeper/txn/TxnHeader.html?is-external=true" title="class or interface in org.apache.zookeeper.txn">TxnHeader</a> hdr,
<a href="http://zookeeper.apache.org/zookeeper-jute/apidocs/org/apache/jute/Record.html?is-external=true" title="class or interface in org.apache.jute">Record</a> txn,
<a href="http://zookeeper.apache.org/zookeeper-jute/apidocs/org/apache/zookeeper/txn/TxnDigest.html?is-external=true" title="class or interface in org.apache.zookeeper.txn">TxnDigest</a> digest)</code>
<div class="block">Append a request to the transaction log with a digset</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileTxnLog.html#close--">close</a></span>()</code>
<div class="block">close all the open file handles</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileTxnLog.html#commit--">commit</a></span>()</code>
<div class="block">commit the logs.</div>
</td>
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<tr id="i4" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileTxnLog.html#getCurrentLogSize--">getCurrentLogSize</a></span>()</code>
<div class="block">Return the current on-disk size of log size.</div>
</td>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileTxnLog.html#getDbId--">getDbId</a></span>()</code>
<div class="block">the dbid of this transaction database</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileTxnLog.html#getLastLoggedZxid--">getLastLoggedZxid</a></span>()</code>
<div class="block">get the last zxid that was logged in the transaction logs</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a>[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileTxnLog.html#getLogFiles-java.io.File:A-long-">getLogFiles</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a>[] logDirList,
long snapshotZxid)</code>
<div class="block">Find the log file that starts at, or just before, the snapshot.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileTxnLog.html#getTotalLogSize--">getTotalLogSize</a></span>()</code>
<div class="block">Gets the total size of all log files</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileTxnLog.html#getTxnLogSyncElapsedTime--">getTxnLogSyncElapsedTime</a></span>()</code> </td>
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<tr id="i10" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileTxnLog.html#isForceSync--">isForceSync</a></span>()</code>
<div class="block">the forceSync value.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/util/zip/Checksum.html?is-external=true" title="class or interface in java.util.zip">Checksum</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileTxnLog.html#makeChecksumAlgorithm--">makeChecksumAlgorithm</a></span>()</code>
<div class="block">creates a checksum algorithm to be used</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.TxnIterator.html" title="interface in org.apache.zookeeper.server.persistence">TxnLog.TxnIterator</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileTxnLog.html#read-long-">read</a></span>(long zxid)</code>
<div class="block">start reading all the transactions from the given zxid</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.TxnIterator.html" title="interface in org.apache.zookeeper.server.persistence">TxnLog.TxnIterator</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileTxnLog.html#read-long-boolean-">read</a></span>(long zxid,
boolean fastForward)</code>
<div class="block">start reading all the transactions from the given zxid.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileTxnLog.html#rollLog--">rollLog</a></span>()</code>
<div class="block">rollover the current log file to a new one.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileTxnLog.html#setPreallocSize-long-">setPreallocSize</a></span>(long size)</code>
<div class="block">method to allow setting preallocate size
of log file to pad the file.</div>
</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileTxnLog.html#setServerStats-org.apache.zookeeper.server.ServerStats-">setServerStats</a></span>(<a href="../../../../../org/apache/zookeeper/server/ServerStats.html" title="class in org.apache.zookeeper.server">ServerStats</a> serverStats)</code>
<div class="block">Setter for ServerStats to monitor fsync threshold exceed</div>
</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileTxnLog.html#setTotalLogSize-long-">setTotalLogSize</a></span>(long size)</code>
<div class="block">Sets the total size of all log files</div>
</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileTxnLog.html#setTxnLogSizeLimit-long-">setTxnLogSizeLimit</a></span>(long size)</code>
<div class="block">Set log size limit</div>
</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/persistence/FileTxnLog.html#truncate-long-">truncate</a></span>(long zxid)</code>
<div class="block">truncate the current transaction logs</div>
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<h3>Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<pre>public static final int TXNLOG_MAGIC</pre>
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<pre>public static final int VERSION</pre>
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<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../constant-values.html#org.apache.zookeeper.server.persistence.FileTxnLog.VERSION">Constant Field Values</a></dd>
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<pre>public static final <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> LOG_FILE_PREFIX</pre>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../constant-values.html#org.apache.zookeeper.server.persistence.FileTxnLog.LOG_FILE_PREFIX">Constant Field Values</a></dd>
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<pre>public FileTxnLog(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a> logDir)</pre>
<div class="block">constructor for FileTxnLog. Take the directory
where the txnlogs are stored</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>logDir</code> - the directory where the txnlogs are stored</dd>
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<pre>public static void setPreallocSize(long size)</pre>
