Bitmap index including internal metadata storage

An apparatus comprising:

• a processor;
• and
• a memory storing instructions executable by the processor to perform operations comprising:
• receiving a first signal;
• updating a bitmap index responsive to the first signal, wherein the bitmap index is distributed across a plurality of storage devices, and wherein the bitmap index includes a plurality of bit strings, wherein a value stored in a particular location in each of the bit strings indicates whether a corresponding signal associated with a signal source has been received, and wherein updating the bitmap index responsive to the first signal includes updating a first bit of the bitmap index and updating a first metadata value stored in the bitmap index;
• receiving a second signal;
• and
• updating the bitmap index responsive to the second signal, wherein
• updating the bitmap index responsive to the second signal includes updating a second bit of the bitmap index and updating a second metadata value stored in the bitmap index.

A computer-readable storage device storing instructions that,

• when executed, cause a computer to perform operations comprising:
• receiving a first signal;
• updating a bitmap index responsive to the first signal, wherein the bitmap index is distributed across a plurality of storage devices, and wherein the bitmap index includes a plurality of bit strings, wherein a value stored in a particular location in each of the bit strings indicates whether a corresponding signal associated with a signal source has been received, and wherein updating the bitmap index responsive to the first signal includes updating a first bit of the bitmap index and updating a first metadata value stored in the bitmap index;
• receiving a second signal;
• and
• updating the bitmap index responsive to the second signal, wherein updating the bitmap index responsive to the second signal includes updating a second bit of the bitmap index and updating a second metadata value stored in the bitmap index.