<div class="block">method to allow setting preallocate size
of log file to pad the file.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>size</code> - the size to set to in bytes</dd>
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<pre>public void setServerStats(<a href="../../../../../org/apache/zookeeper/server/ServerStats.html" title="class in org.apache.zookeeper.server">ServerStats</a> serverStats)</pre>
<div class="block">Setter for ServerStats to monitor fsync threshold exceed</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html#setServerStats-org.apache.zookeeper.server.ServerStats-">setServerStats</a></code> in interface <code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html" title="interface in org.apache.zookeeper.server.persistence">TxnLog</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>serverStats</code> - used to update fsyncThresholdExceedCount</dd>
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<pre>public static void setTxnLogSizeLimit(long size)</pre>
<div class="block">Set log size limit</div>
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<pre>public long getCurrentLogSize()</pre>
<div class="block">Return the current on-disk size of log size. This will be accurate only
after commit() is called. Otherwise, unflushed txns may not be included.</div>
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<pre>public void setTotalLogSize(long size)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html#setTotalLogSize-long-">TxnLog</a></code></span></div>
<div class="block">Sets the total size of all log files</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html#setTotalLogSize-long-">setTotalLogSize</a></code> in interface <code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html" title="interface in org.apache.zookeeper.server.persistence">TxnLog</a></code></dd>
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<pre>public long getTotalLogSize()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html#getTotalLogSize--">TxnLog</a></code></span></div>
<div class="block">Gets the total size of all log files</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html#getTotalLogSize--">getTotalLogSize</a></code> in interface <code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html" title="interface in org.apache.zookeeper.server.persistence">TxnLog</a></code></dd>
</dl>
</li>
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<h4>makeChecksumAlgorithm</h4>
<pre>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/util/zip/Checksum.html?is-external=true" title="class or interface in java.util.zip">Checksum</a> makeChecksumAlgorithm()</pre>
<div class="block">creates a checksum algorithm to be used</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the checksum used for this txnlog</dd>
</dl>
</li>
</ul>
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<h4>rollLog</h4>
<pre>public void rollLog()
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">rollover the current log file to a new one.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html#rollLog--">rollLog</a></code> in interface <code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html" title="interface in org.apache.zookeeper.server.persistence">TxnLog</a></code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
</dl>
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<h4>close</h4>
<pre>public void close()
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">close all the open file handles</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true#close--" title="class or interface in java.io">close</a></code> in interface <code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a></code></dd>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true#close--" title="class or interface in java.lang">close</a></code> in interface <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a></code></dd>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html#close--">close</a></code> in interface <code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html" title="interface in org.apache.zookeeper.server.persistence">TxnLog</a></code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
</dl>
</li>
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<h4>append</h4>
<pre>public boolean append(<a href="http://zookeeper.apache.org/zookeeper-jute/apidocs/org/apache/zookeeper/txn/TxnHeader.html?is-external=true" title="class or interface in org.apache.zookeeper.txn">TxnHeader</a> hdr,
<a href="http://zookeeper.apache.org/zookeeper-jute/apidocs/org/apache/jute/Record.html?is-external=true" title="class or interface in org.apache.jute">Record</a> txn)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">append an entry to the transaction log</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html#append-org.apache.zookeeper.txn.TxnHeader-org.apache.jute.Record-">append</a></code> in interface <code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html" title="interface in org.apache.zookeeper.server.persistence">TxnLog</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>hdr</code> - the header of the transaction</dd>
<dd><code>txn</code> - the transaction part of the entry
returns true iff something appended, otw false</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true iff something appended, otw false</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
</dl>
</li>
</ul>
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<pre>public boolean append(<a href="http://zookeeper.apache.org/zookeeper-jute/apidocs/org/apache/zookeeper/txn/TxnHeader.html?is-external=true" title="class or interface in org.apache.zookeeper.txn">TxnHeader</a> hdr,
<a href="http://zookeeper.apache.org/zookeeper-jute/apidocs/org/apache/jute/Record.html?is-external=true" title="class or interface in org.apache.jute">Record</a> txn,
<a href="http://zookeeper.apache.org/zookeeper-jute/apidocs/org/apache/zookeeper/txn/TxnDigest.html?is-external=true" title="class or interface in org.apache.zookeeper.txn">TxnDigest</a> digest)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html#append-org.apache.zookeeper.txn.TxnHeader-org.apache.jute.Record-org.apache.zookeeper.txn.TxnDigest-">TxnLog</a></code></span></div>
<div class="block">Append a request to the transaction log with a digset</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html#append-org.apache.zookeeper.txn.TxnHeader-org.apache.jute.Record-org.apache.zookeeper.txn.TxnDigest-">append</a></code> in interface <code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html" title="interface in org.apache.zookeeper.server.persistence">TxnLog</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>hdr</code> - the transaction header</dd>
<dd><code>txn</code> - the transaction itself</dd>
<dd><code>digest</code> - transaction digest
returns true iff something appended, otw false</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>getLogFiles</h4>
<pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a>[] getLogFiles(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a>[] logDirList,
long snapshotZxid)</pre>
<div class="block">Find the log file that starts at, or just before, the snapshot. Return
this and all subsequent logs. Results are ordered by zxid of file,
ascending order.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>logDirList</code> - array of files</dd>
<dd><code>snapshotZxid</code> - return files at, or before this zxid</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>log files that starts at, or just before, the snapshot and subsequent ones</dd>
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<pre>public long getLastLoggedZxid()</pre>
<div class="block">get the last zxid that was logged in the transaction logs</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html#getLastLoggedZxid--">getLastLoggedZxid</a></code> in interface <code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html" title="interface in org.apache.zookeeper.server.persistence">TxnLog</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the last zxid logged in the transaction logs</dd>
</dl>
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<h4>commit</h4>
<pre>public void commit()
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">commit the logs. make sure that everything hits the
disk</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html#commit--">commit</a></code> in interface <code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html" title="interface in org.apache.zookeeper.server.persistence">TxnLog</a></code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<pre>public long getTxnLogSyncElapsedTime()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html#getTxnLogSyncElapsedTime--">getTxnLogSyncElapsedTime</a></code> in interface <code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html" title="interface in org.apache.zookeeper.server.persistence">TxnLog</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>elapsed sync time of transaction log in milliseconds</dd>
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<h4>read</h4>
<pre>public <a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.TxnIterator.html" title="interface in org.apache.zookeeper.server.persistence">TxnLog.TxnIterator</a> read(long zxid)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">start reading all the transactions from the given zxid</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html#read-long-">read</a></code> in interface <code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html" title="interface in org.apache.zookeeper.server.persistence">TxnLog</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>zxid</code> - the zxid to start reading transactions from</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>returns an iterator to iterate through the transaction
logs</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>read</h4>
<pre>public <a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.TxnIterator.html" title="interface in org.apache.zookeeper.server.persistence">TxnLog.TxnIterator</a> read(long zxid,
boolean fastForward)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">start reading all the transactions from the given zxid.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>zxid</code> - the zxid to start reading transactions from</dd>
<dd><code>fastForward</code> - true if the iterator should be fast forwarded to point
to the txn of a given zxid, else the iterator will point to the
starting txn of a txnlog that may contain txn of a given zxid</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>returns an iterator to iterate through the transaction logs</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>truncate</h4>
<pre>public boolean truncate(long zxid)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">truncate the current transaction logs</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html#truncate-long-">truncate</a></code> in interface <code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html" title="interface in org.apache.zookeeper.server.persistence">TxnLog</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>zxid</code> - the zxid to truncate the logs to</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if successful false if not</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>getDbId</h4>
<pre>public long getDbId()
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">the dbid of this transaction database</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html#getDbId--">getDbId</a></code> in interface <code><a href="../../../../../org/apache/zookeeper/server/persistence/TxnLog.html" title="interface in org.apache.zookeeper.server.persistence">TxnLog</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the dbid of this database</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>isForceSync</h4>
<pre>public boolean isForceSync()</pre>
<div class="block">the forceSync value. true if forceSync is enabled, false otherwise.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the forceSync value</dd>
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